Schweitzer Engineering Laboratories SEL-749M Instruction Manual
  1. Manuals
  2. Brands
  3. Schweitzer Engineering Laboratories Manuals
  4. Relays
  5. SEL-749M
  6. Instruction manual

Schweitzer Engineering Laboratories SEL-749M Instruction Manual

Motor protection relay
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
SEL-749M
Motor Protection Relay
Instruction Manual
20080918
*PM749M-01-NB*
Courtesy of NationalSwitchgear.com

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the SEL-749M and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Schweitzer Engineering Laboratories SEL-749M

Summary of Contents for Schweitzer Engineering Laboratories SEL-749M

  • Page 1 SEL-749M Motor Protection Relay Instruction Manual 20080918 *PM749M-01-NB* Courtesy of NationalSwitchgear.com...
  • Page 2 SEL products appearing in this document may be covered by US and Foreign patents. Schweitzer Engineering Laboratories, Inc. reserves all rights and benefits afforded under federal and international copyright and patent laws in its products, including without limitation software, firmware, and documentation.

  • Page 3: Table Of Contents

    Global Settings (SET G Command) ......................4.40 Port Settings (SET P Command)........................4.41 Front-Panel Set (SET F Command) ......................4.42 Report Settings (SET R Command) ......................4.44 Logic Functions ............................. 4.45 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 4 Section 6: Settings Overview ................................. 6.1 View/Change Settings Using the Front Panel....................6.2 View/Change Settings With Serial Port......................6.4 Setting Entry Error Messages.......................... 6.5 SEL-749M Settings Sheets Section 7: Communications Overview ................................. 7.1 Communications Interfaces ..........................7.1 Communications Protocol ..........................7.5 SEL ASCII Protocol Details..........................
  • Page 5 Motor Running Protection..........................F.7 Interpreting Percent Thermal Capacity Values....................F.9 Thermal Element Trip-Time Equations......................F.9 Appendix G: Relay Word Bits Overview ................................ G.1 Definitions ..............................G.2 Glossary Index SEL-749M Relay Command Summary Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 6 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 7: List Of Tables

    List of Tables Table 1.1 SEL-749M Serial Port Settings ....................1.6 R.Ins truction Manual Table 2.1 Slot Allocations for Different Cards ..................2.2 Table 2.2 Communications Ports ......................2.3 Table 2.3 Communications Card Interfaces and Connectors ..............2.4 Table 2.4 Voltage Card Terminal Designation ..................
  • Page 8 SER Trigger Settings......................4.44 Table 4.49 Event Report Settings......................4.44 Table 4.50 Motor Start Report Setting ....................4.45 Table 4.51 SEL-749M Logic Inputs and Outputs .................. 4.45 Table 4.52 Operator Precedence ......................4.50 Table 5.1 Measured Values ........................5.2 Table 5.2 Thermal Meter Values ......................
  • Page 9 Communications Processor METER Region Map..............C.8 Table C.9 Communications Processor TARGET Region ...............C.9 Table D.1 Modbus Query Fields ......................D.1 Table D.2 SEL-749M Modbus Function Codes..................D.2 Table D.3 SEL-749M Modbus Exception Codes................... D.2 Table D.4 03h Read Holding Register Command.................. D.3 Table D.5 Responses to 03h Read Holding Register Query Errors ............
  • Page 10 7Eh NOP Command......................D.9 Table D.23 Modbus Register Map ......................D.11 Table G.1 SEL-749M Relay Word Bits ....................G.1 Table G.2 Relay Word Bit Definitions for the SEL-749M ..............G.2 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 11 Power Factor Elements Logic ....................4.28 Figure 4.18 Loss-of-Potential (LOP) Logic..................... 4.29 Figure 4.19 Over- and Underfrequency Element Logic ................4.30 Figure 4.20 Stop/Trip Logic ........................4.34 Figure 4.21 Thermal Element Lockout Logic ..................4.35 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 12 Enhancing Multidrop Networks With SEL Communications Processors......C.6 Figure C.4 Example of SEL Relay and SEL Communications Processor Configuration......C.7 Figure E.1 SEL-749M Motor Relay Back Panel View With DeviceNet ..........E.1 Figure E.2 DeviceNet Card Component Overview ..................E.2 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 13 Motor Running Thermal Element With Resistance and Trip Level Undefined ..... F.7 Figure F.6 Calculating the Normal Operating Energy by Using Locked Rotor Trip Times....F.7 Figure F.7 Motor Running Thermal Element ..................F.8 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 14 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 15: Preface

    Preface R.Ins truction Manual Manual Overview The SEL-749M Relay Instruction Manual describes common aspects of motor relay application and use. It includes the necessary information to install, set, test, and operate the relay. An overview of each manual section and topics follows: Preface.

  • Page 16: Conventions

    Examples This instruction manual uses several example illustrations and instructions to explain how to effectively operate the SEL-749M. These examples are for demonstration purposes only; the firmware identification information or settings values included in these examples may not necessarily match those in the current version of your SEL-749M.

  • Page 17: Safety And General Information

    Symbol 5 Earth (Ground) Terminal Hazardous Locations The SEL-749M complies with UL 1604, CSA 22.2 No. 213 and EN 60079-15. In North America, the relay is approved for Class 1, Division 2, Approvals Groups A, B, C, D, and T4 in the –40° to +70°C temperature range.
  • Page 18 UL/CSA Safety Rating Relative humidity 5 to 95% Main supply voltage fluctuations Up to ±10% of nominal voltage Overvoltage Category II Pollution Degree 2 Atmospheric pressure 80 to 110 kPa SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 19 Instructions for Use a mild soap or detergent solution and a damp cloth to carefully clean the SEL-749M chassis when necessary. Avoid using abrasive materials, polishing Cleaning and compounds, and harsh chemical solvents (such as xylene or acetone) on any Decontamination surface of the relay.
  • Page 20 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 21: Overview

    Voltage-based and RTD-based protection are available as options. All relay models provide monitoring functions. This manual contains the information needed to install, set, test, operate, and maintain any SEL-749M. It is not necessary to review the entire manual to perform specific tasks. Features ➤...
  • Page 22 Introduction and Specifications Features Optional The SEL-749M has the following optional protection features: Protection Features ➤ PTC Overtemperature (49) (positive temperature coefficient switching thermistor) ➤ Voltage-Based Protection ➢ Undervoltage (27) ➢ Overvoltage (59) ➢ Underpower (37) ➢ Reactive Overpower ➢...

  • Page 23: Models, Options, And Accessories

    Models, Options, and Accessories Models Complete ordering information is not provided in this instruction manual. See the latest SEL-749M Model Option Table at www.selinc.com, under SEL Literature, Ordering Information (Model Option Tables). Base Model The SEL-749M base model has the following features: ➤...

  • Page 24: Applications

    ➢ Without retaining screws (Part #915900010) ➢ With retaining screws (Part #915900014) ➤ For information on additional SEL-749M mounting accessories, including adapter plates, go to www.selinc.com/ Mounting Accessories/. Applications Section 2: Installation includes ac and dc connection diagrams for various applications.

  • Page 25: Getting Started

    Understanding basic relay operation principles and methods will help you use the SEL-749M effectively. This section presents the fundamental knowledge you need to operate the SEL-749M, organized by task. These tasks help you become familiar with the relay and include the following: ➤...

  • Page 26: Table 1.1 Sel-749M Serial Port Settings

    Time: 10:31:43.797 Station 1 Figure 1.1 Response Header Checking Use the STA serial port command to view the SEL-749M operational status. Analog channel dc offset and monitored component status are listed in the Relay Status status report depicted in Figure 1.2.
  • Page 27 DAT (Date Command) Viewing the Date Type DAT <Enter> at the prompt to view the date stored in the SEL-749M. If the date stored in the relay is July 29, 2003 and the DATE_F setting is MDY, the relay will reply:...
  • Page 28 OUT103 is Form C Trip Output, all other outputs are Form A. Electrical Durability Break φ Dielectric Test Voltage: 2000 Vac VA Rating: 360 VA, Impulse Withstand Voltage (U 4000 V Mechanical Durability: 10,000 no load operations SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 29 Surge Immunity: IEC 61000-4-5:1995 + A1:2001 [BS EN Dimensions 61000-4-5:1995 + A1:1996] 2 kV line-to-line Refer to Figure 2.1 for relay dimensions. 4 kV line-to-earth Weight 2.0 kg (4.4 lbs) Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 30 NOTE: FLA is a setting (see the Main Settings (SET Command) of the Product Specific: EN 50263:1999 [BS EN 50263:2000], SEL-749M Settings Sheets at the end of Section 6 for setting ranges). IEC 60947-4-1:2002 [BS EN 60947-4- PTC Overtemperature (49)
  • Page 31 ±5% of setting ±2 V 250 V secondary unless otherwise noted. NOTE: VNOM is a setting (see the Main Settings (SET Command) Motor Phase Currents: ±2% of reading, ±2° SEL-749M Settings Sheets at the end of Section 6 for setting ranges). 3-Phase Average Motor Current: ±2% of reading...
  • Page 32 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 33: Section 2: Installation

    Section 2 Installation Instruction Manual Overview The first steps in applying the SEL-749M Relay are installing and connecting the relay. This section describes common installation features and requirements. To install and connect the relay safely and effectively, you must be familiar with relay configuration features and options.

  • Page 34: I/O Configuration

    Your SEL-749M offers flexibility in tailoring I/O to your specific application. In total, the SEL-749M has six rear-panel slots, labeled as Slots A, B, C, D, E, and Z. Slots A, B, and Z are base unit slots, each associated with a specific function.

  • Page 35: Table 2.2 Communications Ports

    NOTE: When either a current or following selection. voltage signal is available, the SEL-749M tracks the frequency Power Supply and I/O (2 inputs, 3 outputs) Card. Supported in Slot A. (maximum slew rate of 9 Hz), and samples 16 times a cycle at the See the model option table at www.selinc.com for power supply and input...

  • Page 36: Table 2.3 Communications Card Interfaces And Connectors

    5 A phase CTs on one card. However, the phase CTs and the neutral CT can be of different current rating. You can order one of two neutral CT ratings, 1 A or 5 A. With a current card installed, the SEL-749M tracks the frequency (using positive-sequence current) and samples at 16 times a cycle—see...

  • Page 37: Table 2.5 Current Card Terminal Designation

    (you still have to program the I/O using the SET command). Following a change in configuration, the relay is always disabled until you accept the new relay configuration. To change the configuration, perform the following steps. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 38 Step 13. Attach the terminal marking label (provided with the card) to the top panel so that the INTERFACE CARD EXPANSION SLOT is covered. Step 14. Reconnect all connection plugs, and add any additional wiring/ connectors required by the new option card. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 39: Rear-Panel Connections

    Communications Card (EIA-232/ EIA-485) Card 6: Main Board with IRIG-B and EIA-232 Rear Port Card 7: Main Board with PTC and EIA-232 Rear Port Figure 2.2 Rear-Panel Connections of Card Options Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 40: Figure 2.3 Ptc Input, Eia-232/Eia-485 Communications Card, 3 Di/4 Do/1 Ao Card, And Voltage Card Options

    Installation Rear-Panel Connections Rear-Panel and Top- The physical layout of the connectors on the rear-panel and top-panel diagrams of three sample configurations of the SEL-749M are shown in Panel Diagrams Figure 2.3, Figure 2.4, and Figure 2.5. (A) Rear-Panel Layout...

  • Page 41: Figure 2.4 Irig-B Input, Devicenet Card, 3 Di / 4 Do/1 Ao Card, And Voltage Card Options

    Rear-Panel Connections (A) Rear-Panel Layout i4156a (B) Top-Panel Input and Output Designations i4153a Figure 2.4 IRIG-B Input, DeviceNet Card, 3 DI /4 DO/ 1 AO Card, and Voltage Card Options Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 42: Figure 2.5 Irig-B Input, 8 Di Card, 3 Di /4 Do / 1 Ao Card, And Voltage Card Options

    (A) Rear-Panel Layout i4154a (B) Top-Panel Input and Output Designations i4151a Figure 2.5 IRIG-B Input, 8 DI Card, 3 DI /4 DO / 1 AO Card, and Voltage Card Options SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 43 For compliance with IEC 60947-1 and IEC 60947-3, place a suitable external switch or circuit breaker in the POWER leads for the SEL-749M; this device should interrupt both the hot (H) and neutral (N) power leads. The maximum...

  • Page 44: Table 2.8 Ptc Cable Requirements

    I/O Diagram A more functional representation of the control (I/O) connections for a typical SEL-749M configuration with the 3 DI/4 DO /1 AO card option is shown in 2.6. Additional I/O options include the 8 DI card for Slot C.

  • Page 45: Ac/Dc Control Connection Diagrams

    ➤ The relay coil is energized continuously if the SEL-749M is powered and operational. ➤ When the SEL-749M generates a trip signal, the relay coil is de-energized. ➤ The relay coil is also de-energized if the SEL-749M power supply voltage is removed or if the SEL-749M fails (self-test status is FAIL).

  • Page 46: Figure 2.8 Out103 Contact Fail-Safe And Nonfail-Safe Options

    Contactor STOP OUT102 := START START Fail-Safe (electrically held) OUT103FS := Y OUT103 := TRIP Contactor Coil Figure 2.9 Contactor Application Using Factory Default Settings SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 47: Figure 2.10 Voltage Connections

    F1, F2, and F3 are fuses SEL-749M Wye-Wye VT Connection SEL-749M Open-Delta VT Connection SEL-749M Figure 2.10 Voltage Connections Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 48: Figure 2.11 Ac Connections With Core-Balance Ct

    AC/DC Control Connection Diagrams Across the Line Starting SEL-749M CBT core-balance current transformer The current transformers and the SEL-749M chassis must be grounded in the relay cabinet. Figure 2.11 AC Connections With Core-Balance CT The implementation in Figure 2.12 requires the following settings:...

  • Page 49: Figure 2.13 Ac Connections For Star-Delta Starting

    Figure 2.13 AC Connections for Star-Delta Starting CR1, CR2, & CR3 = Contactor STOP = Indicator (contactor closed) = Indicator START (relay alarm) SEL-749M OUT103 OUT101 (ALARM) —/N Delta Figure 2.14 Control Connections for Star-Delta Starting Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 50: Figure 2.15 Ac Connections For A Two-Speed Motor-Paralleled Cts

    Speed1 or Speed2. The following setting is required. SPEED2 := IN101 LA LB LC LN Speed 1 Windings Speed 2 Windings SEL-749M —/N Figure 2.15 AC Connections for a Two-Speed Motor-Paralleled CTs SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 51: Field Serviceability

    Installation 2.19 Field Serviceability Field Serviceability The SEL-749M firmware may be upgraded in the field; refer to Appendix B: CAUTION Firmware Upgrade Instructions for firmware upgrade instructions. You may Equipment components are sensitive know when a self-test failure has occurred by configuring an output contact to to electrostatic discharge (ESD).
  • Page 52 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 53: Section 3: Pc Software

    SEL-5601 Software ASCII event report files to oscillography SEL-5801 SEL-5801 Cable Selector Software Selects the proper SEL cables for your application This section describes how to get started with the SEL-749M and ® QuickSet SEL-5030 software. QuickSet is a ERATOR ERATOR powerful setting, event analysis, and measurement tool that aids in setting, applying, and using the SEL-749M.

  • Page 54: Setup

    Communications QuickSet uses communications Port 3, Port 4, or Port F ERATOR relay (front panel) to communicate with the SEL-749M. Perform the following steps to configure QuickSet to communicate effectively with ERATOR the relay. Step 1. Select Communications from the...

  • Page 55: Terminal

    PC Software Terminal Step 4. Configure QuickSet to match the SEL-749M ERATOR default settings by entering Access Level 1 and Access Level 2 passwords in the respective text boxes. Step 5. If a telephone modem is chosen from the text box, enter relay the dial-up telephone number in the Phone Number text box.

  • Page 56: Settings Database Management And Drivers

    Database Manager; these databases are useful for grouping similar protection schemes or geographic areas. Step 2. Click the Open B option button to open a database. relay SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 57: Settings

    QuickSet makes setting the relay easy and ERATOR efficient. However, you do not have to use QuickSet to ERATOR configure the SEL-749M; you can use an ASCII terminal or a computer running terminal emulation software. QuickSet provides the ERATOR OGIC ®...

  • Page 58: Table 3.3 File/Tools Menus

    FID string to create a particular version of settings. To get started making SEL-749M settings with the Settings Editor in the Editor Mode, select File > New from the main menu bar, and SEL-749M and 003 from the Settings Editor Selection window as shown in Figure 3.5.

  • Page 59: Figure 3.6 Update Part Number

    Z number in the FID string (select Tools > Meter & Control > Status). These numbers must match. QuickSet uses this first portion of the Z ERATOR number to determine the correct Settings Editor to display. Z Number Figure 3.7 New Setting Screen Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 60 SEL control equation variables. OGIC Access the Expression Builder Use the Ellipsis buttons in the Settings dialog boxes of Settings Editor windows to create expressions, as shown in Figure 3.8. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 61: Figure 3.8 Expressions Created With Expression Builder

    Directly underneath the right side of the equation, choose operators to include in the RVALUE. These operators include basic logic, rising- and falling-edge triggers, expression compares, and comments. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 62: Event Analysis

    QuickSet has integrated analysis tools that help you retrieve ERATOR information about relay operations quickly and easily. Use the event information that the SEL-749M stores to evaluate the performance of a system (select Tools > Events > Get Event Files). Figure 3.9 shows composite screens for retrieving events.

  • Page 63: Meter And Control

    3.11. The HMI tree view shows all the functions available from the HMI function. Unlike the self-configuration of the device, the HMI tree remains the same regardless of the type of cards installed. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 64: Figure 3.11 Device Overview Screen

    The front-panel LEDs display the status of the 8 front-panel LEDs. Use the front-panel settings to change the front-panel LED assignment. Figure 3.11 Device Overview Screen The Fundamental, Thermal, etc., screens display the corresponding values. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 65: Figure 3.12 Control Screen

    Figure 3.12 Control Screen To control the Remote bits, click on the appropriate square, then select the operation from the box shown in Figure 3.13. Figure 3.13 Remote Operation Selection Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 66: Available Help

    Help Types Description General QuickSet Select Help from the main menu bar ERATOR SEL-749M Settings Select Settings Help from the Help menu bar while the Settings Editor is open. Database Manager Select Help from the bottom of the Database Manager window...

  • Page 67: Section 4: Protection And Logic Functions

    Protection and Logic Functions Instruction Manual Overview This section describes the SEL-749M Relay settings, including the motor protection elements and basic functions, control I/O logic, as well as the settings that control the communications ports and front-panel displays. Section 6: Settings for settings hide rules and settings interdependency checks.

  • Page 68: Application Data

    Protocol), or the DeviceNet™ port (see Appendix E: DeviceNet). Application Data It is faster and easier for you to calculate settings for the SEL-749M if you collect the following information before you begin (collect the information for each speed for a two-speed motor application): ➤...

  • Page 69: Main Settings (Set Command)

    UNIT ID LINE 2 16 Characters TID := MOTOR RELAY The SEL-749M prints the Relay and Terminal Identifier strings at the top of responses to serial port commands to identify messages from individual relays. Enter up to 16 characters, including capital letters A–Z, numbers 0–9, periods (.), dashes (-), and spaces.

  • Page 70: Basic Motor Protection

    ➤ Repeated or Frequent Starting The Thermal Method setting (SETMETH) selects the thermal element algorithm that will be used in the SEL-749M. The Thermal Method setting offers the following two options: Rating Thermal Method. When selected, the relay configures a thermal...

  • Page 71: Table 4.4 Overload (Thermal Model) Settings

    0.833 to determine a hot locked rotor time that is acceptable for most motors. EXAMPLE 4.3 Thermal Element Setting A 4000 V, 600 HP motor is protected by the SEL-749M Thermal Overload Element. The motor data sheet includes the following NOTE: The SEL-749M normally uses information.

  • Page 72: Figure 4.1 Thermal Overload Limits (Rating Method)

    Protection and Logic Functions Basic Motor Protection Phase current transformers with 100:5 A rating are selected for the application. The SEL-749M settings for the application are calculated as shown below: Current Transformer Ratio: CTR1 := 100/5 := 20 (see Main Settings...
  • Page 73 EXAMPLE 4.5 Thermal Element Curve Method Setting A 4160 V, 800 HP motor is to be protected through use of the SEL-749M Thermal Element Curve Method. The motor data sheet includes the following information. Rated Horsepower (HP) = 800 HP Rated Voltage (V) = 4160 V Rated Full Load Current (A) = 101.0 A...

  • Page 74: Table 4.5 Thermal Limit Tripping Times In Seconds Vs. Multiples Of Full-Load Amps (Service Factor = 1.01)

    Protection and Logic Functions Basic Motor Protection Phase current transformers having 150:5 ratios are selected for the application. The SEL-749M settings for the application are shown below. Current Transformer Ratio (CTR) = 150/5 = 30 Full Load Amps (FLA) = 101 A primary Service Factor (SF) = 1.15...

  • Page 75: Table 4.6 Overload Settings (Alarm, Start Inhibit, Cooling, And Rtd Bias)

    The available thermal capacity required to start is (100–TCSTART), where TCSTART is the start inhibit level setting. This feature can be disabled by setting TCSTART equal to OFF. ≥ TCSTART Start%TCU Equation 4.2 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 76: Table 4.7 Phase Overcurrent Settings

    0.00–5.00 sec 50P2D := 0.50 If the SEL-749M is connected to a motor protected by a fused contactor, disable the phase overcurrent element by setting its trip level to OFF. If the relay is connected to a device capable of interrupting fault current, use the element to detect and trip for phase overcurrent faults.

  • Page 77: Table 4.8 Neutral Overcurrent Settings

    Calculate the trip and warn level settings based on the available ground fault current and the core balance CT ratio. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 78: Figure 4.3 Overcurrent Element Logic

    The resistor is sized to limit the current to 10 A primary. The three motor leads are passed through the window of a 10:1 core balance CT. The CT secondary is connected to the SEL-749M IN current input, as shown in Figure 4.4.

  • Page 79: Table 4.9 Residual Overcurrent Settings

    Set the jam trip level greater than the expected normal load current but less than the rated locked rotor current. This setting is entered in per unit of the full load amps (FLA) setting. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 80: Table 4.11 Undercurrent Settings

    Load Loss Start Delay Setting RUNNING = Motor Is Running LLADLY = Load Loss Alarm Delay Setting LOSSTRIP = Load Loss Trip LOSSALRM = Load Loss Alarm Figure 4.6 Undercurrent (Load-Loss) Logic SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 81: Table 4.12 Current Imbalance Settings

    The SEL-749M calculates percent imbalance current in one of two ways, depending on the magnitude of the average current. When the average current, Iav, is greater than the motor-rated full load current, the relay calculates the...

  • Page 82: Table 4.13 Protection Disable Settings

    You can disable trip and warning levels of preselected protection elements for a set time delay during motor starting. Set the protection inhibit time setting NOTE: The SEL-749M determines (PROTBL_T) for the time you want to disable undercurrent, phase the motor state (Starting, Running, or overcurrent, current imbalance, ground fault, and undervoltage elements.

  • Page 83: Table 4.15 Star-Delta Settings

    STAR_MAX := OFF NOTE: In addition to enabling the Star-Delta, you must assign Star and Delta to Auxiliary output relays (one The SEL-749M issues the command to switch from Star to Delta (Wye to each); see Table 4.37, and Figure 2.14 Delta) as soon as the starting current has dropped to the rated value and the for typical connection diagrams.

  • Page 84: Table 4.17 Phase Reversal Setting

    Y, N E47T := Y The SEL-749M uses phase currents or phase voltages (if available) to determine that the phase rotation of signals applied to the relay matches the phase rotation setting, PHROT. When you set E47T equal to Y, the relay trips 0.5 seconds after incorrect phase rotation signals are applied to the relay.

  • Page 85: Figure 4.9 Phase Reversal Element Logic

    I1, V1 and I2, V2 indicate positive-sequence and negative-sequence quantities. FLA min = Lowest Full Load Current Setting Allowed |IB| |IC| 0.25 • FLA min 0.5 • |I2| |I1| Figure 4.9 Phase Reversal Element Logic Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 86: Ptc/Rtd-Based Protection

    Setting Name := Factory Default PTC ENABLE Y, N EPTC := N You can connect up to six thermistors detectors (PTC) to the SEL-749M. The NOTE: In addition to enabling the detectors are typically embedded in the stator winding of the motor, and they PTC function, you must also connect monitor the actual temperature of the winding.
  • Page 87 Resistance to sensors Figure 4.12 Characteristic of PTC Sensors as per IEC 34-11-2 RTD Input Function When you connect an SEL-2600 RTD module, the SEL-749M offers several protection and monitoring functions, settings for which are described in Table 4.20. See Figure 2.4...
  • Page 88 120-ohm nickel (NI120) ➤ 10-ohm copper (CU10) RTD Trip/Warning Levels The SEL-749M provides temperature warnings and trips through use of the RTD temperature measurements and the warning and trip temperature settings Table 4.20. The relay issues a winding temperature warning if any of the healthy winding RTDs (RTD location setting equals WDG) indicate a temperature greater than the relay RTD warning temperature setting.
  • Page 89 NEMA standards suggest a 1°C reduction in RTD trip temperature for each 1°C rise in ambient temperature over 40°C. When you enable RTD biasing, the SEL-749M automatically reduces the RTD trip temperatures for all winding RTDs when ambient temperature is above 40°C.

  • Page 90: Voltage-Based Protection

    OV WARN DELAY 0.0–120.0 sec 59P2D := 5.0 NOTE: The under- and overvoltage When you connect the SEL-749M voltage inputs to phase-to-phase connected level settings are in per unit nominal VTs, as in Figure 2.10, the relay provides two levels of phase-to-phase voltage, Vnm.

  • Page 91: Figure 4.13 Undervoltage Element Logic

    When DELTA_Y := DELTA 59P1D 59P1P • Vnm 59P1T 59P1P 59P2D 59P2P • Vnm 59P2T 59P2P 59P1P, 59P2P = Settings Vnm = Effective Nominal Voltage Figure 4.14 Overvoltage Element Logic Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 92: Table 4.24 Underpower Settings

    Off, 1–25000 kW 37PTP := OFF UP TRIP DELAY 0–240 sec 37PTD := 1 UP WARN LEVEL Off, 1–25000 kW 37PAP := OFF UP WARN DELAY 0–240 sec 37PAD := 1 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 93: Table 4.25 Power Factor Settings

    Refer to Figure 5.3 for the relay power measurement convention. For application on an induction motor, disable the elements by setting all four power factor level settings to OFF. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 94: Figure 4.17 Power Factor Elements Logic

    LOP logic accurately determines that this loss of input voltages is a loss- of-potential condition and does not trip (if the LOP Relay Word bit supervises SEL-749M Relay Instruction Manual Date Code 20080918...

  • Page 95: Figure 4.18 Loss-Of-Potential (Lop) Logic

    Note: I is 1 A or 5 A depending on the part number. I is the phase secondary input rating. VNOM and PTR are settings. Figure 4.18 Loss-of-Potential (LOP) Logic Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 96: Frequency And Load Control Settings

    0.0–240.0 sec 81D2AD := 1.0 NOTE: The relay measures system The SEL-749M provides two warning and two trip over- or underfrequency frequency for these elements with the elements with independent level and time-delay settings. When an element positive-sequence voltage if the...

  • Page 97: I/O Configuration

    MAX_I, %THERM, WDG_RTD, BRG_RTD, PWR_kW, The SEL-749M provides a 4–20 mA dc analog current output with a variety of output parameters. Use the analog output select setting (AOPARM) to select the desired parameter from the list of available options. Table 4.29 shows description and scaling of the output for different parameter selections.

  • Page 98: Table 4.29 Scaling Of Analog Output

    SHORT CIRCUIT Y, N BLK50P := N UNDERCURRENT Y, N BLK37 := N START INHIBIT Y, N BLK66 := N Y, N BLK49PTC := N Y, N BLK49RTD := N SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 99: Table 4.31 Trip And Close Logic Settings

    52A := NOT IN101 NOTE: The factory-default The SEL-749M tripping logic is designed to trip or stop motors energized assignment of the Relay Word bit TRIP through circuit breakers or contactors. The relay logic lets you define the is the output OUT103. See Table 4.37...

  • Page 100: Figure 4.20 Stop/Trip Logic

    STOP serial port command) are maintained for at least the duration of the minimum trip duration time (TDURD) setting. TR TRIP CONDITIONS SEL EQUATION OGIC The SEL-749M Trip Logic offers two ways to stop the protected motor: ➤ Conditions mapped to TR. ➤...

  • Page 101: Figure 4.21 Thermal Element Lockout Logic

    (49T is a Thermal Trip Relay Word bit). Figure 4.21 Thermal Element Lockout Logic If any of the above protection functions is not enabled by the relay settings, that function does not affect trip unlatch. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 102: Table 4.32 Motor Control Settings

    / indicates reset on rising edge of the Reset input. 50S, 52A are Relay Word bits. Figure 4.22 Motor State Logic Motor Control The Motor Control settings interface the SEL-749M for external start control and motor speed control. Table 4.32 lists these SEL...

  • Page 103: Figure 4.23 Start Logic

    SPEED2 OGIC and SPEEDSW. When SPEED2 control input is asserted and the two-speed enable setting E2SPEED is Y (see Table 4.2) the SEL-749M selects second values for the settings shown in Table 4.33. See Table 4.2 Table 4.4 full description of various settings.

  • Page 104: Logic Settings (Set L Command)

    Logic Functions on page 4.45 explains the settings and operation of the logic control equation. OGIC input/output and the SEL control equations of the SEL-749M. OGIC Enables OGIC Table 4.34 SEL Enable Settings OGIC...

  • Page 105: Table 4.37 Control Output Equations And Contact Behavior Settings

    OUT404 FAIL-SAFE Y, N OUT404FS := N OUT404 OUT404 := 0 The SEL-749M provides the ability to use SEL control equations to map OGIC protection (trip and warning) and general-purpose control elements to the outputs. In addition, you can enable fail-safe output contact operation for relay contacts on an individual basis.

  • Page 106: Global Settings (Set G Command)

    Relay Word bit DSABLSET is asserted. You can assign a contact input (e.g., DSABLSET := IN402) if you want to disable setting changes from the front panel. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 107: Port Settings (Set P Command)

    Protection and Logic Functions 4.41 Port Settings (SET P Command) Port Settings (SET P Command) The SEL-749M provides settings that allow you to configure the parameters for the communications ports. See Section 7: Communications for a detailed description. The front-panel Serial Port F and the rear Port 3 consist of EIA-232.

  • Page 108: Front-Panel Set (Set F Command)

    Set FASTOP := N to block binary Fast Operate messages. Refer to Appendix C: SEL Communications Processors for the description of the SEL-749M Fast Operate commands. Use the Port 4 factory default settings to establish communications when the DeviceNet card is used.

  • Page 109: Table 4.46 Display Enable Settings

    27P1T) OR 59P1T TRIP LATCH T_LED Y, N T06LEDL := Y LED6 EQUATION T06_LED := 81D1T OR 81D2T The SEL-749M settings T01_LED through T06_LED control the six front- panel LEDs (see Figure 8.1 Figure 8.7 for the programmable LED locations).

  • Page 110: Report Settings (Set R Command)

    LER setting. For LER of 15, the prefault length, PRE, must be in the range the LER setting, You must save the 1–10. The relay can hold twenty three 15-cycle event reports or seven 64- data before changing the setting. cycle event reports. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 111: Logic Functions

    Latch Control Switches ➤ Control Equation Variables/Timers OGIC ➤ Output Contacts Introduction Table 4.51 describes all of the logic input/output of the SEL-749M. Table 4.51 SEL-749M Logic Inputs and Outputs Description Setting Optoisolated inputs IN101–IN102 Optoisolated inputs (Optional) IN401–IN403 Optoisolated inputs (Optional) IN301–IN308...

  • Page 112: Figure 4.25 Example Operation Of Optoisolated Inputs In101-In102

    The outputs of the remote control switches in Figure 4.27 are Relay Word bits RBn (n = 1 to 8), called remote bits. Use these remote bits in SEL control OGIC equations. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 113: Figure 4.27 Remote Control Switches Drive Remote Bits Rb1-Rb8

    The CON 3 command and PRB 3 subcommand place Remote Control Switch 3 into the MOMENTARY position for one processing interval, regardless of the initial state of the switch. Remote Control Switch 3 is then placed in the OFF position. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 114: Figure 4.28 Traditional Latching Relay

    Latch control switches (latch bits are the outputs of these switches) replace traditional latching relays. Traditional latching relays maintain output contact state. The SEL-749M latch control switches also retain state even when power to the relay is lost. If the latch control switch is set to a programmable output contact and power to the relay is lost, the state of the latch control switch is stored in nonvolatile memory, but the relay de-energizes the output contact.
  • Page 115 If you use any optoisolated inputs in settings SETn and RSTn, the inputs each have a separate debounce timer that can help in providing the necessary time qualification. Control The SEL-749M has eight (8) SEL control equation variables/timers. Each OGIC OGIC...

  • Page 116: Table 4.52 Operator Precedence

    Operator Precedence When you combine several operators and operands within a single expression, the SEL-749M evaluates the operators from left to right, starting with the highest precedence operators and working down to the lowest precedence. This means that if you write an equation with three AND operators, for example SV01 AND SV02 AND SV03, each AND will be evaluated from the left to the right.

  • Page 117: Figure 4.32 Factory Default Contact Output Out101 Operation

    Relay Word bit SALARM and/or HALARM assert to logical 1 when the relay detects an alarm condition. In addition, when the relay enters Access Level 2, the SALARM Relay Word bit momentarily asserts to logical 1. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 118 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 119: Section 5: Metering And Monitoring

    DeviceNet port. Also helpful in preventive maintenance tasks, the SEL-749M calculates and stores motor starting information. The relay retains motor start reports for the five latest motor starts.

  • Page 120: Table 5.1 Measured Values

    All Models Motor Load (xFLA) Thermal Capacity Used % Time to Trip (sec) Time to Reset (min) Starts Available With External SEL-2600 RTD module All RTD Temperatures RTD % Thermal Capacity SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 121: Table 5.3 Rtd Input Status Messages

    Thermal Capacity Used (%) 55.0 RTD % Thermal Capacity Used (%) Thermal Trip In (sec) 9999 Time to Reset (min) Starts Available =>> Figure 5.2 METER T Command Report With RTDs Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 122: Power Measurement Conventions

    VAR = – VAR = – PF = LAG PF = LEAD Figure 5.3 Complex Power Measurement Conventions—Motor Action In the SEL-749M, reported positive real power is always into the motor. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 123: Motor Operating Statistics

    Metering and Monitoring Motor Operating Statistics Motor Operating Statistics The SEL-749M retains useful machine operating statistics information for the protected motor. Use the serial port MOTOR command and the front-panel menu to MONITOR NOTE: While the relay power is off, view motor operating statistics.

  • Page 124: Motor Start Report

    Motor Start Report Motor Start Report The SEL-749M records motor start data for each motor start. The relay stores the five latest motor start reports in nonvolatile memory. View any of the five latest motor start reports using the serial port MSR n command, where n = 1–...

  • Page 125: Motor Start Trending

    All the trend data collected each day are added to nonvolatile memory at midnight. If the relay power is removed, the information collected between midnight and power removal is lost. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 126: Figure 5.6 Motor Start Trending Report Example

    MOTOR RELAY Time Source: internal Began Number Start Start Record Time %TCU Start I Start V Number Date Starts 11/17/2003 1079 4113 =>> Figure 5.6 Motor Start Trending Report Example SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 127: Section 6: Settings

    Section 6 Settings Instruction Manual Overview The SEL-749M Relay stores settings you enter in nonvolatile memory. Settings are divided into the following six setting classes: 1. Group 2. Logic 3. Global 4. Port p (where p = F, 3, or 4) 5.

  • Page 128: View/Change Settings Using The Front Panel

    Select and enter the appropriate command by pushing the {Enter} pushbutton. Select to save the settings changes and to discard the changes. NOTE: Each SEL-749M is shipped Figure 6.1 shows a front-panel menu navigation example for the relay to enter with default factory settings. Calculate the MOTOR FLA, FLA1 setting.

  • Page 129: Figure 6.1 Front-Panel Setting Entry Example

    Main Settings Menu SEL-749M • • • FLA1 250.0 A • • • DELTA_Y DELTA PHASE ROTATION Menu MOTOR FLA FLA1 = 0250.0 A Figure 6.1 Front-Panel Setting Entry Example Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 130: View/Change Settings With Serial Port

    When you issue the SET command, the relay presents a list of settings one at a time. Enter a new setting or press <Enter> to accept the existing setting. Editing keystrokes are listed in Table 6.4. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 131: Setting Entry Error Messages

    If any of these checks fail, the relay issues one of the error messages shown in Table 6.6, and returns you to the settings list for a correction. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 132: Table 6.6 Setting Interdependency Error Messages

    PTR Setting Out of Range Main Settings Modify VNOM or PTR setting to satisfy: 100 ≤ (VNOM/PTR) ≤ 250 for DELTA_Y := DELTA 100 ≤ (VNOM/PTR) ≤ 440 for DELTA_Y := WYE SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 133: Sel-749M Settings Sheets

    SEL-749M Settings Sheets Instruction Manual These settings sheets include the definition and input range for each setting in the relay. You can access the settings ERATOR ® from the relay front panel and the serial ports. For factory default settings see the SEL-5030 Software.
  • Page 134 SET.2 of 16 SEL-749M Settings Sheets Date _______________ Main Settings (SET Command) Group______________ MOTOR LRA-2nd (2.5–12.0 xFLA) LRA2 := _____________________ (Hidden if E2SPEED := N or SETMETH := CURVE) MOTOR LRT-2nd (1.0–600.0 sec) LRTHOT2 := _____________________ (Hidden if E2SPEED := N or SETMETH := CURVE) ACCEL FACT-2nd (0.10–1.50)
  • Page 135 SET.3 of 16 SEL-749M Settings Sheets Date _______________ Main Settings (SET Command) Group______________ Undercurrent UC TRIP LEVEL (Off, 0.10–1.00 xFLA) LLTPU := _____________________ UC TRIP DELAY (0.4–120.0 sec) LLTDLY := _____________________ (Hidden if LLTPU := Off) UC WARN LEVEL (Off, 0.10–1.00 xFLA)
  • Page 136 SET.4 of 16 SEL-749M Settings Sheets Date _______________ Main Settings (SET Command) Group______________ RTD ENABLE (Y, N) E49RTD := _____________________ (All of the following RTD settings are hidden if E49RTD := N) RTD1 LOCATION (Off, WDG, BRG, AMB, OTH) RTD1LOC := _____________________...
  • Page 137 SET.5 of 16 SEL-749M Settings Sheets Date _______________ Main Settings (SET Command) Group______________ RTD6 WARN LEVEL (Off, 1–250°C) ALTMP6 (Hidden if RTD6LOC := Off)F RTD7 LOCATION (Off, WDG, BRG, AMB, OTH) RTD7LOC := _____________________ RTD7 TYPE (PT100, NI100, NI120, CU10)
  • Page 138 SET.6 of 16 SEL-749M Settings Sheets Date _______________ Main Settings (SET Command) Group______________ RTD12 WARN LEVEL (Off, 1–250°C) ALTMP12 := _____________________ (Hidden if RTD12LOC := Off) WIND TRIP VOTING (Y, N) EWDGV := _____________________ (Hidden if less than 2 locations are WDG)
  • Page 139 SET.7 of 16 SEL-749M Settings Sheets Date _______________ Main Settings (SET Command) Group______________ Power Factor (Hidden if voltages not included) PF LAG TRIP LEVEL (Off, 0.05–0.99) 55LGTP := _____________________ PF LD TRIP LEVEL (Off, 0.05–0.99) 55LDTP := _____________________ PF TRIP DELAY (0–240 sec)
  • Page 140 SET.8 of 16 SEL-749M Settings Sheets Date _______________ Main Settings (SET Command) Group______________ Trip Inhibit BLOCK PROTECTION (SV) BLKPROT := ______________________________________________________________________ CURRENT IMBALANC (Y, N) BLK46 := _____________________ JAM (Y, N) BLK48 := _____________________ GROUND FAULT (Y, N) BLK50EF := _____________________...
  • Page 141 SET.9 of 16 SEL-749M Settings Sheets Date _______________ Logic Settings (SET L Command) Group______________ Logic Settings (SET L Command) Enables OGIC LATCHES (N, 1–8) ELAT := _____________________ OGIC SV/TIMERS (N, 1–8) := _____________________ Latch Bits Equations SET01 (SV) (Hidden if ELAT := N)
  • Page 142 SET.10 of 16 SEL-749M Settings Sheets Date _______________ Logic Settings (SET L Command) Group______________ SV/Timers SV TIMER PICKUP (0.00–3000.00 sec) SV01PU := _____________________ (Hidden if ESV := N) SV TIMER DROPOUT (0.00–3000.00 sec) SV01DO := _____________________ (Hidden if ESV := N)
  • Page 143 SET.11 of 16 SEL-749M Settings Sheets Date _______________ Logic Settings (SET L Command) Group______________ SV TIMER PICKUP (0.00–3000.00 sec) SV08PU := _____________________ (Hidden if ESV := N or < 8) SV TIMER DROPOUT (0.00–3000.00 sec) SV08DO := _____________________ (Hidden if ESV := N or < 8)
  • Page 144 SET.12 of 16 SEL-749M Settings Sheets Date _______________ Global Settings (SET G Command) Group______________ Global Settings (SET G Command) General PHASE ROTATION (ABC, ACB) PHROT RATED FREQ. (50, 60 Hz) FNOM := _____________________ DATE FORMAT (MDY, YMD, DMY) DATE_F := _____________________...
  • Page 145 SET.13 of 16 SEL-749M Settings Sheets Date _______________ SET P F, SET P 3, or SET P 4 Commands Group______________ SET P F, SET P 3, or SET P 4 Commands Port F SPEED (300–38400 bps) SPEED := _____________________ DATA BITS (7, 8 bits)
  • Page 146 SET.14 of 16 SEL-749M Settings Sheets Date _______________ SET P F, SET P 3, or SET P 4 Commands Group______________ NOTE: Port 4 has the following additional settings when DeviceNet card is used. These settings can be viewed by using either the STA serial port...
  • Page 147 SET.15 of 16 SEL-749M Settings Sheets Date _______________ Front-Panel Settings (SET F Command) Group______________ Front-Panel Settings (SET F Command) General LCD TIMEOUT (Off, 1–30 min) FP_TO := _____________________ LCD CONTRAST (1–8) FP_CONT := _____________________ Display Enable TIME & DATE (Y, N)
  • Page 148 SET.16 of 16 SEL-749M Settings Sheets Date _______________ Report Settings (SET R Command) Group______________ Report Settings (SET R Command) SER Trigger Lists SERn = Up to 24 Relay Word elements separated by spaces or commas. Use NA to disable setting.

  • Page 149: Section 7: Communications

    The remainder of the section describes the ASCII commands used with the EIA-232 serial port(s). Communications Interfaces The SEL-749M physical interfaces are shown in Table 7.1. Several optional SEL devices are available to provide alternative physical interfaces, including EIA-485 and fiber-optic cable.
  • Page 150 Port power can provide as much as 0.5 A total from all of the +5 Vdc pins. Some SEL communications devices require the +5 Vdc power supply. Connect Your The front port of the SEL-749M is a standard female 9-pin connector with pin numbering shown in Figure 7.1.

  • Page 151: Table 7.2 Eia-232/Eia-485 Serial Port Pin Functions

    For EIA-485, the pin numbers represent relay terminals CO1 through C05. The following cable diagrams show several types of EIA-232 serial communications cables that connect the SEL-749M to other devices. These and other cables are available from SEL. Contact the factory for more information.

  • Page 152: Figure 7.3 Sel Cable C227A-Sel-749M To Dte Device

    9-Pin Male 9-Pin Male D Subconnector D Subconnector Pin # Pin # Func. Func. Figure 7.5 SEL Cable C272A. SEL-749M to SEL Communications Processor (Without IRIG-B Signal) SEL Communications Processor SEL-749M Relay 9-Pin Male 9-Pin Male D Subconnector D Subconnector Func.

  • Page 153: Communications Protocol

    Communications Communications Protocol EIA-485 Two-Wire Modbus RTU protocol is available on EIA-485 Port 4A (requires optional communications card). Connect the SEL-749M relay EIA-485 port (Port 4A) Communications to a two-wire Modbus network as shown in Figure 7.7. SEL-749M Relay 120 Ω Characteristic...

  • Page 154: Sel Ascii Protocol Details

    The protocol is described in Appendix C: SEL Communications Processors. Modbus RTU Protocol The SEL-749M provides Modbus RTU support at Port 3 or Port 4, but not concurrently. Modbus is described in Appendix D: Modbus RTU Communications Protocol.

  • Page 155: Table 7.4 Serial Port Automatic Messages

    (Relay Self-Test Status) on page U.7.24. Access Levels Commands can be issued to the SEL-749M via the serial port to view metering values, change relay settings, etc. The available serial port commands are listed in the SEL-749M Relay Command Summary at the end of this manual.
  • Page 156 The ACC command takes the SEL-749M to Access Level 1. See Access Commands (ACCESS and 2ACCESS) on page U.7.10 for more detail. Access Level 1 When the SEL-749M is in Access Level 1, the relay sends the following prompt: => See the SEL-749M Relay Command Summary at the end of this manual for the commands available from Access Level 1.

  • Page 157: Table 7.5 Command Response Header

    (settings, metering, etc.), not changing it. ➤ The Access Level 2 commands are primarily for changing relay settings. The SEL-749M responds with when a command is Invalid Access Level entered from an access level lower than the specified access level for the command.

  • Page 158: Table 7.6 Access Commands

    The ACC and 2AC commands provide entry to the multiple access levels. Different commands are available at the different access levels, as shown in SEL-749M Relay Command Summary at the end of this manual. Commands ACC and 2AC are explained together because they operate similarly.

  • Page 159: Table 7.8 Analog Command Format

    4–20 mA, the command ANA 75 5.5 instructs the relay to output 16 mA (75% of full scale) for 5.5 minutes or until any character or space key is pressed to end the test. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 160: Table 7.9 Bnames Command

    #D represents a data format line corresponding to maximum # number of subsequent data lines Format fields are of the following types: I Integer data mS String of maximum m characters SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 161: Table 7.11 Cevent Command (Compressed Event Report)

    <STX>"FID","yyyy"<CR> "FID=SEL-RlyType-Rrrr-V0-Zzzzzzz-Ddddddddd","yyyy"<CR> "REC_NUM","MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC","EVENT", "CURR","TARGETS","yyyy"<CR> xxxx,xxxx,xxxx,xxxx,xxxx,xxxx,xxxx,xxxx,"xxxxxxxxxxxxxxxx",xxxx,"xxxxxxxx","yyyy"<C R> <ETX> (the last line is then repeated for each record) If the history buffer is empty, the relay displays the following: <STX>"No Data Available","0668"<CR><ETX> Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 162: Table 7.15 Control Command

    Command Description Access Level CON n First step of a two-command sequence. The SEL-749M will prompt for the second step (subcommand), shown below. Parameter n is a number from 1 to 8 representing RB1–RB8. Table 7.16 CONTROL Subcommands Subcommand Description...

  • Page 163: Table 7.21 Event Command (Event Reports)

    The FIL command provides a safe and efficient means of transferring files between intelligent electronic devices (IEDs) and external support software (ESS). Use the FIL commands for sending settings to the SEL-749M and receiving settings from the relay. Date Code 20080918...

  • Page 164: Table 7.24 History Command

    To force the relay to synchronize to IRIG-B, enter the following command: =>IRI <Enter> If the relay successfully synchronizes to IRIG, it sends the following header and access level prompt: SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 165: Table 7.27 L_D Command (Load Firmware)

    To view the instantaneous meter values once, use the MET command (see the example in Figure 5.1). To view the meter values k times, use the MET k command, where k is a number between 1 and 32767. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 166: Table 7.29 Meter T (Thermal And Rtd Metering)

    Section 5: Metering and Monitoring includes additional details on the motor operating statistics report. Issuing the MOT R or MOT C command from Access Level 2 clears the report. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 167: Table 7.31 Msr (Motor Start Report) Command

    PAS level Display the password for the Access Level level. Table 7.34 PAS Command Format Parameter Description level Parameter level represents the relay Access Levels 1 or 2. new-password New password. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 168: Table 7.35 Factory Default Passwords For Access Levels 1 And 2

    Level 1. QUIT Command Use the QUIT command to revert to Access Level 0. Table 7.37 QUIT Command Command Description Access Level Go to Access Level 0. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 169: Table 7.38 R_S Command (Restore Factory Defaults)

    Communications 7.21 SEL ASCII Protocol Details Access Level 0 is the lowest access level; the SEL-749M performs no password check to descend to this level (or to remain at this level). R_S Command (Restore Factory Defaults) Use the R_S command to restore factory default settings.

  • Page 170: Table 7.41 Set Command (Change Settings)

    The relay is disabled for as long as five seconds while it saves the new settings. The SALARM Relay Word bit is set momentarily, and the ENABLED LED extinguishes while the relay is disabled. SEL-749M Relay Instruction Manual Date Code 20080918...

  • Page 171: Table 7.44 Show Command (Show/View Settings)

    Append s, the name of the specific setting you want to view and jumps to this setting. If s is not entered, the relay starts at the first setting. =>SHO <Enter> := SEL-749M := MOTOR RELAY CTR1 := 100 FLA1 := 250.0...

  • Page 172: Table 7.46 Sns Command

    STATUS Report Message Definition Designator Format Firmware identifier string (FID string) Firmware checksum identifier xxxx Current Offset DC offset in hardware circuits of current OK/WARN (L1, L2, L3, RES, CB) channels SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 173: Figure 7.9 Status Command Example

    Time Source: internal FID=SEL-749M-R100-V0-Z001001-D20031210 CID=FB1C Part Number 0749M01B612X1C11 SELF TESTS Current Offset: Voltage Offset: PS_Vdc FPGA GPSB CR_RAM Non_Vol Clk_Bat Clock Current Voltage I/O_Crd Relay Enabled =>> Figure 7.9 STATUS Command Example Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 174: Table 7.49 Stop Command

    The n parameter with the SUM n command can have a value up to 5 and defines the number of events requested. If n is not specified, then up to five of the most recent reports are listed. SEL-749M Relay Instruction Manual Date Code 20080918...

  • Page 175: Table 7.52 Target Command (Display Relay Word Bit Status)

    Bits. The TAR command does not remap the front-panel target LEDs, as is done in some previous SEL relays. Table 7.54 Front-Panel LEDs and the TAR 0 Command LEDs TAR 0 ENABLED TRIP TLED_01 TLED_02 TLED_03 TLED_04 TLED_05 TLED_06 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 176: Table 7.55 Time Command (View/Change Time)

    If you enter an invalid time, the SEL-749M responds, Invalid Time TRIGGER Command (Trigger Event Report) Use the TRI command to trigger the SEL-749M to record data for high- resolution oscillography and event reports. Table 7.56 TRIGGER Command (Trigger Event Report)

  • Page 177: Section 8: Front-Panel Operations

    (LCD). Front-panel targets and other LED indicators give a quick look at SEL-749M operation status. The features that help you operate the relay from the front panel include the following: ➤...

  • Page 178: Human-Machine Interface

    You can adjust the LCD screen contrast to suit your viewing angle and lighting conditions. To change screen contrast, press and hold the {ESC} pushbutton for two seconds. The SEL-749M displays a contrast adjustment NOTE: See the Preface for an explanation of typographic box.

  • Page 179: Figure 8.2 Access Level Security Padlock Symbol

    Human-Machine Interface Front-Panel Security Front-Panel Access Levels The SEL-749M front panel typically operates at Access Level 1 and provides viewing of relay measurements and settings. Some activities, such as editing settings and controlling output contacts, are restricted to those operators who know the Access Level 2 passwords or can disable these passwords from the front panel.

  • Page 180: Table 8.2 Front-Panel Pushbutton Functions

    Front-Panel Menus and Screens Navigating the Menus The SEL-749M front panel gives you access to most of the information that the relay measures and stores. You can also use front-panel controls to view or modify relay settings. All of the front-panel functions are accessible through use of the six-button keypad and LCD display.

  • Page 181: Figure 8.5 Sel-749M Front-Panel Menu Structure (Continued)

    Arrow} pushbuttons to suspend automatic scrolling and enable manual scrolling of this information. SEL-749M Menu Structure Figure 8.5 describes the menu hierarchy. Menus and displays are available for most SEL-749M functions. Several of these menus and displays are described in detail later in this section. MAIN METER Meter...
  • Page 182 PORT Front-Panel Port F Access Lvl Reset Port F Menu Port 3 PORT F Port 4 SPEED BITS PARITY ••• • • • etc. Figure 8.5 SEL-749M Front-Panel Menu Structure SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 183 50P2P=1 access. Use the {Up Arrow} or {Down Arrow} to navigate to any of the Relay Word bits in the selected row. Control Menu The SEL-749M provides great flexibility in control through the < MAIN menu. Use the front-panel menu for the following control...

  • Page 184: Figure 8.6 Relay Heading Example

    Use the menu item to test Output Contacts Output Contacts SEL-749M output contacts and associated circuits. You can pulse the selected Relay Word bit associated with the contact outputs from this menu (see Figure 4.32 for a typical output logic).

  • Page 185: Operation And Target Leds

    1. The reset is confirmed by the display message Access Lvl Reset Operation and Target LEDs Programmable LEDs The SEL-749M provides quick confirmation of relay conditions via operation and target LEDs. Figure 8.7 shows this region with factory default text on the front-panel configurable labels.

  • Page 186: Table 8.3 Possible Warning Conditions (Flashing Trip Led)

    Pushbutton TARGET RESET For a trip event, the SEL-749M latches the trip-involved target LEDs except for the ENABLED LED. Press the {TARGET RESET} pushbutton to reset the latched target LEDs. When a new trip event occurs and the previously latched trip targets have not been reset, the relay clears the latched targets and displays the new trip targets.
  • Page 187 Programming specific conditions in the SEL control OGIC equation RSTTRGT is another method for resetting target LEDs. Access RSTTRGT in the Global settings (Data Reset Control). See Table 4.39 further information. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 188 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 189: Section 9: Analyzing Events

    Analyzing Events Instruction Manual Overview The SEL-749M Relay provides several tools (listed below) to analyze the cause of relay operations. Use these tools to help diagnose the cause of the relay operation and more quickly restore the protected motor to service.

  • Page 190: Event Reporting

    LER and PRE settings. Changing the PRE setting has no effect on the stored reports. Triggering The SEL-749M triggers (generates) an event report when any of the following occur: ➤ Relay Word bit TRIP asserts ➤...
  • Page 191 SET R in Table 7.41). When setting ER detects a logical 0 to logical 1 transition, it generates an event report (if the SEL-749M is not already generating a report that encompasses the new transition). The factory setting is shown in Table 4.49.

  • Page 192: Table 9.1 Event Types

    (WDGTRIP OR BRGTRIP OR AMBTRIP OR OTHTRIP) AND TRIP PTC Trip PTCTRIP AND TRIP Start Trip Time SMTRIP AND TRIP Remote Trip REMTRIP AND TRIP Undervolt Trip 27P1T AND TRIP RTD Fail Trip RTDFLT AND TRIP SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 193 See Figure 9.2 for a sample event history. Use this report to view the events that are presently stored in the SEL-749M. The event history contains the following: ➤ Standard report header ➢...

  • Page 194: Figure 9.2 Sample Event History

    HIS command. Use the front-panel menu to display event MAIN > Events > Display Events history data on the SEL-749M front-panel display. Use the QuickSet software to retrieve the relay event history. ERATOR View the Relay Event History dialog box via the Analysis > Get Event Files…menu.

  • Page 195: Table 9.2 Event Report Current And Voltage Columns

    Event Reporting Filtered and Unfiltered Event Reports The SEL-749M samples the power system measurands (ac voltage and ac current) 16 times per power system cycle. A digital filter extracts the fundamental frequency component of the measurands. The relay operates on the filtered values and reports these values in the standard, filtered event report.

  • Page 196: Table 9.3 Output, Input, And Protection, And Control Element Event Report Columns

    OUT403 AND NOT OUT404 NOT OUT403 AND OUT404 OUT403 AND OUT404 Note that the ac values change from plus to minus (–) values in Figure 9.3, indicating the sinusoidal nature of the waveforms. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 197 If the trigger row ( ) and the > maximum phase current row ( ) are the same row, the symbol takes precedence, as is the case in Figure 9.3. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 198 -1 -3346 R ..1..1.. .3.. -1141.0 92.7 -18.0 -0.0-1066.3 -4176 -1 -2564 R ..1..1.. .3.. -962.0 -35.7 97.3 -0.0 -900.3 -599 3346 R ..1..1.. .3.. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 199: Figure 9.3 Example Standard 15-Cycle Event Report 1/4-Cycle Resolution

    100.0 0.04 1051.2 VOLTAGE MAG L-L (V) 4217 4215 4263 Winding Bearing Ambient Other Hottest RTD(C): := SEL-749M := MOTOR RELAY CTR1 := 100 FLA1 := 250.0 E2SPEED := N CTRN := 100 := 35.00 VNOM := 4160 DELTA_Y := DELTA...

  • Page 200: Figure 9.4 Derivation Of Event Report Current Values And Rms Current Values From Sampled Current Waveform

    Values From Sampled Current Waveform Figure 9.4, note that any two rows of current data from the event report in Figure 9.3, 1/4 cycle apart, can be used to calculate rms current values. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 201: Figure 9.5 Derivation Of Phasor Rms Current Values From Event Report Current Values

    The present sample (IA = 1135 A) is a real rms current value that relates to the phasor rms current value 1493 A • cos 40.5° – 1135 A Equation 9.2 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 202: Sequential Events Recorder (Ser) Report

    OUT103 asserts as a result of 50P1T asserting. IN101 asserts to indicate the circuit breaker or contactor has opened; however, because the motor currents are not cleared, this event indicates a starter fault clearing failure. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 203: Section 10: Testing And Troubleshooting

    ➤ Tests performed periodically once the relay is in service. This section provides information on both types of testing for the SEL-749M Relay. Because the SEL-749M is equipped with extensive self-tests, traditional periodic test procedures may be eliminated or greatly reduced.

  • Page 204: Table 10.1 Resultant Scale Factors For Inputs

    Section 8: Front-Panel Operations. Low-Level Test The SEL-749M has a low-level test interface on the current and voltage input printed circuit boards. You can test the relay in either of two ways: Interface conventionally, by applying ac signals to the relay inputs or by applying low magnitude ac voltage signals to the test interface on the printed circuit boards.

  • Page 205: Commissioning Tests

    The following procedure is a guideline to help you enter settings into the SEL-749M and to verify that it is properly connected. Modify the procedure as necessary to conform to your standard practices. Use this procedure at initial relay installation;...
  • Page 206 CTR1 settings and the fact that the quantities are displayed in primary units. Step 15. If you are using a core balance current transformer, apply a single-phase current (A-Phase) to the IN terminals. Do not apply voltage. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 207: Figure 10.2 Three-Phase Wye Ac Connections

    For each output contact, set the input to Logic 1. This causes the output contact to close. For example, setting OUT101 := 1 causes the output OUT101 contact to close. b. Repeat the process for all contact outputs. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 208: Table 10.2 Serial Port Commands That Clear Relay Data Buffers

    Phase voltage magnitudes should be nearly equal. ➢ Phase voltage phase angles should be balanced and have proper phase rotation. The SEL-749M is now ready for continuous service. Functional Tests Phase Current Measuring Accuracy Step 1. Connect the current source to the relay, as shown in Figure 10.4.

  • Page 209: Table 10.3 Phase Current Measuring Accuracy

    Step 3. Set the phase current angles to apply balanced three-phase currents in accordance with the PHROT setting. Refer to Figure 10.2. Step 4. Apply the appropriate magnitude for each phase current, as shown in Column 1 of Table 10.4. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 210: Table 10.4 Current Unbalance Measuring Accuracy

    Table 10.5. Values are given for PHROT := ABC and PHROT := ACB. Step 5. Use the front-panel function or the serial port MET METER command to verify the results. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 211: Table 10.5 Power Quantity Accuracy-Wye Voltages

    Step 4. Apply the current and voltage quantities shown in Column 1 of Table 10.6. Values are given for PHROT := ABC and PHROT := ACB. Step 5. Use the front-panel or the serial port MET command to METER verify the results. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 212: Periodic Tests (Routine Maintenance)

    Such reviews frequently reveal problems with equipment external to the relay, such as instrument transformers and control wiring. The SEL-749M does not require specific routine tests, but your operation standards may require some degree of periodic relay verification. If you need or want to perform periodic relay verification, the following checks are recommended.

  • Page 213: Self-Test

    10.11 Self-Test Self-Test The SEL-749M runs a variety of self-tests. Two Relay Word bits, HALARM and SALARM, signal self-test problems. SALARM is pulsed for software- programmed conditions; these include settings changes, access level changes, and three consecutive unsuccessful password entry attempts. HALARM is pulsed for hardware self-test warnings.
  • Page 214 RTD module reports open RTDs, shorted RTDs, a power supply failure Back-plane Fail if GPSB is busy on entry Latched Status Fail comms diagnostics to processing interval GPSB Failure SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 215: Troubleshooting

    Factory Assistance We appreciate your interest in SEL products and services. If you have questions or comments, please contact us at: Schweitzer Engineering Laboratories, Inc. 2350 NE Hopkins Court Pullman, WA 99163-5603 USA Phone: +1.509.332.1890 Fax: +1.509.332.7990...
  • Page 216 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 217: Table A.1 Firmware Revision History

    Firmware and Manual Versions Instruction Manual Firmware Determining the To find the firmware version number in your SEL-749M Relay, use the STA command (see STATUS Command (Relay Self-Test Status) on page 7.25 Firmware Version more information on the STA command). The firmware revision number is in Your Relay after the R, and the release date is after the D.

  • Page 218: Appendix A: Firmware And Manual Versions Firmware

    ➤ Added “Time to Reset” for lockout timer in Modbus map (register 011B) and Meter T report. ➤ Corrected timing for Curve method Starting element 20040216 SEL-749M-R101-V0-Z001001-D20040216 ➤ Original Firmware Release SEL-749M-R100-V0-Z001001-D20031210 20031219 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 219: Instruction Manual

    ➤ Revised and updated for addition of 8 DI card option. Section 2 ➤ Revised and added I/O Configuration subsection, including 8 DI card option. Section 3 ➤ Revised for the newly added SEL-749M HMI feature in the QuickSet Software. ERATOR Section 4 ➤...
  • Page 220 ➤ Made grammatical edits for clarity on pages 5.6, 5.7, and 5.9. Section 9 ➤ Made grammatical edits for clarity on pages 9.4, 9.6, and 9.8. Appendix A ➤ Updated for firmware version R101. 20031219 Initial Release. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 221: Appendix B: Firmware Upgrade Instructions

    Overview SEL occasionally offers firmware upgrades to improve the performance of your relay. Because the SEL-749M Relay stores firmware in flash memory, changing physical components is not necessary. Upgrade the relay firmware by downloading a file from a personal computer to the relay via the front- panel serial port as outlined in the following sections.

  • Page 222: Figure B.1 Firmware File Transfer Process

    , use the following procedure to restore the factory Failure default settings: a. Set the communications software settings to 9600 baud, 8 data bits, and 1 stop bit. b. Enter Access Level 2 by issuing the 2AC command. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 223 Processor and the SEL relay. Failure to perform this step can result in automatic data collection failure when cycling communications processor power. The relay is now ready for your commissioning procedure. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 224 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 225: Table C.1 Supported Serial Command Sets

    Appendix C SEL Communications Processors Instruction Manual SEL Communications Protocols The SEL-749M Relay supports SEL protocols and command sets shown in Table C.1. Table C.1 Supported Serial Command Sets Command Set Description SEL ASCII Use this protocol to send ASCII commands and receive ASCII responses that are human readable with an appropriate terminal emulation program.

  • Page 226: Appendix C: Sel Communications Processors Sel Communications Protocols

    Note that XON, XOFF, and CAN operations operate on only the ASCII data stream. An example of using these interleaved data streams is when the SEL-749M communicates with an SEL communications processor. These SEL communications processors perform autoconfiguration by using a single data stream and SEL Compressed ASCII and binary messages.

  • Page 227: Sel Communications Processor

    In this multitiered system, the lower-tier SEL communications processors forward data to the upper-tier SEL communications processor that serves as the central point of access to substation data and substation IEDs. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 228: Table C.3 Sel Communications Processors Protocol Interfaces

    FTP (File Transfer Protocol) FTP clients Telnet Telnet servers and clients UCA2 GOMSFE UCA2 protocol masters UCA2 GOOSE UCA2 protocol and peers Requires SEL-2711 Modbus Plus protocol card. Requires SEL-2701 Ethernet Processor. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 229: Sel Communications Processor And Relay Architecture

    SEL communications processors equipped with an SEL-2701 Ethernet Processor can provide a UCA2 interface to SEL-749M relays and other serial IEDs. The SEL-749M data appear in models in a virtual device domain. The combination of the SEL-2701 with an SEL communications processor offers a significant cost savings because you can use existing IEDs or purchase less expensive IEDs.

  • Page 230: Figure C.3 Enhancing Multidrop Networks With Sel Communications Processors

    SCADA Engineering Ethernet LAN Ethernet LAN Modem SEL Communications Processor EIA-232 SEL-421 Relay Ethernet IED SEL-749M Relay SEL Relay Non-SEL IED Figure C.3 Enhancing Multidrop Networks With SEL Communications Processors SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 231: Sel Communications Processor Example

    SEL Communications Processors SEL Communications Processor Example SEL Communications Processor Example This example demonstrates the data and control points available in the SEL communications processor when you connect an SEL-749M. The physical configuration used in this example is shown in Figure C.4.

  • Page 232: Table C.6 Sel Communications Processor Port 1 Automatic Messaging Settings

    No USER region registers reserved Table C.7 shows the map of regions in the SEL communications processor for data collected from the SEL-749M. Use the MAP n command to view these data. Table C.7 SEL Communications Processor Port 1 Region Map...

  • Page 233: Table C.9 Communications Processor Target Region

    Relay Word Bits (in Bits 7–0) Address 2804h STSET 2805h WARNING 2806h Table G.1, Row 0 2807h Table G.1, Row 1 2808h Table G.1, Row 2 2809h Table G.1, Row 3 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 234 RB1 in the SEL-749M. Breaker bit BR1 operates differently than remote bits. There are no breaker bits in the SEL-749M. For Circuit Breaker 1, when you set BR1, the SEL communications processor sends a message to the SEL-749M that asserts the motor stop bit STOP for one processing interval.

  • Page 235: Appendix D: Modbus Rtu Communications Protocol

    ® This appendix describes Modbus RTU communications features supported by the SEL-749M Relay on communications Port 3 or Port 4. Complete specifications for the Modbus protocol are available from the Modbus user’s group website at www.modbus.org. Enable Modbus protocol with the serial port settings. When Modbus protocol is enabled, the relay switches the port to Modbus protocol and deactivates the ASCII protocol.

  • Page 236: Table D.2 Sel-749M Modbus Function Codes

    Modbus RTU Communications Protocol Communications Protocol The SEL-749M SLAVEID setting defines the device address. Set this value to a unique number for each device on the Modbus network. For Modbus communication to operate properly, no two slave devices may have the same address.

  • Page 237: Table D.4 03H Read Holding Register Command

    CRC. If the calculated CRC matches the CRC sent by the SEL-749M, the master device uses the data received. If there is no match, the check fails and the message is ignored. The devices use a similar process when the master sends queries.

  • Page 238: Table D.6 04H Read Input Register Command

    Format error Illegal Data Value (03h) Bad Packet Format 06h Preset Single The SEL-749M uses this function to allow a Modbus master to write directly to a database register. Refer to the Modbus Register Map in Table D.23 for a Register Command list of registers that can be written by using this function code.

  • Page 239: Table D.10 10H Preset Multiple Registers Command

    Invalid register data value Illegal Data Value (03h) Illegal Write 60h Read Parameter The SEL-749M uses this function to allow a Modbus master to read parameter information from the relay. One parameter (setting) is read in each query. Information Command Table D.12 60h Read Parameter Information Command (Sheet 1 of 2)

  • Page 240: Table D.13 60H Read Parameter Descriptor Field Definition

    Table D.14 60h Read Parameter Conversion Field Definition Conversion Value Type Multiplier Divisor Offset Base Boolean Unsigned Integer Unsigned Integer Unsigned Integer Unsigned Integer 1000 Hexidecimal Integer Integer Integer Integer 1000 Enumeration Bit Enumeration SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 241: Table D.15 Responses To 60H Read Parameter Information Query Errors

    Illegal Address (02h) Invalid Address 61h Read Parameter The SEL-749M uses this function to allow a Modbus master to read parameter text from the relay. One parameter text (setting name) is read in each query. Text Command Table D.16 61h Read Parameter Text Command...

  • Page 242: Table D.18 62H Read Enumeration Text Command

    Modbus RTU Communications Protocol Communications Protocol 62h Read Enumera- The SEL-749M uses this function to allow a Modbus master to read parameter enumeration or bit enumeration values (setting lists) from the relay. One tion Text Command parameter enumeration is read in each query.

  • Page 243: Table D.21 7Dh Encapsulated Packet Query Errors

    Use the 60h, 61h, and 62h commands to retrieve parameter information, and use the 03 command to retrieve values. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 244 Modbus RTU Communications Protocol Communications Protocol Modifying Relay The SEL-749M does not provide password protection. It is assumed that because the interface is a binary protocol with CRC-16 protection, the Settings Using interface is being handled by an intelligent master system. Therefore, the Modbus master would provide password protection.

  • Page 245: Modbus Register Map

    SERVICE FACTOR 0.01 0.01 0011 (RW) MOTOR LRA xFLA 0012 (RW) LOCKD ROTOR TIME 6000 0013 (RW) ACCEL FACTOR 0.01 0.01 0014 (RW) RUN STATE TIME K 2000 0 = AUTO Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 246 002B (RW) NEU OC WARN DLAY 1200 Residual Overcurrent 002C (RW) RES OC TRIP EN 0 = N 1 = Y 002D (RW) RES OC TRIP LVL xFLA 0.01 0.01 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 247 0040 (RW) CI TRIP LEVEL 0041 (RW) CI TRIP DELAY 0042 (RW) CI WARN ENABLE 0 = N 1 = Y 0043 (RW) CI WARN LEVEL 0044 (RW) CI WARN DELAY Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 248 RTD Settings 0051 (RW) RTD ENABLE 0 = N 1 = Y 0052 (RW) RTD1 LOCATION 0 = OFF 1 = WDG 2 = BRG 3 = AMB 4 = OTH SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 249 0 = Off 005D (RW) RTD3 WARN LEVEL °C 0 = Off 005E (RW) RTD4 LOCATION 0 = OFF 1 = WDG 2 = BRG 3 = AMB 4 = OTH Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 250 0 = Off 0069 (RW) RTD6 WARN LEVEL °C 0 = Off 006A (RW) RTD7 LOCATION 0 = OFF 1 = WDG 2 = BRG 3 = AMB 4 = OTH SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 251 0 = Off 0075 (RW) RTD9 WARN LEVEL °C 0 = Off 0076 (RW) RTD10 LOCATION 0 = OFF 1 = WDG 2 = BRG 3 = AMB 4 = OTH Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 252 WIND TRIP VOTING 0 = N 1 = Y 0083 (RW) BEAR TRIP VOTING 0 = N 1 = Y 0084 (RW) TMP RTD BIASING? 0 = N 1 = Y SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 253 NEG VAR WARN LEV kVAR 25000 0098 (RW) POS VAR WARN EN 0 = N 1 = Y 0099 (RW) POS VAR WARN LEV kVAR 25000 009A (RW) VAR WARN DELAY Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 254 FREQ1 WARN ENABL 0 = N 1 = Y 00AF (RW) FREQ1 WARN LEVEL 00B0 (RW) FREQ1 WARN DELAY 2400 00B1 (RW) FREQ2 TRIP ENABL 0 = N 1 = Y SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 255 Analog Output 00C0 (RW) ANALOG OUT SEL 0 = LOAD_I 1 = %THERM 2 = WDG_RTD 3 = BRG_RTD 4 = PF 5 = PWR_kW 6 = AVG_I 7 = MAX_I Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 256 00CB (RW) OUT404 FAIL-SAFE 0 = N 1 = Y Event Report Settings 00CC (RW) EVENT LENGTH 0 = 15 1 = 64 00CD (RW) PREFAULT LENGTH 00CE (RW) MSR RESOLUTION SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 257 Date/Time Settings 00DD (RW) SET SEC 5999 0.01 0.01 00DE (RW) SET MIN 00DF (RW) SET HOUR 00E0 (RW) SET DAY 00E1 (RW) SET MONTH 00E2 (RW) SET YEAR 2000 9999 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 258 Power Data 0103 (R) REAL POWER –32768 32767 0104 (R) REACTIVE POWER kVAR –32768 32767 0105 (R) APPARENT POWER –32768 32767 0106 (R) POWER FACTOR –100 0.01 0107 (R) FREQUENCY SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 259 RUNNING TIME–mm 0122 (R) RUNNING TIME–hh 0123 (R) RUNNING TIME–dd 65535 0124 (R) STOPPED TIME–mm 0125 (R) STOPPED TIME–hh 0126 (R) STOPPED TIME–dd 65535 0127 (R) % TIME RUNNING 1000 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 260 MAX WDG TRD (C) degC –32768 32767 014B (R) MAX BRG TRD (C) degC –32768 32767 014C (R) AMBIENT RTD (C) degC –32768 32767 014D (R) MAX OTH RTD (C) degC –32768 32767 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 261 65535 016E (R) OVERFREQUENCY 65535 016F (R) 65535 0170 (R) 65535 0171 (R) STARTTIMER 65535 0172 (R) REMOTE TRIP 65535 0173 (R) OTHER TRIPS 65535 0174 (R) TOTAL TRIPS 65535 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 262 017E (R) EVENT IA 65535 017F (R) EVENT IB 65535 0180 (R) EVENT IC 65535 0181 (R) EVENT IN 65535 0182 (R) EVENT IG 65535 0183 (R) EVENT VAB/VAN 65535 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 263 Bit 9 = Comm Loss Bit 10 = Remote Trip Bit 11 = Comm Fault Bit 12 = Config Fault Bit 13 = Reserved Bit 14 = Reserved Bit 15 = Reserved Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 264 0198 (R) ILLEGAL FUNCTION 65535 0199 (R) ILLEGAL REGISTER 65535 019A (R) ILLEGAL WRITE 65535 019B (R) BAD PKT FORMAT 65535 019C (R) BAD PKT LENGTH 65535 019D–01AA (R) Reserved SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 265 Bit 9 = OUT102 Status Bit 10 = OUT401 Status Bit 11 = OUT402 Status Bit 12 = OUT403 Status Bit 13 = OUT404 Status Bit 14 = Running Bit 15 = Stopped Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 266 ROW 5 2115 (R) ROW 6 2116 (R) ROW 7 2117 (R) ROW 8 2118 (R) ROW 9 2119 (R) ROW 10 211A (R) ROW 11 211B (R) ROW 12 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 267: Table 4.19 Ptc Settings

    START MONITORING 300C (R) STAR DELTA SET 300D (R) START INHIBIT SET 300E (R) PHASE REV SET 300F (R) SPEED SW SET 3010 (R) PTC SETTINGS 3011 (R) RTD SETTINGS Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 268: Table 4.23 Var Settings

    ASA NUMBER LOW 65535 4003 (RW) ASA NUMBER HIGH 65535 4004 (R) FIRMWARE REVISION 32639 4005 (R) NUM OF PAR 4006 (R) NUM OF PAR GROUP 4007 (RW ) MAC ID SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 269 Bit 0 = 2nd IO Card installed Bits 1–15 = Reserved 4010 (RW) SETTINGS TIMEOUT 65535 4011–4013 Reserved 4014 (R) CONFIGURED BIT Bit 0 = Unit Configured Bits 1–15 = Reserved 4015 (R) Reserved Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 270 All addresses in this table refer to the register addresses in the Modbus packet. Registers labeled (RW) are read-write registers. Registers labeled (W) are write-only registers. Registers labeled (R) are read-only registers. Reserved addresses return 0. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 271: Appendix E Devicenet

    Instruction Manual DeviceNet Card The DeviceNet Communication Card is an optional accessory that enables connection of the SEL-749M to the DeviceNet automation network. The card occupies the communication expansion slot in the relay. Communication Expansion Slot Figure E.1 SEL-749M Motor Relay Back Panel View With DeviceNet...

  • Page 272: Features

    ➤ Rotary switches let you set the node address and network data rate prior to mounting in the SEL-749M and applying power. Alternatively, the switches can be set to positions that allow for configuration of these settings over the DeviceNet network, utilizing a network configuration tool such as RSNetWorx for DeviceNet.

  • Page 273: Electronic Data Sheet

    The EDS file for the SEL-749M, SEL-749M , is located on the Rxxx.EDS SEL-749M Product Literature CD, or you can download the file from the SEL website at www.selinc.com. Complete specifications for the DeviceNet protocol are available on the Open DeviceNet Vendor’s Association (ODVA) website www.odva.org.
  • Page 274 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 275: Appendix F Motor Thermal Element

    Appendix F Motor Thermal Element Instruction Manual Overview The SEL-749M Relay uses a patented protection algorithm to provide effective motor thermal protection. The relay offers two convenient methods to set the thermal element. They are: ➤ Motor ratings method ➤...

  • Page 276: Purpose Of Motor Thermal Protection

    The SEL-749M Relay thermal element, with its integrated design, offers distinct advantages over the use of discrete elements. The SEL-749M Relay thermal element always operates in one of two modes: starting or running. In starting mode, the thermal element provides locked rotor protection, allowing the motor to absorb the high energy of the I threshold represented by the rated locked rotor current and time.

  • Page 277: The Basic Thermal Element

    A comparator to compare the present heat estimate, U, to the thermal trip value. Thermal Trip Value — Thermal Trip Heat Source Figure F.2 Electrical Analog of a Thermal System Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 278: Figure F.3 Typical Induction Motor Current, Torque, And Rotor Resistance Versus Slip

    The positive-sequence rotor resistance is represented as a linear function of slip S by Equation F.3. – • Equation F.3 where: = Positive-sequence rotor resistance at slip S = 1 = Positive-sequence rotor resistance at slip S = 0 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 279 The differences in the positive- and negative-sequence heating factors immediately suggest that the thermal element should have two models representing motor starting and running. The SEL-749M Relay thermal element automatically selects the appropriate model to use based on the measured sum of the positive-sequence current and the negative-sequence...

  • Page 280: Motor Starting Protection

    SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 281: Motor Running Protection

    Locked Rotor Trip Energy • Ta • To Normal Operating Energy • (Ta – To) Base or Ambient Energy Figure F.6 Calculating the Normal Operating Energy by Using Locked Rotor Trip Times Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 282 Motor Starting Trip Threshold • To = 36 • 12 = 432 Motor Running Trip Threshold • (Ta – To) • SF = 36 • 2.4 • 1.323 = 114.3 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...

  • Page 283: Interpreting Percent Thermal Capacity Values

    The cooling can usually take place while the motor is stopped or running. The SEL-749M helps to ensure that a motor start is not attempted while the motor is still too hot to be started safely. The TCSTART setting allows you to define a fixed value of thermal capacity used above which the relay asserts the Thermal Lockout until the motor is cool.
  • Page 284 0.9 SF and RTC in Equation F.11. RTC = Auto • • – 0.9 SF • ------------------------------------------------ - ------------------------------------ - • – – 0.9 SF ------------------------------------- - – Equation F.13 SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 285 • 0.9 SF and RTC in Equation F.11. • • 2.5 CURVE – 0.9 SF • -------------------------------------------------- ------------------------------------- • – – 0.9 SF -------------------------------------- - 36 SF – Equation F.17 Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 286 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 287: Appendix G Relay Word Bits

    Instruction Manual Overview The protection and control element results are represented by Relay Word bits in the SEL-749M Relay. Each Relay Word bit has a label name and can be in either of the following states: ➤ 1 (logical 1) ➤...

  • Page 288: Definitions

    IN302 IN303 IN304 IN305 IN306 IN307 IN308 Definitions Table G.2 Relay Word Bit Definitions for the SEL-749M (Sheet 1 of 7) Definition Reserved for future use 27P1 Phase Undervoltage Level 1 Trip Pickup (see Figure 4.13) 27P1T Phase Undervoltage Trip Definite time delayed (see Figure 4.13)
  • Page 289 Relay Word Bits Definitions Table G.2 Relay Word Bit Definitions for the SEL-749M (Sheet 2 of 7) Definition 48LJTC Load jam torque control. Bit controlled by Protection Disable (Table 4.13) and/or Trip Inhibit (Table 4.30) settings. (For internal use only.) Thermal (Overload) Alarm.
  • Page 290 Relay Word Bits Definitions Table G.2 Relay Word Bit Definitions for the SEL-749M (Sheet 3 of 7) Definition 81D2T Definite-Time Over- and Underfrequency Element (Trip Level 2). Assert when the frequency has been either above or below the element set point for a definite time (see Figure 4.19).
  • Page 291 Relay Word Bits Definitions Table G.2 Relay Word Bit Definitions for the SEL-749M (Sheet 4 of 7) Definition Contact input ( IN401–IN403 available with 3 DI/4 DO /1 AO card in Slot D) IN402 IN403 Contact input ( IN401–IN403 available with 3 DI/4 DO /1 AO card in Slot D)
  • Page 292 Relay Word Bits Definitions Table G.2 Relay Word Bit Definitions for the SEL-749M (Sheet 5 of 7) Definition Remote Bit 5 asserted (see Figure 4.27) Remote Bit 6 asserted (see Figure 4.27) Remote Bit 7 asserted (see Figure 4.27) Remote Bit 8 asserted (see Figure 4.27)
  • Page 293 Relay Word Bits Definitions Table G.2 Relay Word Bit Definitions for the SEL-749M (Sheet 6 of 7) Definition RTDBIAS RTD Bias Alarm. When enabled, asserts when the motor winding temperature rise is greater than 60°C over ambient and the RTD % Thermal Capacity is more than ten percentage points higher than the motor thermal element % Thermal Capacity.
  • Page 294 Relay Word Bits Definitions Table G.2 Relay Word Bit Definitions for the SEL-749M (Sheet 7 of 7) Definition SV05 control equation variable timer input SV05 (see Figure 4.30) OGIC SV05T control equation variable timer output SV05T (see Figure 4.30) OGIC...

  • Page 295: Glossary

    (MVA). Accounts for both real (P) and reactive (Q) power dissipated in a circuit: S = P + jQ. Abbreviation for American Standard Code for Information Interchange. ASCII Defines a standard way to communicate text characters between two elec- Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 296 To activate; to fulfill the logic or electrical requirements needed to operate a Assert device. To apply a short-circuit or closed contact to an SEL-749M input. To set a logic condition to the true state (logical 1). To close a normally-open out- put contact.
  • Page 297 Fundamental Meter Type of meter data presented by the SEL-749M that includes the present val- ues measured at the relay ac inputs. The word “Fundamental” is used to indi- cate that the values are Fundamental Frequency values and do not include harmonics.
  • Page 298 120°, and the C-phase voltage lags B-phase voltage by 120°. In an ACB phase rotation system, the C-phase voltage lags the A-phase voltage by 120°, and the B-phase voltage lags the C-phase voltage by 120°. SEL-749M Relay Instruction Manual Date Code 20080918...
  • Page 299 Abbreviation for Resistance Temperature Device. An RTD is made of a metal having a precisely known resistance and temperature coefficient of resistance. The SEL-749M and the SEL-2600 modules can measure the resistance of the RTD, and thus, determine the temperature at the RTD location—typically embedded in the motor windings or attached to the races of bearings.
  • Page 300 Self-Test—Z-Number Self-Test A function that verifies the correct operation of a critical device subsystem and indicates if an out-of-tolerance condition is detected. The SEL-749M is equipped with self-tests that validate the relay power supply, microprocessor, memory, and other critical systems.

  • Page 301: Index

    10.6 Contactor/Circuit Breaker Auxiliary See Trip Inhibit clear data buffers 10.6 Contact 4.36 connection check 10.6 contact input 4.36 required equipment 10.3 control equation 52A 4.36 Communication access levels 7.10 Date Code 20080918 Instruction ManuaI SEL-749M Relay Courtesy of NationalSwitchgear.com...

  • Page 302: Table 7.19 Date Command

    Fast SER voltages, delta 10.9 Event FILE Command 7.15 data capture time 4.44 Fundamental Meter ER control equation Firmware front-panel function length 4.44 upgrade instructions – METER command 7.17 nonvolatile versions SEL-749M Relay Instruction ManuaI Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 303 PASSWORD Command 7.19 cyclical redundancy check logic diagram 4.14 Phase Overcurrent Elements EIA-485 port 4.41 Load Loss Element See Overcurrent Elements exception responses See Undercurrent (Load Loss) function codes Elements Date Code 20080918 Instruction ManuaI SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 304 R_TRIG Operator 4.50 SNS Command 7.24 – RTD-based protection 4.21 4.23 Rack Mounting Accessory Software ( QuickSet) ERATOR SEL-749M Relay Reactive databases features power measurement convention device editor options expression builder Reactive Power Self Tests 10.11 Human Machine Interface See also VAR Elements...
  • Page 305 TR 4.34 starting protection trip Relay Word bit 4.34 theory trip unlatch ULTRIP 4.35 Thermal Limit Troubleshooting 10.13 600 HP motor example setting error messages curves, rating Date Code 20080918 Instruction ManuaI SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 306 This page intentionally left blank Courtesy of NationalSwitchgear.com...

  • Page 307: Sel-749M Relay Command Summary

    SEL-749M Relay Command Summary The table below lists the front serial port ASCII commands associated with particular activities. The commands are shown in uppercase letters, but they can also be entered with lowercase letters. Instruction Manual Serial Port Command Command Description Access Level O Commands Go to Access Level 1.
  • Page 308 Adding ROW to the command displays the Relay Word Row number at the start of each line View time. TIM hh:mm:ss Set time by entering TIM followed by hours, minutes, and seconds, as shown (24-hour clock). Trigger an event report data capture. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 309 Sends CANCEL command to abort Exits setting editing session, then current command and return to prompts user to save settings. current access level prompt. <Ctrl+X> Aborts setting editing session without saving changes. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 310 This page intentionally left blank Courtesy of NationalSwitchgear.com...
  • Page 311 SEL-749M Relay Command Summary The table below lists the front serial port ASCII commands associated with particular activities. The commands are shown in uppercase letters, but they can also be entered with lowercase letters. Instruction Manual Serial Port Command Command Description Access Level O Commands Go to Access Level 1.
  • Page 312 Adding ROW to the command displays the Relay Word Row number at the start of each line View time. TIM hh:mm:ss Set time by entering TIM followed by hours, minutes, and seconds, as shown (24-hour clock). Trigger an event report data capture. SEL-749M Relay Instruction Manual Date Code 20080918 Courtesy of NationalSwitchgear.com...
  • Page 313 Sends CANCEL command to abort Exits setting editing session, then current command and return to prompts user to save settings. current access level prompt. <Ctrl+X> Aborts setting editing session without saving changes. Date Code 20080918 Instruction Manual SEL-749M Relay Courtesy of NationalSwitchgear.com...
  • Page 314 This page intentionally left blank Courtesy of NationalSwitchgear.com...

Table of Contents