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EET PMC-D726M User Manual

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PMC-D726M
Digital Multifunction Meter
User Manual
Version: V1.0
November 7, 2017

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Summary of Contents for EET PMC-D726M

  • Page 1 PMC-D726M Digital Multifunction Meter User Manual Version: V1.0 November 7, 2017...
  • Page 2 CET Electric Technology This manual may not be reproduced in whole or in part by any means without the express written permission from CET. The information contained in this manual is believed to be accurate at the time of publication; however, CET assumes no responsibility for any errors which may appear here and reserves the right to make changes without notice.
  • Page 3 CET Electric Technology DANGER Failure to observe the following instructions may result in severe injury or death and/or equipment damage.  Installation, operation and maintenance of the meter should only be performed by qualified, competent personnel that have the appropriate training and experience with high voltage and current devices.
  • Page 4 CET Electric Technology Limited warranty  CET offers the customer a minimum of 12-month functional warranty on the meter for faulty parts or workmanship from the date of dispatch from the distributor. This warranty is on a return to factory for repair basis. ...

  • Page 5: Table Of Contents

    Table of Contents Chapter 1 Introduction ......................... 7 1.1 Overview ..........................7 1.2 Features ..........................7 1.3 PMC-D726M’s Application in Power and Energy Management Systems......8 1.4 Getting more information ..................... 9 Chapter 2 Installation ......................... 10 2.1 Appearance ......................... 10 2.2 Dimensions ..........................
  • Page 6 CET Electric Technology 4.2 Power and Energy ....................... 30 4.2.1 Basic Measurements ....................30 4.2.2 Energy Measurements ..................... 30 4.2.3 Demand Measurements ..................31 4.3 Power Quality ........................31 4.3.1 Phase Angles ......................31 4.3.2 Power Quality Parameters ..................32 4.3.3 Unbalance ........................

  • Page 7: Chapter 1 Introduction

    “meter” generally refers to all models. Differences between the models are indicated with the appropriate model number. This chapter provides an overview of the PMC-D726M meter and summarizes many of its key features. 1.1 Overview The PMC-D726M Digital Multifunction Meter is CET’s latest offer for the low-cost digital power/energy metering market.

  • Page 8: Pmc-D726M's Application In Power And Energy Management Systems

    Easy integration into other Automation, SCADA or BMS systems via Modbus RTU 1.3 PMC-D726M’s Application in Power and Energy Management Systems The PMC-D726M can be used to monitor Wye or Delta connected power system. Modbus communications allow real-time data, events, DI status and other information to be transmitted across...

  • Page 9: Getting More Information

    CET Electric Technology Figure 1-1 PMC-D726M’s application 1.4 Getting more information Additional information is available from CET via the following sources:  Visit www.cet-global.com  Contact your local representative  Contact CET directly via email or telephone...

  • Page 10: Chapter 2 Installation

    Chapter 2 Installation Caution Installation of the PMC-D726M should only be performed by qualified, competent personnel that have the appropriate training and experience with high voltage and current devices. The meter must be installed in accordance with all local and national electrical codes.

  • Page 11: Dimensions

    CET Electric Technology Figure 2-3 Rear Panel (2DI) 2.2 Dimensions 2.2.1 Main Unit Figure 2-4 Dimension (LCD) Figure 2-5 Dimensions (LED)

  • Page 12: Terminals

    CET Electric Technology 2.2.2 Terminals Figure 2-6 Terminal Dimensions Terminal Terminal Dimensions Wire Size Max. Torque 5 kgf.cm/M3 RS485 2.6mm x 3.3mm 1.5mm (4.3 lb-in) Power Supply 1.0mm - 2.5mm 6.0 kgf.cm/M3 Current Input/Voltage Input 6.4mm x 6.4mm (14AWG - 22AWG) (5.2 lb-in) Table 2-1 Terminal Dimensions 2.2.3 SCCTs...
  • Page 13 CET Electric Technology  PMC-SCCT-100A-40mA-16-A Figure 2-8 PMC-SCCT-100A-40mA-16-A Dimensions  PMC-SCCT-200A-40mA-24-A Figure 2-9 PMC-SCCT-200A-40mA-24-A Dimensions  PMC-SCCT-400A-40mA-35-A Figure 2-10 PMC-SCCT-400A-40mA-35-A Dimensions...

  • Page 14: Mounting

     PMC-SCCT-800A-40mA-A Figure 2-11 PMC-SCCT-800A-40mA-A Dimensions 2.3 Mounting The PMC-D726M should be installed in a dry environment with no dust and kept away from heat, radiation and electrical noise source. Installation steps:  Remove the installation clips from the meter ...

  • Page 15: Wiring Connections

    Figure 2-13 Panel Cutout (LED) 2.4 Wiring connections PMC-D726M can satisfy both Wye and Delta three phase power systems. Please read this section carefully before installation and choose the correct wiring method for your power system. The following Wiring Modes are supported: ...

  • Page 16: 3-Phase 4-Wire (3P4W) Wye Direct Connection With 2Cts

    CET Electric Technology Figure 2-14 3-Phase 4-Wire Wye, no PTs, 3 CTs 2.4.2 3-Phase 4-Wire (3P4W) Wye Direct Connection with 2CTs Please consult the serial number label to ensure that the system phase voltage is less than or equal to the meter’s voltage input specification.

  • Page 17: 3-Phase 3-Wire (3P3W) Open Delta With 2Pts And 2Cts

    Figure 2-17 3-Phase 3-Wire Delta, 2PTs, 2CTs 2.5 Communications Wiring The PMC-D726M provides one RS485 port and supports the Modbus RTU protocol. Up to 32 devices can be connected on a RS485 bus. The overall length of the RS485 cable connecting all devices should not exceed 1200m.

  • Page 18: Digital Input Wiring

    RS-485 connections on the PMC-D726M. Figure 2-18 Communications Connections 2.6 Digital Input Wiring The following figure illustrates the Digital Input connections on the PMC-D726M: Figure 2-19 DI Connections 2.7 Digital Output Wiring The following figure illustrates the Digital Output connections on the PMC-D726M: Figure 2-20 DO Connections 2.8 Analog Output Wiring...

  • Page 19: Power Supply Wiring

    CET Electric Technology Figure 2-22 Pulse Output Connections 2.10 Power Supply Wiring For AC supply, connect the live wire to the L/+ terminal and the neutral wire to the N/- terminal. For DC supply, connect the positive wire to the L/+ terminal and the negative wire to the N/- terminal. Figure 2-23 Power Supply Connections...

  • Page 20: Chapter 3 Front Panel

    CET Electric Technology Chapter 3 Front Panel The PMC-D726M meter has a large, bright, backlit LCD or a high-contrast LED display and four buttons for data display and meter configuration. This chapter introduces the front panel operations. Figure 3-1 Front Panel (LCD) Figure 3-2 Front Panel (LED) 3.1 Display...

  • Page 21: Lcd Display Areas

    CET Electric Technology 3.1.2 LCD Display Areas This section provides a description of the LCD display areas. The PMC-D726M with LCD display can generally be divided into 4 areas: A: Measurement values B: Measurement symbols for parameters such as Voltage, Current, THD, Unbalance, PF, Voltage Phase Angle, Current Phase Angle and Demand, ..etc.

  • Page 22: Led Display Symbols

    CET Electric Technology DI Open DI Close DO Open DO Close Import Export Total Table 3-1 LCD Display Symbols 3.1.3 LED Display Symbols The following table shows the special LED display symbols: Label Description Table 3-2 LED Display Segments 3.2 Using the Front Panel Buttons The button definitions under Display Mode and Setup Mode are explained in the following table.

  • Page 23: Display Screen Types

    3.3 LED Pulse Outputs The PMC-D726M comes standard with two LED Pulse Outputs on its front panel, labeled kWh and kvarh, which can be used for kWh and kvarh energy pulsing if the EN PULSE is enabled (see Section 4.1.3 Energy Pulse Outputs for more information).

  • Page 24: Setup Configuration Via The Front Panel

    * Available in Firmware V1.00.03 or later. Available in Firmware V1.00.04 or later. ~ Available in Firmware V1.00.07 or later. Table 3-5 PMC-D726M Data Display Screens Notes: This screen only appears when the Wiring Mode is set to Wye. This screen only displays on Model with the DI options.

  • Page 25: Setup Menu

    CET Electric Technology  After modification, press the <Setup> button to save the new value into memory.  If necessary, pressing the <System> button from inside a sub-menu to return to the main menu. Returning to Data Display mode:  Pressing the <Setup>...

  • Page 26: Configuration

    CET Electric Technology 3.5.3 Configuration The Setup Configuration mode provides access to the following setup parameters: Label Parameters Description Range Default Menu Main Setup Configuration PROG Programming Mode PASS Password Enter Password 0 to 9999 “0” Enter Sub Menu to PASS SET YES/NO change password?
  • Page 27 CET Electric Technology Output of 20 mA DO SET Set DOs Control DO1 Control DO1 Control ON/OFF/NRM DO2 Control DO2 Control Preset Energy Enter sub menu to ENGY SET YES/NO Values preset Energy Values Preset kWh Import kWh Import 0 to 99,999,999.9 Value Preset kWh Export kWh Export...
  • Page 28 40mA Current Input respectively, where kXh may be kWh or kvarh. The default values of 40 and 3200 correspond to a PMC-D726M with 40mA Current Input and other Current Inputs which include 5A, 1A and 2.5mA, respectively.

  • Page 29: Chapter 4 Applications

    Please refer to Section 4.4 for a detailed description. Since there are multiple ways to trigger the Digital Outputs on the PMC-D726M, a prioritized scheme has been developed to avoid conflicts between different applications. In general, Front Panel Control has the highest priority and can override other control schemes.

  • Page 30: Ao Output

    CET Electric Technology 4.1.4 AO Output The PMC-D726M comes optionally with an Analog Output which can be programmed as 0mA to 20mA or 4mA to 20mA output. There are 4 setup parameters: Parameter Description Type Select between 0-20mA or 4-20mA output.

  • Page 31: Demand Measurements

    4.2.3 Demand Measurements Demand is defined as the average power consumption over a fixed interval (usually 15 minutes) based on the sliding window method. The PMC-D726M provides the following Demand and Peak Demand measurements since Firmware V1.00.04 (LED)/V1.01.04 (LCD): Ia, Ib, Ic...

  • Page 32: Power Quality Parameters

    The PMC-D726M provides the following PQ parameters: 4.3.2.1 Harmonics The PMC-D726M provides harmonic analysis for THD, TOHD, TEHD and individual harmonics up to the order. All harmonic parameters are available through communications. In addition, the PMC-D726M also provides TDD, K-factor and Crest-factor measurements for Current.

  • Page 33: Unbalance

    I1, I2 are the Positive and Negative Sequence Components for Current, respectively. 4.4 Setpoints The PMC-D726M comes standard with 6 user programmable Setpoints which provide extensive control by allowing a user to initiate an action in response to a specific condition. Typical Setpoint applications include alarming, fault detection and power quality monitoring.
  • Page 34 CET Electric Technology Figure 4-1 Over Setpoint Figure 4-2 Under Setpoint Setpoints can be programmed over communications and have the following setup parameters: Setup Parameter Definition Options/Default* 0=Over Setpoint* Setpoint Type Over or Under Setpoint. 1=Under Setpoint Setpoint Specify the parameter to be monitored. See Table 4-8 Parameter Specify the value that the Setpoint parameter must exceed...

  • Page 35: Logging

    4.5 Logging 4.5.1 Peak Demand Log The PMC-D726M records the Peak Demand of This Month (Since Last Reset) and Last Month (Before Last Reset) with timestamp for Ia, Ib, Ic, kW Total, kvar Total and kVA Total since Firmware V1.00.04 (LED)/V1.01.04 (LCD).

  • Page 36: Time Of Use (Tou)

    TOU is used for electricity pricing that varies depending on the time of day, day of week and season. The TOU system allows the user to configure an electricity price schedule inside the PMC-D726M and accumulate energy consumption into different TOU tariffs based on the time of consumption. TOU programming is only supported through communications.

  • Page 37: Chapter 5 Modbus Register Map

    Chapter 5 Modbus Register Map This chapter provides a complete description of the Modbus register map (Protocol Versions 1.4 and above) for the PMC-D726M Digital Multifunction Meter to facilitate the development of 3 party communications driver for accessing information on the PMC-D726M. For a complete Modbus Protocol Specification, please visit www.modbus.org.

  • Page 38: Energy Measurements

    CET Electric Technology 0062 Phase B Fundamental PF INT16 0063 Phase C Fundamental PF INT16 0064~0094 Reserved 0095 Setpoint Status INT16 0096 DO Status INT16 0097 DI Status INT16 0098 SOE Pointer UINT32 Available in Firmware Version V1.00.04 (LED)/V1.01.04 (LCD) or later Table 5-1 Basic Measurements Notes: When the Wiring Mode is Delta, the per phase line-to-neutral voltages, kWs, kvars, kVAs and PFs have no...

  • Page 39: Harmonic Measurements

    CET Electric Technology Notes: The Energy registers have a maximum value of 1,000,000,000 in units of 0.1 kXh and will roll over to zero automatically when it is reached. The Energy registers for TOU T1 to T4 are available in Firmware V1.00.04 (LED)/V1.01.04 (LCD) or later. 5.3 Harmonic Measurements The Harmonic Measurements are available in Firmware V1.00.04 (LED)/V1.01.04 (LCD) or later.

  • Page 40: Demands

    CET Electric Technology 1620 Ubn (Wye)/Ubc (Delta) HD02 Float 1622 Ucn (Wye)/Uca (Delta) HD02 Float 1624~1790 … Float 1792 Uan (Wye)/Uab (Delta) HD31 Float 1794 Ubn (Wye)/Ubc (Delta) HD31 Float 1796 Ucn (Wye)/Uca (Delta) HD31 Float Table 5-6 Voltage Harmonic Measurements Notes: When the Wiring Mode is Wye, the phase A/B/C Voltage THD/TOHD/TEHD/HDxx mean phase AB/BC/CA Voltage THD/TOHD/TEHD/HDxx.
  • Page 41 CET Electric Technology described in Table 5-12. Register Property Description Format 10000-10007 Event 1 10008-10015 Event 2 10016-10023 Event 3 10024-10031 Event 4 10032-10039 Event 5 10040-10047 Event 6 10048-10055 Event 7 10056-10063 Event 8 Table 5-12 SOE 10064-10071 Event 9 LOG Data Structure 10072-10079...

  • Page 42: Device Setup

    CET Electric Technology None Over In Setpoint Active None Over Frequency Setpoint Active None Over kW Total Setpoint Active None Over kvar Total Setpoint Active None Over kVA Total Setpoint Active None Over PF Total Setpoint Active None Over kW Total Present Demand Setpoint Active Over kvar Total Present Demand Setpoint None Active...
  • Page 43 CET Electric Technology (Default = 100V) 1V to 690V 6002 PT Secondary Voltage INT32 (Default = 100V) 1A to 30,000A 6004 CT Primary Current INT32 (Default = 5A) 6006 CT Secondary Current INT32 1A to 5A* 6008-6010 Reserved 6011 Wiring Mode INT16 0=WYE*, 1=DELTA, 2=DEMO 6012...

  • Page 44: I/O Setup Parameters

    CET Electric Technology I avg FREQ Table 5-15 AO Key In the table above, FREQ with a scale "×100, Hz", PF Total with a scale "×1000", the values of the other parameters in the registers are in accordance with the actual values. Voltage, Current Specification and corresponding Pulse Constant Voltage Inputs Current Inputs...

  • Page 45: Tou Setup

    6558 Trigger Action 1 UINT16 0 to 4 6559 Trigger Action 2 UINT16 Table 5-18 Setpoint Setup Parameters Notes: The PMC-D726M provides the following Setpoint parameters: Parameter Scale/Unit None x100, V x100, V x1000, A x1000, A FREQ x100, Hz...

  • Page 46: Season

    CET Electric Technology 5.7.2 Season Register Property Description Format Range/Note 7100 Season #1: Start Date UINT16 0x0101 7101 Season #1: Weekday#1 Daily Profile UINT16 0 (Daily Profile #1) 7102 Season #1: Weekday#2 Daily Profile UINT16 9 (Daily Profile #10) 7103 Season #1: Weekday#3 Daily Profile UINT16 High-order Byte: Month...

  • Page 47: Alternate Days

    5.8 Time There are two sets of Time registers supported by the PMC-D726M – Year / Month / Day / Hour / Minute / Second (Registers # 60000 to 60002) and UNIX Time (Register # 60004). When sending time to the PMC-D726M over Modbus communications, care should be taken to only write one of the two Time register sets.

  • Page 48: Do Control

    Modbus Holding Registers (4XXXXX), which can be controlled with the Force Single Coil command (Function Code 0x05) or the Preset Multiple Hold Registers (Function Code 0x10). The PMC-D726M does not support the Read Coils command (Function Code 0x01) because DO Control registers are “Write- Only”.
  • Page 49 0x43 9803 0x2D 9804 0x44 9805 0x37 9806 0x32 9807 0x36 9808 0x4D 9809~9819 0x20 Null Table 5-30 ASCII Encoding of “PMC-D726M” For 2.5mA (SCCTA Option for 5A SCCT) Current Input, the Current Input would be read as 5A too.

  • Page 50: Appendix A Technical Specifications

    CET Electric Technology Appendix A Technical Specifications Voltage Inputs (V1, V2, V3, VN) Standard 240VLN/415VLL Range 10V to 120% Un Starting Voltage PT Ratio 1-1,000,000 (Primary), 1-690 (Secondary) Overload 1.2xUn continuous, 2xUn for 1s Burden <0.02VA per phase Frequency 45-65Hz Current Inputs (I11, I12, I21, I22, I31, I32) Standard Input Optional Input...
  • Page 51 CET Electric Technology Accuracy  5A/1A Current Input Parameters Accuracy Resolution Voltage ±0.2% reading 0.1V Current ±0.2% reading 0.001A kW, kvar, kVA ±0.5% reading 0.001kX IEC 62053-21 Class 1 0.01kWh kvarh IEC 62053-23 Class 2 0.01kvarh P.F. ±1.0% reading 0.001 Frequency ±0.02 Hz 0.01Hz...

  • Page 52: Appendix B Standards Compliance

    CET Electric Technology Appendix B Standards Compliance Safety Requirements EN 61010-1-1: 2001 CE LVD 2006 / 95 / EC EN 61010-2-030: 2010 Insulation IEC 60255-5: 2000 Dielectric test: 2kV @ 1 minute Insulation resistance: >100MΩ Impulse voltage: 6kV, 1.2/50µs Electromagnetic Compatibility CE EMC Directive 2004 / 108 / EC (EN 61326: 2006) Immunity Tests Electrostatic discharge...

  • Page 53: Appendix C Ordering Guide

    CET Electric Technology Appendix C Ordering Guide...

  • Page 54: Contact Us

    CET Electric Technology Contact us CET Inc. 8/F, Westside, Building 201, Terra Industrial & Trade park, Che Gong Miao, Shenzhen, Guangdong, P.R.China 518040 Tel: +86.755.8341.5187 Fax: +86.755.8341.0291 Email: support@cet-global.com Web: www.cet-global.com...

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