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Siemens MJ-4 Series Installation Manual

Communications module, fiber optic and rs-232/485, for mj-4a, mj-xl and mj-x control panels
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TM
MJ-4
Communications Module
Fiber Optic and RS-232/485
Installation Manual for MJ-4A
POWER
Watchdog
Communications
Manual No. 21-115-527-024 rev02
TM
L TM
, MJ-X
RS - 232 / 485
Communications Module
IN
MJ-4 Communications Module
TM
and MJ-X
Control Panels
G
R
Data
N
T
D
N
-
OUT
Rxd
R
T
C
R
x
x
T
T
+
d
d
S
S
Txd

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Summary of Contents for Siemens MJ-4 Series

  • Page 1 MJ-4 Communications Module Fiber Optic and RS-232/485 L TM Installation Manual for MJ-4A , MJ-X and MJ-X Control Panels RS - 232 / 485 Data Communications Module POWER Watchdog Communications MJ-4 Communications Module Manual No. 21-115-527-024 rev02...
  • Page 2 Siemens reserves the right to make changes in the specifications shown herein or to make improvements at any time without notice or obligations. Should a conflict arise between the general information contained in this publication and the contents of drawings or supplementary material or both, the latter shall take precedence.

  • Page 3: Table Of Contents

    Table of Contents INTRODUCTION ...............................1 ..............................1 ESCRIPTION LED I ............................1 NDICATORS TRANSMISSION METHODS ...........................1 ..........................2 IBER PTIC RANSMISSION ............................2 RANSMISSION 2.2.1 RS-232 ..............................2 2.2.2 RS-485 ..............................3 COMMUNICATION PROTOCOLS ........................4 INSTALLING THE COMMUNICATIONS MODULE IN MJ- 4 CONTROL PANELS ......4 MJ-4 R ........................4 EMOVING THE OVER...
  • Page 4 7-3 M ............................16 ABLE ODEM IRING 7-4 C ........................17 ABLE OMMUNICATIONS TEMS MJ-4A, MJ-4B, MJ-XL, MJ-X, MJXtra, and MJXplorer are trademarks of Siemens Energy, Inc. Siemens is a registered trademark of Siemens AG. © 1994 - 2008 Siemens Energy, Inc.

  • Page 5: Introduction

    MJ-4 Tap Changer Control Panels. 1.1 Description The Siemens MJ-4 Communications Module is the communication interface used to connect the MJ-4 Control Panel to a network of regulator controllers, control devices, and supervisory equipment. Figure 1-1 illustrates the MJ4 Communications Module.

  • Page 6: Fiber Optic Transmission

    2.1 Fiber Optic Transmission The primary benefits of fiber optic communications are its immunity to induced electrical interference and relatively low signal loss. Electrical noise cannot be induced into the cable to generate transient spikes that disrupt data communications. The Fiber Optic interface on the Communications Module uses multi-mode fiber optic cable. The electrical signals are converted to optical signals by the communication unit.

  • Page 7: Rs-485 Configuration - Loop Network

    MJ-4 Communications Module 2.2.2 RS-485 The maximum distance for RS-485 is 4000 feet, either from device to device or for an entire loop. The recommended cable for RS-485 is shielded, two twisted-pair, 22 AWG. This type of cable consists of jacketed wire that is twisted together and wrapped in a shield to prevent electromagnetic interference from affecting the data signal.

  • Page 8: Communication Protocols

    3 Communication Protocols The MJ-4 Control Panel is designed to be used in a network of intelligent power control devices communicating with a supervisory device or remote terminal unit (RTU). Each device on the network has a specific communications address assigned to allow messages to be directed to and from the device. Messages are transmitted from the RTU to all devices and only the device with the specified address will respond.

  • Page 9: Mounting The Communications Module

    MJ-4 Communications Module Remove 4 Case Screws Uncurl cable-clamp and slide cable out Figure 4-1 MJ-4 Rear Cover. 4.2 Mounting the Communications Module Hold the communications module in place over the five standoffs on the main PCB and insert the 24-pin connector on the ribbon cable into the 24-pin connector (P8) on the main PCB.

  • Page 10: Setting The Communications Module Jumpers

    4.3 Setting the Communications Module Jumpers Prior to installing the Communications Module into the MJ-4 Control Panel, ensure that the jumpers are properly installed on the printed circuit board. Jumper selections for the Fiber Optic interface and RS232/485 interface are described in separate sections below.

  • Page 11: Replacing The Mj-4 Rear Cover

    MJ-4 Communications Module In an RS-485 application, connect Signal Return (RTN) between the communication devices when there is a ground potential rise between the connected devices. When the device RTN pins are connected, jumper J11 should be Out (unless required by safety codes) to prevent ground loop currents. (If it is necessary to connect the RTN to GND after the Communications Module is installed, you can make this connection at the 8-pin terminal block connector with a wire jumper.) Table 4-2 RS-232/485 Interface Jumper Settings...

  • Page 12: Installing The Communications Module In Mj-X Control Panels

    Follow these steps to install the communications module in the MJ-X Control Panel. 1. If the control panel is installed on a Siemens regulating device, first turn off the power to the MJ-X, then disconnect the polarized disconnect switch (PDS) terminal block and remove the control panel from the control box.

  • Page 13: Mj-X Control Panel Rear Cover Figure 5-2 Communications Module Installation In Mj-X

    MJ-4 Communications Module 4. Feed the PDS cable harness through the strain relief cutout while removing the rear cover. 5. Remove the accessory cover plate from the rear cover. Discard the accessory cover plate and mounting hardware. If an Expansion Rack is installed in the accessory area, remove the rack and discard. 6.

  • Page 14: Verifying The Communications Module Installation

    7. Mount the communications module pan cover (if provided) with six 6-32 x 3/8” screws as shown in Figure 5-2. 8. Plug the ribbon connector into J105 on the MJ-X Processor Board as shown in Figure 5-4. POWER W dog Com m Connector J105 Membrane Switch Cable...

  • Page 15: Performing The Initial Diagnostic Checkout

    6.1 Performing the Initial Diagnostic Checkout Prior to performing these tests, become familiar with operating and configuring the MJ-4 Control Panel. See the MJ-4A & MJ-4B Voltage Regulator Control Panel Installation and Operations Manual (Siemens manual no. 21- 115527-023). 1. On the MJ-4 Control Panel, under the < DIAGNOSTICS > menu, go to the “CM Test?:” screen.

  • Page 16: Cabling The Communications Module To The Power System

    • xxx3, xxx4, or xxx5 indicate a communication problem. Contact Siemens for assistance. 7 Cabling the Communications Module to the Power System Connect the communications modules using the recommended cable as described in sections 7.1 to 7.3 below. The following sections provide some general guidelines for cable selection and explain the different cable parameters.

  • Page 17: Fiber Optic Connections

    MJ-4 Communications Module 7.1.3 Fiber Optic Connections When making connections to the transmitter and receiver inputs/outputs, ensure that the transmit output from one device is connected to the receive input of the next device. Figure 7-1 shows how to insert the connector. The tip of the cable on the ST connector must be clean and free of dust.

  • Page 18: Rs-485 Connector

    7.2.3 RS-485 Connector The required connector for connecting to the MJ-4 RS-232/485 Interface is the Weidmuller Contact Screw Terminal Block BLT 5.08/8/180 or equivalent. Wire the connector as shown in Figure 7-2. This connector is supplied with the communications module and is shown in Figure 7-3. .3”...

  • Page 19: Rs-232 Connections

    MJ-4 Communications Module 4. When the Communications Module is mounted in the MJ-4 Control Panel, it is grounded internally through the MJ-4 to the equipment ground. A separate connection to the equipment ground is not required. 5. The recommended twisted-pair cable for an RS-485 bus has a characteristic impedance of 120 ohms. Any change in the type of cable, or an open-ended length of cable, creates a discontinuity in the impedance and causes a reflection.

  • Page 20: Rs-232 Multi-Drop Wiring

    Table 7-2 lists the connections that must be made to connect the RS232/485 interface to a personal computer, RTU, or other supervisory device. The MJ-4 Communications Module defaults to no-handshaking-required mode. However, the communications module asserts RTS while it transmits data, but the module will ignore the CTS input signal.

  • Page 21: Rs-232/485 Connections

    MJ-4 Communications Module Signal Signal Ground (Frame) DB25 Ground (Signal) Ground (Signal) Shell (Frame Ground) For Shielded Cable Connectors Shell (Frame Ground) Figure 7-7 RS-232 Connector Pinout 7.4 RS-232/485 Connections The screw terminal block connector is keyed for proper insertion. Figure 7-8 shows the proper connector orientation.

  • Page 22: Communications Menu Item Descriptions

    Protocol Communications Module protocol DNP3.0, 2200, 2200NOA, MJ3A A, MJ3A B1, MJ3A B2, 2179, 2179 MJ- X, 2179 5A, SPECIAL Comm Baud Communications Module baud 300, 1200, 2400, 4800, 9600, 19200 (transmission rate) Comm Parity Communications Module parity None, Odd, Even Comm Addr Communications Module address 0 –...

  • Page 23: Troubleshooting Communications Problems

    MJ-4 Communications Module This parity selection will override any default or inherent parity defined in the selected protocol. [For example, the 2200 protocol specification document defines the parity as even. The Comm Parity configuration item allows even parity to be selected, but it also permits the system designer/installer to use an alternate parity selection if desired.] Comm Address This configuration item defines the communications address for the communications module.

  • Page 24: Using Leds To Help Diagnose Communications Problems

    7.6.1 Using LEDs to Help Diagnose Communications Problems The communications module’s Txd and Rxd LEDs can be useful indicators to help isolate system communications problems. The LEDs are directly activated by the transmit and receive signals and provide an immediate indication of line activity.

  • Page 25: Setting The Dnp Points

    The DNP Configure program is used to place a custom set of user-defined DNP points on the control panel. You can obtain this program free-of-charge from your Siemens representative. After installing the program, run it and follow the steps below to set your DNP points.
  • Page 26 Two of the most popular point sets are 2.x4 set and 2.x3 set. 2.x4 is backwards compatible with versions 2.04, 2.14, 2.44, etc. Likewise, 2.x3 is backwards compatible with 2.03, 2.13, 2.43, etc. For more information about the DNP3.0 Level 2 implementation, please contact your Siemens representative. 8.2.3 2.x4...

  • Page 27: Small 2.X3

    MJ-4 Communications Module Lower Voltage Limit Local Voltage Reduction % VRC Stage1 VRC Stage2 VRC Stage3 Auto VRC1 %I Auto VRC2 %I Auto VRC set1 Auto VRC set2 Rev Bandwidth Setting Rev Reactive Compensation Rev Resistive Compensation Rev Voltage Level Rev Time Delay Fwd Bandwidth Setting Fwd Reactive Compensation...

  • Page 28: Simple

    Band, VRC, VLC status Tap Position Load Current Load Voltage Load Voltage (primary) Source Voltage Source Voltage (primary) KVAR Power Factor Analog Outputs Point # Description Op Count Total 8.2.5 Simple Binary Inputs Point # Description Auto Inhibit Status Remote Switch position Manual Switch position Binary Outputs Point #...
  • Page 29 MJ-4 Communications Module Binary Outputs Point # Description Control Raise (1=raise) Control Lower (1=lower) Remote Auto/Manual (1=block) Fwd Voltage Level (+/-.1V) (0=dec, 1=inc) Bandwidth Voltage (+/-.1V) (0=dec, 1=inc) Fwd Time Delay (+/- 5s) (0=dec, 1=inc) Fwd Reactive Comp (+/- 1V) (0=dec, 1=inc) Local Voltage Reduct (1=Active) Remote Volt Reduct (1=Active) Local Volt Reduct % (+/-.5V) (0=dec, 1=inc)

  • Page 30: Active

    Analog Outputs Point # Description Fwd Voltage Level Fwd Bandwidth Fwd Time Delay Fwd Reactive Compensation Local Voltage Reduction % VRC Stage2 Fwd Resistive Compensation 8.2.7 Active Binary Inputs Point # Description Tap Pos Known Power Flow Direction Auto Inhibit Status Neutral (U12) Signal Remote Switch position Manual Switch position...

  • Page 31: Set 7

    MJ-4 Communications Module 8.2.8 Set 7 Binary Inputs Point # Description Auto Inhibit Status Remote Switch position Manual Switch position Neutral (U12) Signal Power Flow Direction Binary Outputs Point # Description Tap Raise Tap Lower Auto Inhibit (On/Off) Analog Inputs Point # Description Tap Position...
  • Page 32 SF = 1 VRC1 contacts SF = 1 VRC2 contacts SF = 1 Remote Switch position SF = 1 Manual Switch position SF = 1 Auto Inhibit Out Status Binary Outputs Point # Scale Factor Description SF = 1 Tap Raise SF = 1 Tap Lower SF = 1...
  • Page 33 MJ-4 Communications Module SF= 10 Vload 11th harmonic, RMS SF= 10 Vload 12th harmonic, RMS SF= 10 Vload 13th harmonic, RMS SF= 10 Vload 14th harmonic, RMS SF= 10 Vload 15th harmonic, RMS SF= 10 Vload 16th harmonic, RMS SF= 10 Vload 17th harmonic, RMS SF= 10 Vload 18th harmonic, RMS...
  • Page 34 SF= 10 Vsource 6th harmonic, RMS SF= 10 Vsource 7th harmonic, RMS SF= 10 Vsource 8th harmonic, RMS SF= 10 Vsource 9th harmonic, RMS SF= 10 Vsource 10th harmonic, RMS SF= 10 Vsource 11th harmonic, RMS SF= 10 Vsource 12th harmonic, RMS SF= 10 Vsource 13th harmonic, RMS SF= 10...
  • Page 35 MJ-4 Communications Module SF = 1 KVARHR fwd lag SF = 1 KWHR Reverse SF = 1 KVARHR rev lead SF = 1 KVARHR rev lag SF = 1 Operations Count for last 24 hours SF = 1 Operations Count for last 30 days SF = 1 Month-To-Date Operations Count SF = 100...
  • Page 36 SF = 1 KVA Inst. Rev Min SF = 1 KVA Inst. Rev Max SF = 1 KW Inst. Fwd Min SF = 1 KW Inst. Fwd Max SF = 1 KW Inst. Rev Min SF = 1 KW Inst. Rev Max SF = 1 KVAR Inst.
  • Page 37 MJ-4 Communications Module SF = 10 Auto VRC #1 % Setting (%) SF = 10 Auto VRC #2 % Setting (%) SF = 1 P2 primary (from P2 PT ratio) (Volts) SF = 1 P2 secondary (Volts) SF = 1000 CT secondary (Amps) SF = 1 Current Shift (in º, relative to voltage)

  • Page 38: Communications Module Firmware Versions

    MJ-X communications module follows. For questions regarding firmware versions not included in this list, please contact your Siemens representative. Version 2.13: Contains “full set” of 370 DNP3.0 points (see 2.x3 points list in Section 8.2.9).

  • Page 39: Specifications

    MJ-4 Communications Module 10 Specifications This section contains the MJ-4 Communications Module specifications. Contained in this section are the parameters for both the fiber optic and RS-232/485 interfaces. The data provided in the fiber optic section was obtained using 62.5/125 µm cable. Typical, maximum, and minimum lengths are given for normal and long range cable lengths. Except for the maximum and minimum parameters, the numbers provided are for room temperature.
  • Page 41 Siemens Energy, Inc. P.O. Box 6289 Jackson MS 39288 21-115527-024 rev02 Manual 11/09 ©1994-2009 Siemens Energy, Inc.

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