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Siemens MJ-X Series, Installation Manual

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Siemens MJ-X Series Installation Manual Download Page 14

MJ-X Communications Module 

10 

9.  If you are installing the RS-232/485 version of the communications module, plug the power connector into 

J411 on the MJ-X Power Board as shown in Figure 3-6. 

Processor Board

Power Board

Connector J411

Connector J105

Txd

Rxd

GND
RTN

Data

Rxd
Txd
CTS
RTS

POWER

Wdog

Comm

Membrane Switch Cable

 

Figure 3-6 MJ-X Communications Module Cable Routing 

 

10.  Feed the PDS cable through the PDS strain relief opening in the rear cover. 

11.  Reinstall the rear cover of the control panel, attaching it using the six screws. 

12.  Rotate the PDS strain-relief plate to the closed position and tighten the screws for the strain relief plate. 

13.  Follow the procedure in section 5 (Testing) to test the communications module. 

4  Installation (Version 1) 

The “Version 1” MJ-X Communications Modules install in the expansion rack accessible at the back of the MJ-X 
Control Panel. Once the expansion rack is installed, set the jumpers in the communications module for proper 
operation. Install the communications module in the expansion rack, connect the cables, and test the unit. Once 
these tasks have been performed the system is ready for operation. The following sections describe the installation 
of the expansion rack and communications module in detail. 

Summary of Contents for MJ-X Series

Page 1: ... and RS 232 485 Installation Manual POWER Watchdog Communications Rxd Txd GND RTN Rxd Txd CTS RTS Data RS 232 485 Fiber Optic Communications Module Communications Module RS 232 485 Fiber Optic Version 2 Version 1 Manual No 21 115527 013 01 ...

Page 2: ...rgize clear ground and tag circuits and equipment in accordance with established safety practices b Is trained in the proper care and use of protective equipment such as rubber gloves hard hat safety glasses or face shields flash clothing etc in accordance with established safety practices c Is trained in rendering first aid SUMMARY These instructions do not purport to cover all details or variati...

Page 3: ... INITIAL DIAGNOSTIC CHECKOUT 17 5 2 LOOPBACK DIAGNOSTIC TEST 17 6 CABLING 18 6 1 FIBER OPTIC CABLE TYPE 18 6 1 1 Fiber Optic Cable Lengths 18 6 1 2 Fiber Optic Connector 18 6 1 3 Fiber Optic Connections 19 6 2 RS 485 TWISTED PAIR CABLE 19 6 2 1 RS 485 Cable Type 19 6 2 2 RS 485 Cable Grounding 19 6 2 3 RS 485 Connector 20 6 3 RS 232 CONNECTIONS 20 6 3 1 RS 232 Multi drop Wiring 21 6 4 RS 232 485 C...

Page 4: ...SSOR BOARD JUMPER SETTINGS 15 FIGURE 4 7 VERSION 1 MODULE INSTALLATION 16 FIGURE 6 1 FIBER OPTIC CONNECTIONS 19 FIGURE 6 2 RS 485 CONNECTION 20 FIGURE 6 3 SCREW TERMINAL BLOCK CONNECTOR 20 FIGURE 6 4 RS 232 MULTI DROP CONFIGURATION 21 FIGURE 6 5 RS 232 CONNECTOR PINOUT 22 FIGURE 6 6 SCREW TERMINAL CONNECTION 22 FIGURE 6 7 MJXPLORER TROUBLESHOOTING CONNECTIONS 26 Tables TABLE 3 1 FIBER OPTIC VERSIO...

Page 5: ...ailable with either a fiber optic or RS 232 485 interface Figure 1 1 illustrates the Version 2 Communications Modules Figure 1 2 illustrates the Version 1 Communications Modules to be discontinued mid 1999 The fiber optic module enables connection of the tap changer control panel to the supervisory equipment via multi mode fiber optic cable The RS 232 485 module enables connection of the tap chang...

Page 6: ...e LED indicators Power indicates the MJ X Communications Module is powered on Watchdog Wdog blinks steadily to indicate the MJ X Communications Module microprocessor and software are functioning properly Communications Comm indicates communications activity with this module Receive Data Rxd indicates the communications module is receiving data Transmit Data Txd indicates the communications module ...

Page 7: ...sion The advantage of wire transmission is simple installation The MJ X supports two popular wire interfaces RS 232 and RS 485 The screw terminal block connector supplied with the module can be wired for either interface Connection to the supervisory device is typically accomplished using either a DE 9 or DB 25 connector for RS 232 while the connector used for RS 485 will vary with the application...

Page 8: ...Siemens publication SG 6028 Installing the ACCESS System The following characteristics determine the maximum length and data rate of an RS 485 network Impedance The maximum transfer of energy occurs when the cable s terminating impedance matches the characteristic impedance of the cable If the cable s characteristic impedance is 120 ohms use a 120 ohm terminating resistor Capacitance Wire capacita...

Page 9: ... 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 The MJ X Communications Module supports the following protocols Distributed Network Protocol DNP 3 0 Based on the IEC 870 5 Standard The Data 2200 Protocol with or without address byte MJ 3A Format A B1 and B2 The 2179 Protocol Based on the PG E Pr...

Page 10: ... Fiber Optic version and RS232 485 version are described in separate sections below 3 1 1 Fiber Optic Version The jumper locations on the fiber optic version are shown in Figure 3 1 The view of the module is from the component side The fiber optic receiver RX and transmitter TX are shown for reference The jumper settings are listed in Table 3 1 Set Auto Repeat to no repeat when only one unit is in...

Page 11: ...mponent side Jumpers and their default settings are listed in Table 3 2 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 disconnected unless required by safety codes to prevent ground loop currents Table 3 2 RS 232 485 Board Jumper Sett...

Page 12: ...le 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 This will not be used 6 Mount the communications module printed circuit board to the MJ X base with six 6 32 x 7 16 standoffs Figure 3 4 Ensure...

Page 13: ...ions Module Installation MJ X Control Panel Processor Board Communications Module Membrane Switch Cable Figure 3 5 Membrane Switch Cable Routing 7 Mount the communications module cover plate with six 6 32 x 3 8 screws as shown in Figure 3 4 8 Plug the ribbon connector into J105 on the MJ X Processor Board as shown in Figure 3 6 ...

Page 14: ...e six screws 12 Rotate the PDS strain relief plate to the closed position and tighten the screws for the strain relief plate 13 Follow the procedure in section 5 Testing to test the communications module 4 Installation Version 1 The Version 1 MJ X Communications Modules install in the expansion rack accessible at the back of the MJ X Control Panel Once the expansion rack is installed set the jumpe...

Page 15: ... strain relief on the rear cover and rotate the strain relief plate to the open position Figure 4 1 Expansion Cover Plate PDS Strain Relief Plate Rear Cover Figure 4 1 MJ X Control Panel Rear Cover 3 Remove the six screws on the side of the rear cover that hold it to the control panel 4 Feed the PDS cable harness through the strain relief cutout while removing the rear cover 5 Remove the expansion...

Page 16: ...ontrol Panel Expansion Rack Membrane Switch Cable Top View Figure 4 3 MJ X Membrane Switch Cable Routing 8 Plug the expansion rack cable into connector J105 on the control panel processor board as shown in Figure 4 2 9 Tighten the six screws holding the expansion rack to the control panel 10 Feed the PDS cable through the PDS strain relief opening in the rear cover 11 Reinstall the rear cover of t...

Page 17: ...4 1 Remove the two screws on the left side of the module case to access the circuit board Ensure end to end compatibility by setting all TX and RX jumpers to mark 0 or mark 1 see Table 3 1 If one is set to mark 0 while the other is at mark 1 the fiber optic unit will act as an inverting repeater and will not transmit correctly If this occurs check the jumpers and retry transmission Set Auto Repeat...

Page 18: ...hown in bold text Note 2 If 50 125 µm cable is used J607 must be jumpered In See section 4 1 for details 4 2 2 RS 232 485 Board The RS 232 485 transceiver board must be configured to enable proper communications between devices There are two jumpers to be configured The jumpers and their default settings are listed in Table 4 2 Figure 4 5 shows the jumper locations on the RS 232 485 board viewed f...

Page 19: ...ory set and should not be adjusted Figure 4 6 shows the location of the jumpers They should be factory set to the positions listed in Table 4 3 To gain access to the circuit board remove the two screws on the left side of the module case Table 4 3 Microprocessor Board Jumper Settings Jumper Position J505 1 2 J506 2 3 J507 1 2 J505 J507 J506 1 2 3 1 2 3 1 3 5 Figure 4 6 Microprocessor Board Jumper ...

Page 20: ...the module as follows to ensure proper operation and performance 1 Visually inspect the MJ X Communications Module for proper mechanical assembly and cable connections 2 Apply power to the MJ X Control Panel and observe the LEDs on the communications module The Power LED should light immediately and stay lit After 10 to 15 seconds the Watchdog LED should start flashing without a long pause between...

Page 21: ...n internal problem with the MJ X Communications Module Contact Siemens for assistance 5 2 Loopback Diagnostic Test The loopback test evaluates the MJ X for communications readiness For this test connect the transmit output to the receive input of the communications module When testing the fiber optic module ensure that the cable used meets the requirements outlined in section 6 1 When testing the ...

Page 22: ...to the coupling efficiency of the cable which at short lengths will overload the optical receiver In addition the large cable attenuation normally associated with plastic cable limits the useful link lengths to a fraction of that achievable with glass cable 6 1 1 Fiber Optic Cable Lengths Calculate cable length by determining the output power of the transmitter PTX and the input receive level Peak...

Page 23: ...stics necessary for proper electrical performance in an RS 485 communications network Use cable with a shield that provides 100 percent RFI EMI coverage Table 6 1 RS 485 Cable Specifications Characteristic Value Maximum Typical Impedance 120 ohms Typical Capacitance pF ft 35 Maximum Cable Size 22 AWG Typical DC Resistance 17 ohms 1000 ft Maximum Velocity of Propagation 80 Maximum 6 2 2 RS 485 Cabl...

Page 24: ...e 6 3 3 12 Gauge Wire Maximum Phoenix Contact Connector COMBICON MSTB2 5 8 ST 5 08 Figure 6 3 Screw Terminal Block Connector 6 3 RS 232 Connections The following section describes the connection requirements for RS 232 cable This cable will allow you to connect the MJ X Control Panel to an RTU or personal computer Five of the standard RS 232 wires are used for this application Signal Return RTN RX...

Page 25: ...ut for the DTE and an input for the DCE Personal computer serial ports are configured as DTE and the modems are configured as DCE The communications module RS 232 connections implement DTE 6 3 1 RS 232 Multi drop Wiring Multi drop configurations require that the respective pins of the DTE devices be connected in parallel Figure 6 4 The standard pin assignments for RS 232 connectors are shown in Fi...

Page 26: ...e GND RTN Data Rxd Txd CTS RTS Figure 6 6 Screw Terminal Connection 6 5 Communications Module Configuration Prior to using the MJ X Communications Module in the network the communications module needs to be configured properly for communications The COMMUNICATIONS menu of the MJ X Control Panel provides all the required communications configuration items for the communications module Table 6 4 lis...

Page 27: ...ort status Not Applicable This is a Status Item DatPortBaud Data Port baud in bits second 300 1200 2400 4800 9600 19200 Data Parity Data Port parity None Even Reg Id Regulator Identification 0 32 766 Protocol Communications Module protocol DNP3 0 2200 2200NOA MJ3A A MJ3A B1 MJ3A B2 2179 2179MJ X 2179 5A SPECIAL Comm Baud Communications Module baud transmission rate 300 1200 2400 4800 9600 19200 Co...

Page 28: ...e system 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...

Page 29: ...ule Configuration 6 6 2 Using MJXplorer to Troubleshoot Communications Problems The MJXplorer software is a menu driven application program that allows interfacing to the MJ X Communications Module Since the current version of MJXplorer does not support networking only one MJ X unit may be connected at a time For connecting an MJ X Fiber Optic Communications Module to MJXplorer the Fiber Optic aut...

Page 30: ...cations Module specifications Contained in this section are the parameters for both the fiber optic and RS 232 485 module 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 The maximum and mi...

Page 31: ... Type Glass 62 5 125 µm 5dB m Data Rate 5 Mbaud design 19 2 Kbaud tested Maximum Optical Power Budget 11 dBm Long Range 8 dBm Normal Range Typical Optical Power Budget 8 dBm Long Range 5 dBm Normal Range Minimum Optical Power Budget 4 dBm Long Range 1 dBm Normal Range Link Lengths Maximum Link Length 2 2 km Long Range 1 6 km Normal Range Typical Link Length 1 6 km Long Range 0 6 km Normal Range Mi...

Page 32: ......

Page 33: ...Power Transmission Distribution LLC P O Box 6289 Jackson MS 39288 21 115527 013 01 Manual 6 99 1994 1999 Power Transmission Distribution LLC ...

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