Siemens MJ-X Troubleshooting Manual
Voltage regulator
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Also See for MJ-X:
- Installation and operation manual (80 pages) ,
- Installation manual (34 pages)
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MJ-X
Troubleshooting Guide
Siemens Power Transmission & Distribution
Proprietary Information
[AED-000025-04]
Revision History
Document Revision 04: 5 January 98 -
Document number (AED-000025-04) added.
Document Revision 03: 14 July 97 -
This document was created from an original troubleshooting guide (dated May 93).
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Summary of Contents for Siemens MJ-X
- Page 1 MJ-X Troubleshooting Guide Siemens Power Transmission & Distribution Proprietary Information [AED-000025-04] Revision History Document Revision 04: 5 January 98 - Document number (AED-000025-04) added. Document Revision 03: 14 July 97 - This document was created from an original troubleshooting guide (dated May 93).
- Page 2 PDS connections are hot.} For tap motor direction sensing with the MJ-X, the “J” and “K” jack plug signals must have a minimal resistive load. If you’re not using the MJ simulator, connect load resistors (2.2K 10W) from J to E and K to E at the PDS (jack plug).
- Page 3 180° out-of-phase, respectively. For tap motor direction sensing with the MJ-X, the MJ simulator must include load resistors (2.2K 10W) from J to E and K to E. Check if your MJ simulator has these resistors. If your simulator lacks these resistors, add them.
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Page 4: Symptom Based Troubleshooting
Note: The (local) data port should be jumpered as "DCE" for connecting to a terminal device (such as a notebook or laptop computer) when using a straight-through cable. The (local) data port should be jumpered as "DTE" for connecting to a modem when using a straight-through cable. Refer to MJ-X Application Note 5 for further information. -
Page 5: Troubleshooting Overview
Lower in Auto/Remote Auto Inhibit active? Low Current Inhibit active? >> Verify Solid State Relay. (Substitute known good part.) Set MJ-X R/A/M switch to Remote. With MJXplorer, perform “Raise/Lower”. Verify J/K signal activates. Won’t Raise/Lower in PDS J/K go active for Manual Raise/Lower attempt? Switches SW401&... - Page 6 Diagnose system and control panel problems using the Alert Messages and the table below. Rule out “Normal Causes” first. Troubleshoot starting with “Problem Causes” and “What to Check”. System transients may produce MJ-X Alert messages. If possible, determine if this is the case before proceeding with an in-depth troubleshooting effort.
- Page 7 (e.g., log and min./max. data). RAM failures produce varying symptoms. For complete failure, the MJ-X program will not run, and the MJ-X will appear “dead” with the exception of display flickering when you power it. For loss of non-volatile data, the MJ-X clears all RAM-stored non- volatile data, and reports this in the Alert message “NV RAM Reset”.
- Page 8 The MJ-X displays: "Test Code XXXXXX", where XXXXX is the backdoor test date code. Keypad Test Set the Remote/Auto/Manual (“R/A/M”) switch to Remote or Manual. Press any key. The MJ-X displays the key’s name. Press the same key multiple times. The MJ-X alternately displays the key name and a blank screen. Remote/Auto/Manual Test Toggle the Remote/Auto/Manual switch.
- Page 9 [Set the Remote/Auto/Manual switch to Auto. Press the Voltage Limit Control key.] The MJ-X reads its MPU reset status register and displays the reset type, abbreviated as: "X" = external, "P" = power up, "W" = watchdog, "H" = halt, "C" = loss of clock, "S" = system, and "T" = test module.
- Page 10 AED-000025-04 11. “Backdoor Mode” Summary 1. For MJ-X Main Processor software versions prior to 2.30: Adjust input voltage or the MJ-X Voltage and Bandwidth setpoints to achieve an in-band condition—i.e., deactivate J and K outputs. 2. Display the "Data Stat = XXXX" screen under the <COMMUNICATIONS> menu.