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CHAPTER
5-1
Cisco AC/DC Power System User Guide, R1.0
May 2006
5
System Troubleshooting
This chapter contains information about troubleshooting and should be consulted in the event of a system
malfunction.
The following is a list of potential problems and resolutions. If the first recommendation does not solve
the problem, continue on to the next. If further assistance is needed, see the “Obtaining Technical
Assistance” section on page xiv.
Warning
Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Statement 1030
Note Most alarms will clear automatically when the cause has been cleared. Some alarms can be cancelled via
the front panel push-buttons. In this case it will be indicated in the trouble shooting instructions.
Error Message Low System Voltage (Red light on controller, Relay #1)
Explanation
1.
Rectifier failure
2. Loss of AC power on some or all rectifiers
3. Load exceeds rectifier capacity
Recommended Action
1.
Replace faulty rectifier
2. Add one or more rectifiers to the system
Error Message Mains Error (Yellow light on controller, Relay #2)
Explanation
AC supply off on two or more rectifiers
Recommended Action
1.
Verify that the AC supply is available at the correct voltage
2. Verify that the AC input breaker is in the ON position