Table Of Contents
System Troubleshooting
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
Error Message Distribution Fuse/Breaker Failure (Red light on controller, Relay #4)
Explanation
1. Tripped breaker
2. Fuse blown
Recommended Action
1. Localize the faulty breaker or blown fuse
2. Verify there are no short circuits in the cabling to the load
3. Reset breaker. If it trips again there is a problem with the breaker or the load
4. Replace breaker if required
5. Verify that there is no blown fuse. (If so, replace the blown fuse.) If the fuse blows again, there may be a problem with the load
Note Due to proprietary alarm wiring, a voltage will appear at the load terminal of the fuse even when the fuse is open. The voltage comes from a high impedance circuit used for blown fuse detection when a load is connected. This is not an energy hazard.
Error Message High Load (Yellow light on controller)
Explanation Load current exceeds 75%
Recommended Action
1. Check load current versus installed rectifier capacity. The alarm is generated when output load reaches 75% of rectifier capacity.
2. Add rectifier or reduce load.
Error Message Module Failure (Red light on controller and Module, Relay #3)
Explanation
1. Module failure
2. AC Off on a single rectifier
3. Current sharing fault
Recommended Action
1. Verify that the AC supply to the failed module is present at the right voltage.
2. Remove the faulty module, wait 30 seconds, and re-insert it. Wait up to four minutes for the controller to re-establish communication. If the module is still faulty, replace it with a new module.
3. Verify module address and resolve any address duplication ( Figure 5-1). Rectifier address DIP switches are located at the inside rear of the rectifier shelf.
Figure 5-1 Module Locations
Note Sometimes the rectifier that indicates a failure is not the cause of the failure. The failure may be caused by a current share imbalance. If the failure persists even after replacing the rectifiers showing a fault, replace each rectifier in turn with a known good unit until the fault clears. The replaced module that clears the fault is the defective one.
Error Message Urgent Module Failure (Red light on controller, Relay #3)
Explanation More than one rectifier is reporting a module failure.
Recommended Action See module failure.
Error Message Communication Failure (Yellow light on controller, flashing yellow
light on module)
Explanation
1. Controller is looking for the installed module
2. A module has been removed and not replaced
3. Broken or disconnected communication wire
Recommended Action
1. Wait for 5 minutes.
2. Verify that the module address is properly set and is not a duplicate of another address ( Figure 5-1). Rectifier address DIP switches are located at the inside rear of the rectifier shelf.
3. Verify that the communication cable at the back of the rectifier shelf is connected.
4. Replace communication cable if required.
