Cisco AC/DC red led alarm on controller

[filterfilter]

Hi,

We are using Cisco AC/DC power supply for ONS 15454. We found there is an alarm warning ( red LED ) on the cisco AC/DC controller, but no alarm on all rectifiers.

We are trying to verify the connectivity and power to each rectifier,  problem is im not that good with electricity, how do we do that? is there any guidelines or anything ? and does doing that could affect on our ONS ?

Thanks

[scnoyes · Accepted solution]

The red LED alarm indicator on the Cisco AC/DC Power System can have multiple meanings.  Below are descriptions of the various error conditions indicated by the red LED and possible cause of the trouble along with some recommendations on how to resolve the issue.

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Error Condition:        Low System Voltage

Alarm Indicator:        Red light on controller; Relay #1 is active

Possible Cause:         1. Rectifier module failure.

                                 2. Loss of AC power on some or all rectifiers modules.

                                 3. Load exceeds rectifier capacity.

Recommended Action:     1. Replace any faulty rectifier modules.

                                      2. Add one or more rectifiers modules to the system.

Error Condition:        Distribution Fuse/Breaker Failure

Alarm Indicator:        Red light on controller; Relay #4 is active

Possible Cause:          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 Condition:        Module Failure

Alarm Indicators:       Red light on controller and red light on rectifier Module; Relay #3 is active

Possible Cause:         1. Rectifier module failure.

                                 2. AC Off on a single rectifier module.

                                 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 rectifier module, wait 30 seconds, and re-insert it. Wait up to

                                          four minutes for the controller to re-establish communication. If the rectifier module

                                          is still faulty, replace it with a new rectifier module.

                                      3. Verify rectifier module address and resolve any address duplication. Rectifier address

                                          DIP switches are located at the inside rear of the rectifier shelf (see Figure 5-1 below).

Note: Sometimes the rectifier module 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 module in turn with a known good unit until the fault clears. The replaced rectifier module that clears the fault is the defective one.

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.

Hope this helps,

Steve Noyes

CSE Cisco TAC