Power Supply Faults

Power supply units (PSUs) monitor their own fault status and control their own Service Action Required LEDs; fault management has no control over the PSU LEDs. However, when a PSU fault occurs, fault management illuminates the chassis Service Action Required LEDs to indicate that the PSU has faulted. Thus, you may want to think of PSUs as having two independent fault conditions: the status of the fault as the PSU itself assesses it, and the PSU's fault status as monitored by the fault management software running on the CMM.

It is possible for a PSU to extinguish its Service Action Required LED (when it no longer detects the error condition) but for fault management to continuing reporting the PSU fault. In this case, fault management cannot determine whether the original cause of the fault has been corrected. In such a case, you (or Sun Field Service) may need to assess the situation to determine if any corrective action needs to be taken.

The following faults can occur on power supply units:

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