Case Study #107 | Rotation Alarm
|Product||Eaton 9315 225kVA|
|Synopsis||Alarms being generated:
– “Phase Rotation”
UPS is in bypass and will not return online.
|Preliminary Actions||The technician found the rotation was correct and the “UPS OFF” alarm was being generated from bypass contactor not closing in.|
|Resolution||Traced phase rotation alarm back to the bypass transformer (CPT3). The transformer had burned itself up. Once the transformer was removed and replaced, the unit was still generating a “Bypass Over Voltage” and “UPS OFF” alarm with CB1 open. After rechecking all connections, the root cause of the alarms was traced to a bypass power supply (PS3) PCA attached to the DC capacitors. The components were replaced and the unit cam back online with no further issues.|
|Root Cause||Burned up bypass transformer (CPT3), bypass power supply (PS3) PCA.|
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