Case Study

Case Study #107 | Rotation Alarm

May 2, 2016 | Case Study

Product Eaton 9315 225kVA
Application Restart
Synopsis Alarms being generated:

– “Phase Rotation”
– “Bypass Over Voltage”
– “UPS OFF”

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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