| Product | Powerware 9315 80kVA |
| Application | IT – Datacenter |
| Synopsis | During regular preventive maintenance, found the input currents to be imbalanced as opposed to being balanced on previous preventive maintenance visit. |
| Preliminary Actions | In performing further checks, and looking at the input currents at the input filter capacitors, found 0 amps of current on Phase ‘C’. Performed further checks and while looking through the top of the unit, discovered insulating wrap on the Phase ‘C’ of input inductor significantly burned. |
| Resolution | Took the unit to Bypass Mode and isolated the [optional] Input Filter circuit by disconnecting contactor K6 in order to remove current flow through the inductor. |
| Root Cause | Failed / faulty input capacitors going out of tolerance and causing excess heat at the inductor connection, or, failed / faulty input inductor. |
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