| Product | Liebert NX Series UPS |
| Application | Military / Datacenter |
| Synopsis | Client found the alarms / condition of unit as: UPS in bypass, Inverter operating, unit unable to transfer online. |
| Preliminary Actions | The client had a power outage, and the load was protected and switched to the generator. However, after the power was restored, the UPS would not come back online from bypass. |
| Resolution | Replaced blown output fuse along with other output fuses, tested UPS, placed system back online. |
| Root Cause | One of the tape drives in the data center had a faulty / shorted power supply which was detected on the output of the UPS, enough so that it cleared an Output fuse on the UPS. The UPS protected itself by clearing the fuse prior to allowing further damage to the Inverter. Note that periodic inspections should also be considered for the end user’s data center servers / tape drive equipment to insure proper operation within specifications. |
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