Alarm Explanation
Bypass Phase Reversed The phase rotation of the bypass voltage is reversed.
Bypass Out of Sync The bypass voltage and frequency are not within the set tracking range.
Bypass overcurrent The bypass current is outside the rated current.
Bypass STS Fail At least one of the STSs at the bypass side is open or shorted. This fault is locked until power off.
Other Bypass STS Fail The adjacent bypass STS open circuit fault or short circuit fault.
Bypass backfeed The bypass backfeed is faulty.
Bypass Overtemperature The bypass has overtemperature.
Bypass in Charge
The bypass detects an inverter signal when the system runs normally. When the output voltage is abnormal, the
system will transfer to bypass mode for power supply.
Bypass in Setting The bypass module is initialized and synchronized.
Bypass Not Available In generator mode, the bypass output is disabled.
Bypass Overcurrent Timeout When the bypass overload delay time expires, the bypass is closed.
Bypass Fuse Fail Bypass Fuse Fail.
Charger Fault Battery charger has failure.
Battery Reversed Reconnect battery and check battery wiring.
No battery The battery is not connected, check the battery insurance, check the battery and battery wiring.
Battery Overtemp. The battery temperature is over limit.
Battery Maintain The battery maintenance is required.
Low Battery
Before the EOD, battery low pre warning will occur. After this pre-warning, the battery will have the capacity for
3 min discharging with full load. The time is user-settable from 3 min to 6 min.
Batt. End of Discharge Inverter turned off due to battery EOD.
Battery Ground Fault Battery has ground fault.
Batt. Room Temp. Abn. Battery room has overtemperature (option included).
Battery Switch Box Open Battery battery switch box is opened.
Battery Switch Box Closed Battery battery switch box is closed.
Battery Switch Box Status Abnormal Logic conflict between battery switch box drive signal and backfeed signal.
Battery Reset
The battery related aging coefficient capacity information is reset, which occurs when changing battery related
configuration information or manually resetting the battery.
Battery Terminal Abnormal
There are signs of short circuit on the positive and negative terminals of the battery. Check the battery wiring,
battery and machine ports, check the battery insurance, and see if there is any trace of short circuit and arcing.
Discharger Curr. Limit Discharge current is over limit, close the discharger.
Internal Battery Switch Open The auxiliary contact of the internal battery air switch is disconnected.
Discharger Fault Bus voltage abnormal.
Balance Circuit Fault The balance circuit cannot stabilize the positive and negative bus voltage difference.
Table 5.4 Alarm List (continued)
94 Proprietary and Confidential ©2023 Vertiv Group Corp.
5 Operator Control and Display
Panel
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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