Alarm Explana tion
Bypass overcurrent The bypass current is outside the rated current
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
Rectifier Fault Bus voltage abnormal or battery SCR short circuit
DC Bus Overvoltage
The rectifier, inverter and battery converter shut down because the DC bus voltage is too high. The load
transfers to bypass
DC Bus Abnor. Shutdown The DC bus voltage is abnormal and results in inverter shutdown. The load transfers to bypass
Inverter Asynchronous
The output voltage and bypass voltage are misaligned in phase. This alarm resets automatically once the
condition is no longer true
Inverter Fault Inverter output voltage outside specifications. Load transfers to bypass
Inverter Relay Fail At least one of the inverter relays is opened or shorted. This fault is locked until mains power-off
Output Fuse Fail At least one of the inverter output fuses is blown
Output Volt. Abnormal At least one phase of the output voltages is abnormal
Output Overload
This alarm appears when the load arises above 105% of the nominal rating. The alarm automatically resets
once the overload condition is removed
System Overload
This alarm appears when the total load rises above 105% of the nominal rating of the parallel system. The
alarm automatically resets once the overload condition is removed
Out. Overload Timeout
The UPS overload status continues and the overload times out. When the time has expired, the load
automatically transfers to the bypass
Load Impact Transfer
A transfer to bypass occurred due to a large step load. The UPS can recover automatically. Turn on the load
equipment in stages to reduce the load impact on the inverter
Excess Auto Rexfers
The load remains on bypass power owing to excessive number of transfers that occurred within the one
hour
Excess ECO Auto Xfers
The load remains on bypass power owing to excessive number of transfers that occurred within the one
hour
Load Sharing Abnormal The UPSs in a parallel system are not sharing the load current correctly
Other Module Xfer
All UPSs in the parallel system transfer to bypass at the same time when one of them needs to transfer to
bypass. This message appears on the TOUCHSCREEN of the UPS with passive transfer to bypass
Control Power Fail The auxiliary power failure or power-off
EPO EPO button on operator control and display panel pressed or external EPO command received
Fan Abnormal At least one fan has fault
Operation Invalid
Maintenance bypass switch is closed when the parallel system is on inverter, or output switch and
maintenance bypass switch are closed when the inverter is on
LBS Active The LBS setting is active
LBS Abnormal LBS is abnormal
Table 5.4 Norm al status m essages (continued )
5 Operator Control and Display Panel
100
Vertiv™ Liebert® EXM2 UPS User Manual
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