Alarm Explanation
Balance Circuit Overcurrent Balance circuit current exceeds wave by wave current limit.
Charger Shutdown Dry contact signal, the dry contact gives the charger shutdown command, and the charger will shutdown.
Battery Voltage High
When the battery is connected, it is detected that the battery voltage exceeds the high voltage range. Check if
the battery terminal voltage is out of the normal range.
Battery Deep Discharge Alarm
In CPSS applications, the battery discharge reaches the termination voltage, the battery stops discharging, and
the inverter shuts down.
Battery Voltage Low
The battery voltage is too low, which is caused by the wrong configuration of the number of battery cells or a
problem with the battery.
Batt. Temp Sensor Abnor.
The difference of the battery temperature detection point is too large, or the temperature detection is out of
range, or the temperature detection communication is abnormal.
Discharger Shutdown
The arrester needs to be turned off in the case of non arrestor failure, and the arrester needs to be turned off if
the joint power supply state is not required.
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.
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.
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 Fuse Fail At least one phase module inverter relay or open fuse fault.
Output Voltage Abnormal Abnormal output voltage of at least one phase.
Fault Clear Operator control panel fault clear command options.
Silence Active Operator control panel alarm mute command options.
Silence Inactive SILENCE ON/OFF key on the operator control and display panel pressed in alarm silence state.
Inverter Manual On INVERTER ON key on the operator control and display panel pressed to turn on the inverter.
Inverter Manual Off INVERTER OFF key on the operator control and display panel pressed to turn off the inverter.
Autostart After UPS shutdown at EOD, the inverter automatically starts upon mains restoration.
EPO EPO button on operator control and display panel pressed or external EPO command received.
Load on Bypass UPS is in bypass mode.
Load on Inverter
The UPS is in normal mode, that is, the input is in the main power supply mode, and the output is in the inverter
power supply mode.
Load on Battery
The UPS is in battery power supply mode, that is, the input is in battery discharge mode, and the output is in
inverter power supply mode.
Load Off The UPS shuts down, and the bypass and inverter have no output.
Output Disabled EOD event happened. Check the battery voltage.
Automatic Battery Test Regular automatic battery maintenance discharge test in progress (20% capacity discharge).
Calibrated Battery Test The user starts the battery capacity discharge test (100% capacity discharge).
Table 5.4 Alarm List (continued)
5 Operator Control and Display
Panel
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Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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