Alarm Explanation
Manual Battery Test User initiates battery maintenance discharge test (20% capacity discharge).
Rectifier DSP Update Upgrading rectifier DSP software.
Inverter DSP Update Inverter DSP software is being upgraded.
Inverter FPGA Update Upgrading inverter FPGA software.
Bypass DSP Update Upgrading bypass DSP software.
Bypass FPGA Update Upgrading bypass FPGA software.
HMI Update Upgrading monitoring software.
Remote Turn On Turn on the inverter through the service command.
Remote Turn Off Turn off the inverter through the service command.
Batt. Equalize Charge The battery is forced to be in boost charge state.
Equalize Chg. Timeout The actual float charging time exceeds the time set by the setting software.
Battery Test Fail Battery test failed.
Battery Test Stopped Battery test stopped.
Load on Maintenance Bypass The maintenance bypass is closed and the load is supplied.
Inverter On Cancel Inverter on cancel.
Inverter On Fail Power on failure, possibly due to invalid operation (eg service switch closed), DC bus or rectifier not ready.
MonCAN Comms. Abnormal Communication failure between internal supervisory board and inverter, rectifier, bypass.
ParaMonCAN Comms. Abnormal Communication failure between internal inverter, rectifier, bypass.
PowerCAN Comms. Abnormal ParaPowerCAN communication between bypass and bypass fails.
Discrete Bus Comms. Abnormal
The discrete bus communication in the rack is abnormal, it is recommended to check whether the
communication cable connection on the back of the rack is reliable.
ParaDiscrete Bus Comms. Abn.
The discrete CAN communication between the bypass and the bypass fails, it is recommended to check the
parallel cable and the bypass board.
Batt. System Comms. Abnor. The MODBUS communication between UPS and BMS is abnormal.
Ambient Overtemperature Ambient temperature over-temperature detection, can be set.
Control Power Fail Auxiliary power failure or brownout.
Fan Abnormal At least one power module fan has failed.
Bypass SCR Fan Abnormal At least one bypass module fan has failed.
Operation Invalid
User operation error (for example, the maintenance switch is closed when the inverter is outputting in parallel,
the output switch and the maintenance switch are closed after the inverter is turned on).
On Generator Dry contact signal, indicating that the generator is connected.
Input Switch Open Input circuit breaker is disconnected.
Maint. Switch Open Maintenance switch disconnected.
QBPOpen External maintenance circuit breaker disconnected.
Table 5.4 Alarm List (continued)
96 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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