Alarm Explanation
QOP Open External maintenance isolation circuit breaker disconnected.
Maint. Switch Closed Maintenance switch closed.
QBP Closed External maintenance circuit breaker closed.
Output Switch Open Output switch open.
QE Open The external output circuit breaker is disconnected.
Bypass Switch Open Bypass switch open.
System Interrupt Transfer Intermittent switching is performed when the bypass is super tracking and the inverter is not phase locked.
Parallel Cable Abnormal Parallel cable connection is abnormal.
LBS Cable Abnormal Abnormal LBS cable connection.
Loss of Redundancy Loss of redundant capacity.
MMS Capacity Exceeded
When the output load of the N+X parallel system is greater than N, the alarm prompts that the input and output
switches and cables are bearing more than the designed rated power.
LBS Active LBS is enabled.
LBS Abnormal LBS is abnormal.
Rectifier DSP SW Error
There is an error in the DSP program of the rectifier control board. It may be that other programs such as
inverter or bypass DSP have been recorded.
Inverter DSP SW Error
There is an error in the DSP program of the inverter control board. It may be that other programs such as
rectification or bypass DSP have been recorded.
Inverter FPGA SW Error
There is an error in the FPGA program of the inverter control board. It may be that other programs such as the
bypass FPGA have been recorded.
Bypass DSP SW Error
There is an error in the DSP program of the bypass control board. It may be that other programs such as
rectification or inverter DSP have been recorded.
Bypass FPGA SW Error
There is an error in the FPGA program of the bypass control board. It may be that other programs such as the
inverter FPGA have been recorded.
Power Hardware Mismatch The model information set in the background is inconsistent with the actual.
Parameter Config. Fail DSP configuration EEPROM operation failed, or MON failed to deliver DSP parameters.
Input Transf. Overtemp Input Transformer Overtemperature.
Module Overtemperature The rectification and inverter power tubes in the module are overheated.
Charger Overtemperature The power tube of the charger in the module is overheated.
Balance Circuit Overtemp Balance circuit power tube radiator over temperature.
Module in Sleeping
When the module is in sleep mode, the inverter does not work. Only the machines with smart parallel mode or
smart parallel demonstration mode have this state.
Module Comms. Normal Monitor and module communication is normal.
ECO Mode Enabled The machine is configured in ECO mode.
ECO Mode Active The machine works in ECO mode.
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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