Message Description
Battery reversed The battery positive and negative are reversed. Reconnect the battery and check the battery cable connections.
Battery test fail
The remaining energy at the end of the periodic or manual self-test was deemed lower than acceptable. Battery
replacement is recommended.
Battery test started The battery periodic self-test or manual self-test was started. This will display in the log whenever the event occurs.
Battery test stopped The battery periodic self-test or manual self-test has finished. This will display in the log whenever the event occurs.
Battery to utility transition
The UPS has transferred the load to the mains power from the battery. This will display in the log whenever the event
occurs.
Battery voltage abnormal The battery voltage exceeds the normal range. Check if the battery terminal voltage exceeds the normal range.
Bypass abnormal
May be caused by bypass voltage and frequency outside of range, bypass power off and incorrect bypass cables
connection.
Check that the bypass voltage and frequency are within the setting range.
Check the bypass cables connection.
Bypass abnormal in ECO mode
May be caused by ECO bypass voltage and frequency outside of range, ECO bypass power off, and incorrect ECO
bypass cables connection. Check that the ECO bypass voltage and frequency are within the setting range. Check the
bypass wiring.
Bypass mode The UPS is on bypass. This will clear when the UPS returns to Normal mode.
Bypass over-current The load is drawing more current than the UPS is rated to supply in bypass mode. Reduce the load.
Charger fault The charger output voltage is abnormal, and the charger is off. Contact Vertiv Technical Support.
Communication fail Internal communication is abnormal. Check that the communication cables are connected correctly.
DC bus abnormal
The inverter is off due to DC bus voltage out of acceptable range. The load will transfer to bypass if the bypass is
available because the bus voltage is outside of the acceptable range.
DC/DC fault
The discharger is faulty, because the bus voltage exceeds the range when the discharger starts. Contact Vertiv
Technical Support.
EOD turn off The inverter is off due to EOD. Check the mains power off state and recover the mains in time.
Fan fault At least one fan is faulty. Check if the fan is blocked or the cable connection is loose.
Faults cleared
The faults have been cleared using Settings > Controls > Clear faults. This will display in the log whenever the event
occurs.
Guaranteed shutdown
The battery has finished discharging, then system shuts down because Guaranteed Shutdown is enabled (see
Guaranteed shutdown on page64). This alarm will clear when the UPS is turned on again.
Input abnormal
The rectifier and charger are off due to the mains voltage and frequency exceeding normal range. Check if the input
voltage and frequency are within the normal range or if the mains input has gone down.
Input ground lost Check that the PE line is well connected and that the alarm can be cleared at the display.
Input neutral lost The mains input neutral is not detected. The alarm will clear when the neutral connection has been restored.
Input phase reversed The mains input line and neutral are reversed. Shut off external input breaker and connect the lines correctly.
Insufficient capacity to start
The UPS is on bypass and is started with a load greater than 105% of the rated capacity. Reduce the load to the rated
capacity or below to start the unit.
Inverter fault
The inverter is turned off when the inverter output voltage or current exceed the ranges set. If bypass is available, the
UPS will transfer to bypass mode, otherwise the system will power off. Contact Vertiv Technical Support.
Table 5.4 Alarm Messages (continued)
70 Proprietary and Confidential ©2024 Vertiv Group Corp. 5 Operation and Display Panel
Vertiv™ Liebert® GXT5 UPS Installer/User Guide
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