Message Description
Inverter overload
Inverter load capacity is larger than the rated value, overload delay time is up, inverter shuts down. If bypass is available,
the system will transfer to the bypass mode, otherwise the system will power off. Check the output load. If overloaded,
reduce the load, and the system will transfer to the inverter mode after five seconds with no alarm.
Inverter relay welded The inverter relay is shorted. Contact Vertiv Technical Support.
Load off due to output short A short has occurred on the output. Check the output cables and for any equipment that may have shorted.
Load off due to shutdown on
battery
The system was shut down in battery mode. This will clear when the system is turned back on.
Manual power on The system was turned on via the display panel. This will display in the log whenever the event occurs.
Manual shutdown The system was shut down via the display panel. This will display in the log whenever the event occurs.
No battery No battery detected. Check the battery and battery cable connections.
On maintenance bypass The UPS is operating in maintenance bypass mode. This will display in the log whenever the event occurs.
Operating on inverter The UPS output is being powered by the inverter. This will display in the log whenever the event occurs.
Output disabled
The system is in standby state, and the Dry contact shutdown is enabled. Check if the shutdown dry-contact is
enabled.
Output off due to bypass
abnormal
The bypass voltage or frequency is outside the acceptable range, and the bypass is in stand-by mode. Check that the
input is normal.
Output off due to overload and
bypass abnormal
The output is off due to an overload of the UPS output, and the bypass voltage or frequency is outside the acceptable
range. Check that the input is normal.
Output off, voltage is not zero
This occurs when the output is off and the system detects that there is still voltage on the output. Check output
equipment for backfeeds or contact Vertiv Technical Support.
Output pending Remote shutdown has been initiated, and the system will turn off shortly.
Output short A short has occurred on the output. Check the output cables and for any equipment that may have shorted.
Rectifier fault
The rectifier is off because the bus voltage is out of the acceptable range when the rectifier starts. Contact Vertiv
Technical Support.
Rectifier overload
The output power is larger than the rectifier overload point. Check that the input voltage meets the output load, if the
mains input falls to 176 V - 100 V, the load is derated linearly from 100% - 50%.
Remote power on The UPS was powered on remotely. This will display in the log whenever the event occurs.
Remote shut-off The UPS was powered off remotely. This will display in the log whenever the event occurs.
Remote shutdown Any mode shutdown was initiated by the dry contact input. This will display in the log whenever the event occurs.
REPO
Shutdown caused by the REPO terminal Normally Closed contact input opening. This will display in the log whenever
the event occurs.
Restore factory defaults
On the Maintenance page, Restore Factory Defaults has been set while the UPS is in the stand-by state. This will return
settings to their factory settings.
Shutdown due to over temp
During the UPS operation, the system checks if the heat sink temperature exceeds the setting range. If an
overtemperature occurs, check if:
1. The ambient temperature is too high.
2. Dust is blocking any of the UPS vents.
3. A fan fault has occurred.
Table 5.4 Alarm Messages (continued)
5 Operation and Display Panel Proprietary and Confidential ©2024 Vertiv Group Corp. 71
Vertiv™ Liebert® GXT5 UPS Installer/User Guide
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