Vertiv Liebert EXS - Page 74

Alarm/Warning Description Action
Closed
External MBB Open The external maintenance switch is opened. None required
External MIB Open The external maintenance isolating switch is opened.
Check the external breakers to ensure they are closed if
the UPS is not being serviced.
Fan Abnormal
At least one cooling fan has failed or is not operating with proper air
flow.
Contact Vertiv Technical Support.
Fault Clear Select the command of ‘Clear faults’ via the Control page. None required
Flash Operate Fail Historical record not saved. None required
Freq. Converter
Mode Active
Frequency converter mode activated. None required
Freq. Converter
Mode Enabled
Frequency converter mode enabled. None required
HMI Unauthorized The UPS does not work due to incompatible display. Contact Vertiv Technical Support.
Input backfeed A rectifier short circuit has been detected while in battery mode. Contact Vertiv Technical Support.
Input Current
Abnormal
Battery load sharing imbalance or mains battery frequent transfer
more than 5 times within 5 min.
Input Current Limit Input current over limit.
Input frequency
abnormal
The rectifier and charger are OFF due to input frequency exceeding
normal operating range.
Check the upstream input breakers to ensure they are
closed or UPS is operating from a genset.
Input neutral
missing
The UPS has detected that the input neutral conductor is missing or
has been disconnected.
Call a qualified electrician to verify the input neutral
connection or contact Vertiv Technical Support.
Input phase
reversed
The AC rectifier input phase rotation is reversed.
Call a qualified electrician to verify the input phase
rotation or contact Vertiv Technical Support.
Input Transf.
Overtemp.
The optional input transformer temperature has exceeded pre-set
limits.
Contact Vertiv Technical Support
Input Undervoltage
At least one phase main input voltage to neutral is within 96 V to 102
V, thus the load should be derated.
Input voltage
abnormal
The rectifier and charger are OFF due to input voltage exceeding
normal operating range.
Check the upstream input breakers to ensure they are
closed.
Intell. ECO Mode
Active
Intelligent ECO mode activated. None required
Intell. ECO Mode
Demo Active
Intelligent ECO demo mode activated. None required
Intell. ECO Mode
Demo Enabled
Intelligent ECO demo mode enabled. None required
Intell. ECO Mode
Enabled
Intelligent ECO mode enabled. None required
Internal MBB Closed The maintenance bypass switch is closed. The UPS is being serviced, the load is not protected.
Internal MBB Open The maintenance switch is opened. None required
Table 9.2 UPS Alarm and Warning Messages (continued)
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Vertiv™ Liebert® EXS Installer/User Guide