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990-1599B Smart-UPS® VT 10-30 kVA, 208/220 V and XR Battery Enclosure Operation Manual 17
Display Messages/Troubleshooting
This section lists the status and alarm messages that the UPS might display. The messages are listed
in alphabetical order, and a suggested corrective action is listed with each alarm message to help you
troubleshoot problems.
Display messages
Display message Meaning Corrective action
Automatic Self Test
Started.
The UPS has started pre-programmed
battery test.
No corrective action necessary.
Batt Temperature
Exceeded Upper Limit.
The temperature of one or more bat-
tery units has exceeded system
specifications.
Contact APC Customer Support.
See rear cover.
Battery over-voltage
warning.
The battery voltage is too high and
the charger has been deactivated.
Contact APC Customer Support.
See rear cover.
Bypass Not Available
Input Freq/Volt Out Of
Range.
The frequency or voltage is out of
acceptable range for bypass. This
message occurs when the UPS is
online, and indicates that the bypass
mode may not be available if
required.
Correct the input voltage to provide
acceptable voltage or frequency.
Discharged Battery. The UPS is in battery operation and
the battery charge is low.
Note: Runtime is limited in duration.
No corrective action necessary. Shut
down the system and the load
equipment or restore incoming
voltage.
Emergency PSU Fault. Redundant Emergency Power Supply
Unit (PSU) is not working. The UPS
will continue to work normally, but
the PSU should be replaced.
Contact APC Customer Support. See
rear cover.
EPO Activated. Emergency Power Off Switch has
been activated.
Deactivate Emergency Power Off
Switch.
Fan fault. A fan has failed. Contact APC Customer Support. See
rear cover.
Int. Mech. Bypass
Switch Closed.
The internal mechanical switchgear is
closed.
No corrective action necessary. The
UPS is in internal mechanical bypass
operation.
Int. Mech. Bypass
Switch Open.
The internal mechanical switchgear is
open.
No corrective action necessary.
Low-Battery. The UPS is in battery operation and
the battery charge is low.
Note: Runtime is limited in duration.
Shut down the system and the load
equipment or restore incoming volt-
age.