Emerson 7400 - Manual (Page 65)

56
Series 7400 Single Phase 1+N UPS
DISPLAY MESSAGE INTERPRETATION
UPS ON
MAINTENANCE
BYPASS
INVERTER
UNSYNCHRONISED
BATTERY ON LOAD
MAINS FAILURE
LOAD ON BYPASS
This is a status warning that the load is being powered through
the maintenance bypass line and is unprotected from mains
supply abbreviations. Due to the fact that the UPS power
supplies are fed by the input circuit breaker, this message will
disappear if the input isolator is opened (and bypass isolator
opened on a split bypass system) while the load is on
maintenance bypass supply.
This warns that the inverter is not synchronised with the bypass
supply, which is normally due to a problem with the bypass
supply being outside an acceptable frequency window. Do not
switch OFF the inverter when this alarm is active or the load will
experience a 20-millisecond power break.
This is a status warning that the battery is discharging. It
normally accompanies a [MAINS FAILURE] / [BYPASS FAILURE]
or [RECTIFIER OFF OR FAILED] message.
MAINS FAILURE or mains supply out of specified acceptable
range. Do not switch OFF the inverter while this indication is
active or the load will lose its power.
This is a status warning that the load is being powered through
the static bypass line and is unprotected from mains supply
aberrations.