32
Bypass differ
The Main2 bypass input
of some UPS is
disconnected
Check the building wiring and input
cable. Check if the M2 breaker is
closed. Ensure the UPS are
connected to same input source
Setting differ
different setting in
parallel system
Check the setting
ECO In Parallel
ECO function is
enabled in parallel
system
ECO function is forbidden in parallel
system
7.2. Trouble Shooting According to Fault Indication
Problem Displayed
Possible Cause
Remedy
Output short
Output short circuit
Remove all the loads. Turn off the
UPS. Check if UPS output and loads
is short circuit. Ensure short circuit is
removed before turning on again.
Over load
Over load
Check the loads and remove some
non-critical loads.
Check if some loads are failed.
Neg power fail
The load is pure
inductive and capacitive
Remove some non-critical loads.
Bypass supplies the load first, ensure
there is no overload, then turn on
UPS.
Over temperature
Inside temperature of
UPS is too high
Check the ventilation of UPS and the
ambient temperature
Fan fail
Fan blocked or
disconnected over time
Check the fan status
Back feed
Output voltage is
returned to input
Consult dealer
DC short
Bus short
Consult dealer.
DC over
Bus over voltage
Consult dealer.
