36
10
Troubleshooting
This section gives information about the procedures which shall be performed in case of abnormal
operation. If you fail to fix the problem consult authorized technical service with the following
information:
Model and serial number of the UPS, which can be found on the nameplate on the rear of the
UPS. This information is also available in the test report provided with the UPS.
ALR and ST codes in the ALARMS menu
Hazardous voltage and high temperature metal parts inside even if the UPS is disconnected.
Contact may cause electric shock and burns. This unit is to be served by authorized technical
personnel only.
Alarms and problems you may encounter during operating the UPS are given in the table below.
If you have noticed an abnormality in operation; check the protective earth connections, examine the
circuit breaker positions, read alarms from the ALARMS menu and refer to the table. Apply all
suggestions corresponding to each alarm. If your issue is excluded or the suggested actions do not solve
your problem, consult the technical service.
Alarm
Possible Cause
Action
BYP BAD alarm is present
Bypass mains voltage is different
than the inverter reference signal
Make sure that the bypass circuit breaker is
“I"/"ON"(if the UPS has no separate bypass
mains input, make sure that the input circuit
breaker is "I"/"ON".
(e.g. its beyond its limits or it has a
total harmonic distortion > %10)
VBYP HIGH alarm is
present
Bypass mains voltage is higher
than its upper limit
Check if the bypass mains voltage is in
specified limits
VBYP LOW alarm is
present
Bypass mains voltage is lower
higher than its lower limit
BYP SYN FL alarm is
present
Frequency of bypass mains voltage
is beyond the frequency range for
bypass operation or bypass mains
voltage is very low
BYP SEQ FL alarm is
present
Phase sequence of bypass mains
voltages is not OK
Phase sequence of the separate bypass mains
input shall be changed. Consult technical
service
MAN BYP alarm is present Manual bypass switch is "ON"
Check the position of the manual bypass
switch.
INV OVTE alarm is present
Inverter block temperature is very
high
Check if there is an overload and remove the
excessive load.
Measure the ambient temperature near UPS.
Make sure that the temperature is in specified
limits.
Check if the fans are running.
OUT OVLD alarm is
present
Rms current drawn from any of
the output lines exceeds its
nominal value
Check if there is an overload and remove the
excessive load. If the total power drawn by the
load is less than the nominal power, make sure
that it is distributed evenly between phases.
