User`s manual

UPS EVO DSP TT 31 User’s manual
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 breakers 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 to solve
BYP BADSHAPE
Bypass mains voltage is different
than the Inverter reference signal
(e.g. its frequency is beyond
synchronization limits or it has a
total harmonic distortion > 10%).
Make sure that the Bypass circuit breaker is
“ON”/“1” (if the UPS has no separate Bypass
mains input, make sure that the Input circuit
breaker is “ON”/“1”.
BYP VOL HIGH
Bypass mains voltage is higher
than its upper limit.
BYP VOL LOW
Bypass mains voltage is lower
higher than its lower limit.
BYP SYN FAIL
Frequency of Bypass mains voltage
is beyond the frequency range for
Bypass operation or Bypass mains
voltage is very low.
Check if the Bypass mains voltage is in
specified limits.
BYP SEQ FAIL
Phase sequence of Bypass mains
voltages is not OK.
Phase sequence of the separate Bypass mains
input shall be changed. Consult Technical
Service.
MNBYP SW ON
Manual Bypass circuit breaker is
“ON”/“1”.
Check the position of the manual Bypass circuit
breaker.
INV TMP HIGH Inverter 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 OVERLOAD
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.
INV BLCK
Inverter operation is automatically
stopped due to a fault.
Consult Technical Service.