Fault Tracing - ABB PQFM Instruction Manual

11.4.2 Fault tracing

Symptom
No display on PQF-
Manager.
All the indicator LEDs on
the electronic card (LEDs)
remain OFF.
After starting the PQF, the
fans start but they run at
low speed. The fans do not
exhibit mechanical failure
problems.
After applying the auxiliary
power to the system, the
filter fans runs properly but
the controller board LEDs
are not functioning. The
PQF-Manager cannot finish
the boot process
After applying auxiliary
power to the system, the
fan is running, the PQF-
Manager shows the
message 'Initializing
communication. Please
wait... none of the LEDs of
the main controller board is
functioning.
210 Troubleshooting guide ç Manual Power Quality Filter PQFM
Table 62: Power supply problems
Cause
The active filter
(auxiliaries) is/ (are) not
energized or no power
supplied to the filter.
- Fan voltage supply is
too low
- The tap setting on the
auxiliary voltage
transformer is set at a
too high level.
The 24 Vdc power supply
feeding the controller
board has failed.
No power supply to the
main controller board or
main controller board
faulty.
What to do
- Check if the protection (fuses,
disconnector ...) feeding the
active filter are OK.
- Check if the auxiliary fuse box is
closed and the fuses are OK.
- Check if the DC power supply
fuse is OK.
- Check the mains and auxiliary
supply voltages.
- Check the tap setting of the
auxiliary voltage transformer
(T1) and adapt if necessary.
- Check the supply voltage to see
that it is within the tolerance
range of the nominal filter
settings.
- Check the 24 V power supply
feeding the control board.
- Check the feeding cable
between the main power and
the 24 V power supply.
- Check the feeding cable from
the
24 V power supply to the control
board.
- Check the 24 V power supply
connection between the 24 V
power supply and the main
controller board.
- If 24 V power supply is OK, then
the main control board is
probably faulty. Change the
main control board.