196 Troubleshooting guide
Manual Power Quality Filter PQFS
Fault message
Cause
What to do
IGBT
permanent
The IGBT module reports an
error that cannot be cleared
by the system. This error can
be due to peak overcurrent,
too low control voltage for the
IGBT drivers or IGBT module
failure.
−
Identify unit for which the
red LED (3) is on.
−
Inspect the corresponding
IGBT module (bridge and DC
capacitors) for visual traces
of damage. If they are
present, exchange the IGBT
module.
−
Verify flat cable connection
between the Control board
and the IGBTs.
−
Ensure that the Control
board power supply is
around 24 V. If significantly
lower, check the 24 V power
supply and the wiring
between this supply and the
control board.
IGBT
temporary
The IGBT modules report a
transient error that could be
automatically cleared by the
system. This error can be due
to peak overcurrent or a too
low control voltage for the
IGBT drivers.
If the errors occur sporadically and the
system rides through, nothing has to be
done. If the system does not ride through
(too many transient errors in a short
time):
−
Verify that the filter CTs are
properly installed and are
not shorted.
−
Verify that the unit current
ratings and order
programmed at the
commissioning stage
corresponds to the rating
and order physically present.
−
Verify the filter cooling
system and check the IGBT-
temperature using the PQF-
Manager.
−
Deactivate harmonic and
reactive power requirements
and see if the problem
persists.
−
Inspect the items discussed
for the ‘IGBT permanent’
message.
Loss of phase
The system has detected a
loss of supply on at least one
phase.
−
Measure the three line
voltages and check if they
are within limits.
−
Measure the line voltages
(e.g. voltmeter) and compare
them with the line voltages
