ABB PQFS Installation, Operation And Maintenance Instructions page 158

Fault message
IGBT temporary
Loss of phase
Mismatch between units
158 Troubleshooting guide ç Manual Power Quality Filter PQFS
Cause
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.
The system has detected a
loss of supply on at least
one phase.
Different units in a filter system
have different ratings or
different connections (e.g. 3-
wire and 4-wire).
What to do
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.
– Desactivate harmonic and reactive
power requirements and see if the
problem persists.
– Inspect the items discussed for the
'IGBT permanent' message.
– 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 given by the filter
(PQF-Manager or PQF-Link).
– Check the AC voltage
measurement connectors (P6-1 to
and P6-4) for loose connections
and component damage.
– Check the connections between
the auxiliary fuses and the AC
voltage measurement connectors
(P6-1 to and P6-4).
– Check the filter parameters
(Cf.Chapter 8).
Recommission the filters
If recommissioning does not solve
the problem, contact your ABB
service provider.