ABB PQFS Installation, Operation And Maintenance Instructions page 200

Fault message
Overcurrent
RMS
Overcurrent
peak (SW)
Overvoltage
RMS
Preload
problem
200 Troubleshooting guide  Manual Power Quality Filter PQFS
Cause
The system has detected RMS
overcurrent in the filter.
The software peak current
protection has been triggered.
The RMS value of the supply
voltage measured with the AC
voltage measurement board is
higher than the acceptable
maximum value.
The DC capacitors could not
be preloaded at startup. The
voltage increase on the DC
capacitors during the preload
phase is not high enough.
What to do
−
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.
−
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.
−
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 PQ-Link).
−
Ensure that the AC voltage is
properly measured.
−
Measure the three line
voltages and check if they
are within limits.
−
Verify the fuses (PF1 and
PF2) and the resistors (R1