ABB PQFS - Page 194

194 Troubleshooting guide  Manual Power Quality Filter PQFS
Fault message Cause What to do
DC overvoltage (HW)
The DC hardware
overvoltage protection
has been triggered.
− Check the connection
between the DC voltage
measurement connectors
(P6-5 and P6-7) and the DC
capacitors.
− Check flat cable
connections between the
Control Board and the
IGBT module.
− Analyze network voltage
stability (amplitude and
phase).
− Disable reactive power
compensation and
balancing options to see if
the problem persists.
− Deselect the high
frequency components to
free DC bus resources and
to see if the problem
persists.
DC undervoltage (SW)
The DC software
undervoltage protection
has been triggered.
− Check the connection
between the DC voltage
measurement connectors
(P6-5 and P6-7) and the DC
capacitors.
− Check flat cable
connections between the
Control Board and the
IGBT module.
− Analyze network voltage
stability (amplitude and
phase).
− Disable reactive power
compensation and
balancing options to see if
the problem persists.
− Check the main contactor
and its control signal.
IGBT check cooling
The software IGBT
temperature protection
has been triggered.
− Check the cooling of the
filter system (fans and air
flow, heatsink).
− Check the cooling of the
location where the filter is
installed (air conditioning
system etc.)
− Ensure that the correct
derating factor is applied