ABB PQFS Installation, Operation And Maintenance Instructions page 194

Fault message
DC overvoltage (HW)
DC undervoltage (SW)
IGBT check cooling
194 Troubleshooting guide  Manual Power Quality Filter PQFS
Cause
The DC hardware
overvoltage protection
has been triggered.
The DC software
undervoltage protection
has been triggered.
The software IGBT
temperature protection
has been triggered.
What to do
−
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.
−
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.
−
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