ABB PQFM Instruction Manual page 213

Fault message
DC overvoltage (HW)
DC undervoltage (SW)
Ground fault
IGBT check cooling
Cause
The DC hardware
overvoltage protection
has been triggered.
The DC software
undervoltage protection
has been triggered.
A ground fault has been
detected.
The software IGBT
temperature protection
has been triggered.
Manual Power Quality Filter PQFM ç Troubleshooting guide 213
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 equipment for possible
connections to earth.
- 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 noting the ambient
temperature and altitude.