ABB PQFM - Page 213

Manual Power Quality Filter PQFM  Troubleshooting guide 213
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.
Ground fault
A ground fault has been
detected.
Check the equipment for possible
connections to earth.
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 noting the ambient
temperature and altitude.