ABB PQFS Installation, Operation And Maintenance Instructions page 205

Fault message
Com. Problem (CAN
Bus)
−
Real time
clock
problem
−
Watchdog
fault
−
Internal
µC fault
−
Corrupted
DSP code
−
Corrupted
µC code
Different firmwares
Remark:
If the problem persists, contact your ABB service provider. Provide him with all the
relevant information, i.e. Filter serial number and type, status of the control LEDs, Error
messages displayed and filter behavior.
Cause
The communication
through the CAN bus
between units is not
working properly.
Internal system error
Different units in a filter
system have different
firmware version (DSP or
microcontroller)
Manual Power Quality Filter PQFS  Troubleshooting guide 205
What to do
−
Check the RJ-45 cables
between modules.
−
Check the termination for
the CAN bus: both (and
only) the ends of the bus
must have the DIP switch
S5-4 in the "set" status.
−
Reset the filter by
switching off and on the
power. If the problem
persists, contact your
ABB representative. The
controller card must
probably be replaced.
Reset the filter by switching off
and on the power. If the problem
persists, contact your ABB
representative. The controller card
must probably be replaced.
Upgrade all the units with the
same (most recent) firmware.