Do one thing remove all CT connector from power card and check any fault comes ?
If fault not coming then CT faulty if fault comes then control card fault.
I have same problem in ABB ACH550, can you please share photo for CT location into the power board?
- @click2electro I have replaced the CTs and CT IC mentioned in your reply and the fault gone. Thank you
- Kindly assist me in new case that is appeared after replacing the power module, where the output voltage is not same between phases as follow:
- U-V= 380v
- U-W= 260v
- V-W= 265v
@motaz4a check attachment, may be IGBT driver section faulty.
IGBT driver section mark on attachment image.
@click2electro I didn't find the attachment, could you please resend it?
meanwhile, the IGBT driver has been replaced (2 ICs), While replacing the power module I found some of the tracks were cut and I have tried to repair them.
I will check them again
@click2electro Thank you
one question please, I have ordered CT (HX 10-NP) from Farnell site but the received CT although has same P.N but different connection between primary and secondary as follow photos, therefore I have opened the new CT and reconnect the primary and secondary as the original. Does that affect the current measurements or that's fine?
@motaz4a use only original CT if use another CT may be some current sensing issue occurs
@click2electro I have compared the current measurements circuit in both CTs they are identical but only the difference in primary/secondary connection in series or in parallel.
I have adjust the connection as per the original CT.
I will run the VFD to check the current readings
