Hello all, hoping there is a quick fix for this....
I have a production machine down right now. 400VAC input... DC Bus flucuates. Symptoms are when all enables are finally engaged, the I/R module 6SN1145-1BA00-0CA0 has 600VDC and shows a luminating active #4 yellow LED for a short period of time (2-3 seconds), at which point all LED's are off for approx 20-30 seconds while DV voltage drops imediately to ~200V (I only watched it twice) and slowly climbs up to ~500V, then yellow LED again for 2-3 seconds and cycle repeats.
The rectifying diodes appear to bias properly.... so must be capacitors???
Any further testing or conclusions I can make?
Thanks in advance.