I am repairing a Kollmorgen S700 drive. I keep getting a F12 fault, which the manual says is motor phase missing, ie cable break.
This happens wether I have a motor, open circuit, or bulb load.
Does anyone know what the drive is looking for to detect a cable break? I do not get a twitch from the motor, but I do see a spike on the output, between phases before the alarm trips the drive. The output block checks out OK.
Any help would be welcome!
Regards, Rich in the UK