Hi, i have a cnc with ac tech spindel drive, the drive is a q14015-566 15hp on 380v. somne time drive stop at give fault error, i reset it and drive come up to lift some time. now the drive stop to run, fault 1 and now ant to restart. i tried with a second motor same result. i tesed the igbt, i get 580v cd on p-n input. the igbt like to be good. i tesed the igbt (PM50RHA120) with a 50v power supply and the 3 low side transistor and the 3 high side like good. the pin 16 not source current ( i think no fault). the pin 16 is on a photcoupler pin 2 and pin 1 is on 15v. i get 0.6v on photocouple them i think no fault.
if i remove control circuit flat wire i get same error when i source power to control circuit without power circuit.
anybody have service manuel for this drive or have an idea?

Thanks
Dominic foisy

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