If the drive system is cat micro command there should be a self diagonstics swithh inside the control card.You have to remove the main fuses to run the diagonstics.Throw the switch in the control card and start the test cycle.each test that passes will advance the display to a higher number and the last test will cycle the contactors.It has been a long time for me to test the micro command but try the self test with the main fuses in first.You cant hurt the card.you probably have a loose or dirty connection
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