stickman47

Masterdrive Blow-Ups

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I have 7 AC Masterdrive CUVC drives, in 3 machines. Last week one on the machines started blowing the pre-charge board, for no apparent reason. This machine has an isolation transformer on the line. The transformer was checked out and found to be good. Drive 'A' blew out first. After replacing the charging board, firing card and line fuses, we started up o.k. After about an hour the charging board on drive 'B' blew out the same way. We replaced the damaged boards and started up again, without incident. After a week of running, the charging board on drive 'B' blew again. Again we replaced the damaged boards, but this time we also had to replace the Inverter card as we were getting "F011" Overcurrent fault on start-up. Since then we have been running, without incident. We have a recorder on the line phases and see no ripple or spikes. We had a Siemens technician in to help us explain this problem but he was at a loss to tell us why the pre-charge boards are exploding. We have inserted a piece of teflon, between the pre-charge board and the firing card to prevent losing the firing card again, if the charging board should decide to explode. Has ANYONE experienced this, seemingly random, loss of precharge boards? Drive info is: 6ES7033-7EG60-1AA1-K80 w/ CUVC and CBP2.

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