Posted 15 May 2006 - 06:07 AM
Two caps blew off on our dc bus and all the semiconductor fuses on the input supply burnt. The vsd is a 900 k W one.There is no fuse on the dc bus. I am afraid all the caps had been stressed and are not recoverable.
Any clue ?
Posted 15 May 2006 - 06:17 AM
to add some useful comments it is necessary to know more details, like ambient temperature or humidity problems, capacitors age, service time (i.e.: too long period of inactivity), type of application, overvoltage/braking unit protection, type and manufacturer, and all info useful to state the true reason of this failure.
Posted 15 May 2006 - 06:33 AM
Thanks for your help. The two caps blew off just after all the caps in the drive were replaced by new ones. It happened that two capacitors were wrongly installed with the polarities reversed. When the vsd was switched on, the semiconductor fuses blew almost at once.
Posted 15 May 2006 - 09:03 PM
I would have a spare pair of underwear on hand for the recomisioning just in case
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