Harry007 Posted January 19, 2009 Report Share Posted January 19, 2009 I have a 5.5kW motor, supplied via a 5.5 kW VSD. In the last three months the VSD output blows up three times. I checked motor - all appears fine, running normal at 6 amps. This happens only at Monday morning start-up and I have changed drive type, but no luck. Do anyone have an idea what might cause this and/or have an idea how to protect the VSD from blowing up? Link to comment Share on other sites More sharing options...
marke Posted January 20, 2009 Report Share Posted January 20, 2009 Hello Harry007 Welcome to the forum. I would suggest that you megger test the motor first thing on Monday morning before any voltage is applied. You should first remove the output cables from the VFD and then megger at the VFD end of the cables so that the cables and the motor are tested. You may find that you have a condensation problem or similar. Best regards, Mark. Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
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