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Dinge
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Joined: 22-October 09
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Last Seen: 13th November 2009 - 05:08 AM
Local Time: Mar 17 2010, 01:21 AM
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6 Nov 2009
It's common knowledge nowadays that the Electrolytic Capacitors in the DC Bus or Link of VSDs can undergo chemical changes to the dielectric if left in storage for too long. Unfortunately we find this out the hard way as the drive goes bang when we turn it on.
The recommended procedure for dealing with a drive that's been out of service for a long time (2 years or more) is to soft power the drive with a Variac to "reform" the capacitor chemistry. Sometimes this is done by running the Variac through a 3 phase rectifier directly into the DC Bus to get around drive's SCR front end. My question is: How effective is this procedure and does it totally "repair" the capacitors chemistry ?
22 Oct 2009
Hi all, first post so please forgive any muckups.
Any one have experience with SKF's TKED1 EDM bearing spark discharge detector. I've tried one on a 400KW Pope motor with known EDM issues and found the detector was indicating a lot of activity (hits) at the DE and NDE ends. Was also picking up and registering hits from the motor cable and surrounding metalwork - so a bit confuesed as to how useful it will be. |
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Lo-Fi Version | Time is now: 16th March 2010 - 02:21 PM |
