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24th Jul 2019, 07:41 PM #16Golden Member
- Join Date
- Apr 2018
- Location
- Drouin Vic
- Posts
- 633
I can bring this thread to a happy, if slightly embarrassing, conclusion. Rather than shorting the windings when I replaced the internal connection wires, I had simply mixed them up. I went inside the motor again looking at the windings in preparation for stripping the thing out, and it occurred to me that I may not have correctly identified what went where. The little identifying tags on the old wires were completely illegible- I could just make out 'A2' on one of them but nothing at all on the others- and in my ignorance I had not labelled them when dismantling the motor. I had replaced the wiring with cores from some 3-phase flex, same colour wire across each phase with red heat shrink one end and white the other, to identify pairs and groups. Turns out I had one phase reversed, which became apparent when I looked more carefully at the furrows in the lacquer where I had dug the old wires out. I partially reassembled it and did a test run, it ran quietly with no smoke so I re-labelled the connectors and reassembled. Runs like a charm. I couldn't believe it wasn't cooked after the amount of smoke that came out of it with one phase reversed, but all the pairs had the same ohm reading and no shorts to ground so i seem to have dodged a bullet. So I'm as happy as a pig in mud, after quotes of '$450 minimum' and $600 from rewinders and several hours of daunting research on a DIY job. Thanks to those who have replied with helpful advice. If nothing else, I have learned a lesson about dismantling motors without making sure the wires are labelled.
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24th Jul 2019, 08:15 PM #17Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,183
Good to hear its working but if you've already let some smoke out I would at consider having a Megger (insulation) test done on it otherwise it could go anytime.
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24th Jul 2019, 10:19 PM #18Diamond Member
- Join Date
- Oct 2008
- Location
- N.W.Tasmania
- Posts
- 1,407
I think that BobL has a point here, but if you speak with a motor rewinder, they may be able to just clean and revarnish the windings to basically make it like new again, worth asking about it anyway IMO. In any case I wish you good fortune with it whatever you decide.
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24th Jul 2019, 11:11 PM #19Golden Member
- Join Date
- Dec 2007
- Location
- Adelaide
- Posts
- 574
That's excellent news, good to hear you have dodged a bullet, while a diy rewind might have turned out a bit of an adventure - it's an adventure that is best avoided.
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