| Gallery, Projects and General > How do I?? |
| how to check a motor |
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| DavidA:
Getting back to the original question. I used to have to do a lot of three phase motor winding checking when I worked in factory maintenance. We used to make sure there were no links on the terminal block, then use a Megger to check the earth/winding and the interwinding resistance. Generally this gave us a go-no go decision for the motor. Dave. |
| NormanV:
The last few posts have totally confused me. I know nothing! I did the smell test suggested by Bill in post no. 2, it smelt fine. But what do I do now? DavidA, hi, I don't understand what you are suggesting. Could you explain it for an idiot please? Norman |
| JohnHaine:
Well you learn something every day... |
| JohnHaine:
Well that was interesting, reading up a bit on fluorescent lights. They don't all have PF correction caps, certainly not the cheapskate ones I bought from the local DIY shed, but obviously a good idea if you have quite a few lights. Seems that commercial luminaires have them cos premises tend to have lots of lights and the PF loss can be significant. |
| DavidA:
Norman, All it means is that you have to make sure that non of your motor windings are connected together (by brass links on the connecting block) as you need to check each winding seperately. A Megger is just a high voltage/low current insulation tester. So you are checking for insulation breakdown between the seperate windings and also for breakdown between one or more windings and the frame. Normaly there are three windings. So check each one against the other two, then each one between the winding and the frame. Hope this helps. It's easy to me as I started out as an industrial eletricians's apprentice. I do understand that not everyone knows this kind of thing. Dave. |
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