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Results 16 to 17 of 17
Thread: Electromagnetic switch
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23rd June 2015, 07:11 AM #16
New Member
- Join Date
- Oct 2012
- Location
- toronto
- Posts
- 2
Bob, I don’t think there’s any issue with the switch as you have just replaced it with a new one. If it’s still humming, there could be only two possible explanations, one is over-current and the second one is over voltage. Over-voltage is not a very common problem since there’s always over voltage protection in circuits, over-current could however be looked at. If the saw is drawing more current that what’s recommended. It could be a problem for the saw too, not just the switch.
Regards,
Ryan B.
http://blog.7pcb.com
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23rd June 2015, 11:14 AM #17
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- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 24,746
You could post a photo of the connections?
You could try the switch out on something low power like a light globe and that will tell you if the linisher load is causing the problem.
The last time I heard a loud one it had taken a bath inside a box in very fine saw dust and being a cheapie some must have got inside it and I ended up chucking it out.
Relays have similar problem and because they often use transparent casing it is possible to see the contacts fluttering inside them so they are not making proper contact due to corrosion or similar problems. These can eventually settle after a while or they can die completely.