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Tool Talk Discussion Forum

Bench Grinder Wiring

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Slowpoke

11-12-2003 01:11:03




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I have a large green industrial bench grinder, probably '40s or '50s. The tag, switch, and plug are gone and the wiring has deteriorated. It's a 4 wire cord with black, white, red and green. The green wire has a non factory ring terminal; does it go to the frame?
Underneath the base several of the motor leads are hanging loose and old electrical tape has come off something. The motor leads 1&7 are connected to the white power wire with tape.
The motor leads 2&8 are connected to the black power wire with tape.
The motor leads 4,5&6 are soldered together, bare.
The motor leads 3&9 are soldered together, bare.
Assuming no switch is used, are the black and white wires connected right? Where does the red power cord wire go?
If the motor is 240v which wire(s) is switched?
Are leads 3&9 used or capped?
Are leads 4,5&6 used or capped? I can't find my industrial electric book, so any help appreciated.

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KeithF

11-12-2003 14:04:31




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 Re: Bench Grinder Wiring in reply to Slowpoke, 11-12-2003 01:11:03  
You have a multiple voltage 3 phase motor. For instance, they usually are 208-230/460. Or some may be 120/208-240. It just depends on the windings. Anyway, the wiring for low voltage is with 4-5-6 tied together by themselves; 9-3 and one leg of the three phase; 8-2 and one leg of the three phase; 7-1 and one leg of the three phase. For high voltage 6-9 tied together, 5-8 tied together, 4-7 tied together. The three legs of the line voltage goes to the remaining wires 3 and 2 and 1.

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Jet9N

11-12-2003 08:25:01




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 Re: Bench Grinder Wiring in reply to Slowpoke, 11-12-2003 01:11:03  
As Mac thought, it is wired for 220/240 3phase.
It should be wired through a 3 pole motor starter.

HTH

Jet



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Mac

11-12-2003 07:17:46




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 Re: Bench Grinder Wiring in reply to Slowpoke, 11-12-2003 01:11:03  
Slowpoke: Its been about 50 years since I messed with that stuff, but seems to me, being 9 wires, thats a 220V 3 Ph. motor setup. Lot of old industries used that. I am at a loss with the wiring config. on this.



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Slowpoke

11-13-2003 01:13:01




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 Re: Re: Bench Grinder Wiring in reply to Mac, 11-12-2003 07:17:46  
The fellow I got the grinder from thought it was wired for 460v, but it appears to have been wired for low voltage. So the loose red wire went to #3 & #9. Thanks to all for help with the answer. The amount of knowledge on this board is amazing. I really appreciate the help I get here.
Slowpoke



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