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Compressor motor

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Dale in Ar.

12-05-2004 20:07:00

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We have a six wire compressor motor that we want to wire up.There is no diagram as to how it is to be wired.It has two small wires that have no numbers on them but one wire goes to a capacitor and the other small wire comes out of the motor.The rest of the wires are numbered 1,2,3,4, and are larger in size.Now my question,how do we wire the motor??We want to wire the motor for high voltage(240 vac)I believe that for low voltage the wires 4,2, and one small wire(don't know which small wire,although it probably doesn't matter being dual phase)are tied together.Then wires 1,3,and the other small wires are tied together.We need to know how to tie together for high voltage.

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Dale in Ar.

12-06-2004 21:01:00

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Re: Compressor motor in reply to Dale in Ar., 12-05-2004 20:07:00

Thanks guys,I'll try this diagram just as soon as I can get back to the shop.I figured that somebody knew what I had or could inform me on how to wire it up.I'm no electrician,nor do I deal enough with motors to figure out how they work.Again thanks.

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Farmall_Ryan

12-06-2004 12:04:50

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Re: Compressor motor in reply to Dale in Ar., 12-05-2004 20:07:00

I included a pic to describe what I was talking about and with the numbers Steve mentioned.

With an ohmmeter you can check to verify the winding numbers. Testing resistance across 1-2 and across 3-4 ought to yield the same number (say something like 4 ohms). Testing across the small wires should yield a higher resistance (maybe something like 9 ohms).

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Kevin Bismark

12-06-2004 17:36:48

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Re: Compressor motor/nice job in reply to Farmall_Ryan, 12-06-2004 12:04:50

Nice job with the diagram, there used to be a question exactly like that on the Minnesota electricians exam

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Steve25

12-06-2004 08:26:11

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Re: Compressor motor in reply to Dale in Ar., 12-05-2004 20:07:00

Lead #1 goes with line 1; #2 and #3 and one of the small wires get connected together and taped; #4 and the other small wire go together and connected to line 2. This is the 240 volt connection. If the motor runs the wrong direction, change places with the two small wires. This is the industry standard for dual voltage connections but there is still a chance that the manufacturer may have there own way of doing the connections. If this does not work send me an email. Steve

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Farmall_Ryan

12-05-2004 21:05:20

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Re: Compressor motor in reply to Dale in Ar., 12-05-2004 20:07:00

The two smaller wires are the leads to the start winding while the larger 4 wires are the leads for 2 run windings.

With a meter and some basic knowledge of motors you could figure out how to correctly wire the motor, but I suggest you check the manufacturer's website.

When wired for low voltage (115V) the two run windings and the start winding will all be in parallel.

For high voltage (230V) one of the run windings will be wired in parallel with the start winding. The other run winding will be in series before the 2 parallel windings.

Note that often there are thermal protection breakers and centrifugal switches or relays in the motor wiring as well.

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Rod in Smiths Falls, ON,

12-05-2004 20:35:50

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Re: Compressor motor in reply to Dale in Ar., 12-05-2004 20:07:00

Chances are there is a wiring diagram on the company website. Figure out the make and model of the motor and start surfing.

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Dusty

12-06-2004 06:07:38

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Re: Compressor motor in reply to Rod in Smiths Falls, ON, , 12-05-2004 20:35:50

Look on the inside of the cover that covers the electical termminals, for the wiring diagram.

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