Wiring Up an AC Motor

I've recently acquired an 1/8 hp AC Motor which I'm trying to hook up to see if it is any good.

The motor is a Dayton Model 3M292 Permanent Split Capacitor (PSC) motor. I know it works off of 110 VAC single phase and will pull 1.8 Amps (according to the specs). Unfortunately, I can't find any hookup schematics (it came with no manual of course).

The motor has a large capacitor (I presume) which has two wires running into the case of the motor. From the case of the motor there are four wires to be connected to whatever is driving the motor. They are Black, Brown, Blue, and White.

Two makes sense to me (hook it across a main and see it spin), but I don't know why there would be four wires.

Can anyone with more knowledge of A/C motors give me a hand.



Reply to
Kevin C.
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Dayton is Grainger's house brand. For information:

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Reply to

Like Jeff mentioned Dayton is a brand of Grainger, and a Google search for Dayton 3M292 would have turned up this motor in the first few hits.

So now that you know about the power of Google , here's the relevent page:

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I was going to suggest the two sets of wires were for different speeds, but the specs show just one speed. It does say the motor is CW/CCW rotation. The location of the motor on the Grainger site suggest the motor is for central heating and air applications, and indeed, you'd want a reversible motor for this, to control the direction of the fan blade.

Grainger might be able to provide a PDF of the connection diagram. You might ask.

-- Gordon Author: Constructing Robot Bases, Robot Builder's Sourcebook, Robot Builder's Bonanza

Reply to
Gordon McComb

The four wires allow the motor's rotation to be reversed: the main winding is connected to 120V with the same colors as the incoming line: white-to-white, black-to-black. The capacitor winding is connected across the line, too, but can be hooked up either way to reverse the spin.

Look for a wiring diagram stamped into the stator-housing or on the underside of the little plate that covers the (laughably small) wiring compartment

Check with an ohmmeter for two wires that read continuity: those are the main winding (the capacitor winding will real very high resistance.)

Better yet: Talk to Grainger and get the real scoop on this motor. They're Ok about this, being a big distributor that wants customers to be happy and alive. Wade

Reply to
Wade Hassler

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