Electric motor wiring

[Hughman]

OK, there is another thread just below, but this wants a different answer....

110/220 v 2hp 3450rpm. motor turns anti-clockwise. saw blades don't like this.....:(

If the connections are: L1 (white), 2, 3, L4 (Black), and "9" is connected to 3 and "S" (or "2") is commected to L4 (for 110V operation), what combination will reverse it?

I don't want to let the smoke out....:rolleyes:

Note: panel has "9" on 2, and "S" on 3 for 220v operation.

[TMny]

Hugh--
If no one more knowledgeable responds, try an electrician, or website of motor mfgr....

Virtually all 3-phase (induction) motors can be reversed by interchanging any two of the three phase leads.

Virtually any single phase (induction) motor can be reversed by reversing the polarity of the connections to the 'start' accessory windings. For a discussion of single phase induction motor ops see Cyril Veinott, Fractional Horsepower Induction Motors C(1948) or related, possibly: http://www.amazon.com/gp/product/0070673934/ref=sid_dp_dp/002-1087350-5947233?ie=UTF8 .

I don't think most motors are designed for conveniently changing/reversing rotation; they may be optimised for one way (or maybe not!) Most of the wire/pigtail/winding connections are to just swap from series to parallel stator windings for 120/240 operation ; the info required may be model-specific.

Single phase induction motors use a centrifugal switch to include a special startup winding which is used in combination with the main run winding [and usually a capacitor, as well] to cause torque adequate to spin the motor at startup. This auxilliary winding makes the single phase motors more expensive than 3-phase at same power level. I once wired a washing-machine motor (1/2 HP) for reversing duty on a lathe... not pretty , but functional. This info may be obsolete relative to your motor....

Sometimes people run the vee-belt in a figure-eight rather than oval to effect reverse rotation of driven device {more risk at higher power/RPMs}. Some motors have shaft extension from both ends ; or motor may be mounted other side for opposite drive rotation. t m

[pipefitter]

I have seen quite a few reversible motors but were usually on large belt driven fans and it was switchable via toggle. You need to look under the plate in the end bell that exposes the connections for a diagram or find the diagram per specific motor. Some diagrams are on the name plate on older cast iron housed motors.

[Tom Lathrop]

There is bound to be an outfit near you that does work on AC motors. I'd take the motor to them for their advice. Don't mess up a motor based on what you might interpret from what you hear here even though some know about this stuff. Some motors are reversable but most are not.

[Tom Robb]

Yellow Pages - Electric Motor Repair.

[htom]

Third Tom to say "ask the real experts".

[ddeaton]

Hughman,
Kinda confusing reading the post. But it doesnt take much to confuse me. Exactly how many wires are coming from the motor and what are they labled. Dont count the 2 incoming power wires. I am assuming this is single phase, only from the 110v portion of your post.
Like TMny said. To reverse a 3 phase motor, just swap any 2 of the incoming power feed wires. Single phase, dual voltage motors are a little different. It should say on the namplate or inside the junction box cover what the connections are and how to reverse.
I also agree with the other posts, find someone local if you can to look at it. I am a control electrician with 30 yrs experience, but without more info or actually looking at it, I dont want to steer you the wrong way.
Danny