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Need Help Wiring a 120/240 single phase motor

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Forum topic by TheWoodenOyster posted 59 days ago 334 views 0 times favorited 7 replies Add to Favorites Watch
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TheWoodenOyster

646 posts in 541 days


59 days ago

Topic tags/keywords: bandsaw

Hey Everyone,

I picked up a 1960’s powermatic 81 bandsaw a few days ago. We took the motor out to load it into the truck. The guy I bought it from swore that all I needed to do was look at the wiring diagram and I would know exactly how to rewire it when I got home. Well, I have never wired a motor before, and I know it is relatively simple, but I can’t figure out how to rewire this thing. I have attached photos of the the motor wiring diagram and the 3 wires that are hanging out of the saw.

He had the following wires coming out of the motor twisted together:

1 and 8 together

7 and 6 together

2,3, and 5 together

So, coming out of the saw I have a black, white, and green wire. I know I am supposed to wirenut each of these three colors to a corresponding group of wires coming out of the motor.

So, which bunch of motor wires goes with which wire coming out of the saw?
And what do “tape” and “line” mean on the diagram?
Last, did this guy even have it wired correctly?

Thanks so much for the help guys. I tried to find a good answer online, but it was a waste of time. I am sure one of you will be much more informative. Hopefully this will be the first and last time I will have to learn how to wire these simple motors.

-- The Wood Is Your Oyster


7 replies so far

View Loren's profile

Loren

7284 posts in 2254 days


#1 posted 59 days ago

“Tape” means twist the wires together and put a wire nut
over the wire ends, then put electrical tape over it.

Green is always ground.

The motor is wired for counterclockwise rotation at 220v,
see the statement under the diagram?

He’s got 6 and 7 wired together wrong. It may be
harmless, but I would tape off 7.

-- http://lawoodworking.com

View TheWoodenOyster's profile

TheWoodenOyster

646 posts in 541 days


#2 posted 59 days ago

Thanks,

So 6 should be attached to black (or white)

1 and 8 should be attached to white (or black)

2,3, and 5 should be attached to green

and 7 should be capped

Correct? I am assuming that you can attach the “line” bunches to either black or white

-- The Wood Is Your Oyster

View Loren's profile

Loren

7284 posts in 2254 days


#3 posted 59 days ago

Yes, “line” is black or white. At 110v line is black and white
is neutral but they are reversible as neutral functions as a ground
wire and only one “hot” wire is used at 110v.

Green should not be attached to any of the other wires. It
should be attached to a ground nut behind the panel
which is usually green colored but can be any nut attached
to the body of the motor. If there is a junction box
on the motor, the ground nut can be one of the screws
attaching the box to the motor.

-- http://lawoodworking.com

View TheWoodenOyster's profile

TheWoodenOyster

646 posts in 541 days


#4 posted 59 days ago

Cool. I think I got it. Thank you

-- The Wood Is Your Oyster

View jonah's profile

jonah

442 posts in 1904 days


#5 posted 58 days ago

Unless my eyes deceive me, it should be this for 240V:

1+5 wire nutted together with one of the hot wires
6 wire nutted together with the other hot wire
2+3+8 wire nutted together attached to nothing
7 wire nutted by itself

For some reason there is no wire #4. As Loren notes, the ground should be attached to a ground terminal screw somewhere inside the wiring box. If you can’t find one, attach it to any metal screw inside the metal box.

You said 1+8, but the picture says 1+5 for 240V.

View jonah's profile

jonah

442 posts in 1904 days


#6 posted 58 days ago

Is there some reason the previous owner had it set up to run counter-clockwise? That’s what you get when you exchange wires 5 and 8.

View TheWoodenOyster's profile

TheWoodenOyster

646 posts in 541 days


#7 posted 58 days ago

Yes, the saw is set up for a counter clockwise motor.

-- The Wood Is Your Oyster

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