Wiring Square D Control Station

[DHomb]

After about 8 years of sitting, I am trying to finish up the restoration of an old Craftsman belt sander. Trouble is I don't recall how the switch was wired and I am not the best with wiring. Any help of where the wires coming from the motor to the switch and back out to to 110 outlet go would be appreciated. I have attached some photos of the switch.

 

[LXCam]

Is there also a relay and or starter in the enclosure or mounted somewhere else

 

[micromind]

If it's 120 volts, a basic handy box and a light switch would be easier.

If you're worried about dust getting in the box, then get a Bell box and a weatherproof switch cover.

 

[DHomb]

Is there also a relay and or starter in the enclosure or mounted somewhere else

Photo above is in the off position with red button depressed.


Photo below shows the power button engaged (the silver disc raises up and engages with the contacts of the brown box. When the red button is depressed the silver disc drops back from the contacts

 

[DHomb]

If it's 120 volts, a basic handy box and a light switch would be easier.

If you're worried about dust getting in the box, then get a Bell box and a weatherproof switch cover.

yep, 120volts so definitely an option. I have a simple toggle switch to control the power on an old Walker Turner Drill press I rewired which is simple enough. When I bought the sander it had this box and controls and I had pictures of how it was wired but as said that was many years ago and I can't find them. It's not original by any means but I thought it was kinda neat.

 

[DHomb]

Is there also a relay and or starter in the enclosure or mounted somewhere else

Not that I am aware of, not sure why they went with this set up (obviously not original)

 

[Norcal]

A magnetic starter or contactor is required to use the control station, a SQ D type S starter to use the control station or a simple motor rated switch will work.

My Rockwell 6X48 sander uses a NEMA 4X stainless enclosure for the starter.

 

[dave*99]

Was the control station working with your motor when you got it? Usually a control station controls a contactor and has a normally open and a normally closed set of push buttons.

Edited....

Do you know how to do a continuity test with an ohmmeter? Testing continuity with an ohmmeter is an easy way to tell.




Some of these contacts had a normally open pair and a normally closed pair - so you would only use the pair that is closed when the on position is used. Switch only the black wire to the motor.



Do the push buttons latch mechanically (toggle the internal mechanism to hold the contacts closed then you press on and release them when you press off)?

 

[Max]

Do you know the Craftsman model number? It’s quite likely the manual had a wiring diagram or schematic, and most manuals are online.

 

[LXCam]

Is that a mechanically held switch?

Do you have an ohm meter. Push the start switch and check for maintained continuity across the terminations then push the e stop and see if it breaks contact.

I just confirmed it is a maintained contact switch. when you push the start button, the stop button has a mechanical interlock that holds the start button in the run position. When you hit the stop button, it releases it.

All you need to do is ground the encloser green, tie the whites together (neutral) and line to one side of the switch and load to the motor (blacks) (normally open contacts - marked NO)

 

[dave*99]

I suspect you will be switching that black wire using the 2 screws that have tool marks on their heads. An ohmmeter will confirm.

 

[wyliesdiesels]

Do you know the Craftsman model number? It’s quite likely the manual had a wiring diagram or schematic, and most manuals are online.

this is one thing i absolutely love about craftsman. manuals and parts breakdown are available still to this day....

 

[DHomb]

Do you know the Craftsman model number? It’s quite likely the manual had a wiring diagram or schematic, and most manuals are online.

103.22540 is the number I have found a little bit of info on Vintage Machinery

 

[Max]

103.22540 is the number I have found a little bit of info on Vintage Machinery

I found the manual but it doesn’t have a wiring diagram. In case this helps in other areas:

 

[dave*99]

Follow the directions in post 10 and it should work fine.
Originally that sander probably had a motor with a plug and cord.

Make a cord and plug
Connect white to white and green to green and chassis in the control box.
Connect the 2 black wires to the screw terminals with tool marks on the heads.

The sander manual you posted shows an accessory item that is a power switch. 9-21205

Sears | Craftsman - Publication Reprints - Motor: 21205 Power Pak Motor & Accessory Lamp Switch | VintageMachinery.org

You don't need it. It's very old and there is no ground prong.

 

[DHomb]

Follow the directions in post 10 and it should work fine.
Originally that sander probably had a motor with a plug and cord.

Make a cord and plug
Connect white to white and green to green and chassis in the control box.
Connect the 2 black wires to the screw terminals with tool marks on the heads.

The sander manual you posted shows an accessory item that is a power switch. 9-21205

Sears | Craftsman - Publication Reprints - Motor: 21205 Power Pak Motor & Accessory Lamp Switch | VintageMachinery.org

You don't need it. It's very old and there is no ground prong.

I did confirm with a multimeter that when the power button is depressed I have an extended beep until the red button is pushed breaking contact. So I believe your assumptions are correct and that I can tie the white wires together with a wire nut connect one black wire to each side of the switch (screws with marks) and terminate both grounds to the inside of the box. Do I have that correct?

 

[LXCam]

Yup

 

[dave*99]

I did confirm with a multimeter that when the power button is depressed I have an extended beep until the red button is pushed breaking contact. So I believe your assumptions are correct and that I can tie the white wires together with a wire nut connect one black wire to each side of the switch (screws with marks) and terminate both grounds to the inside of the box. Do I have that correct?

Yes and the ground wires should also tie to the control box chassis.

 

[micromind]

I wouldn't be too surprised if the contacts of that switch burn up after a while. Usually, contact blocks like that one are not HP rated.

Could be wrong though, the blocks might be special ones that can handle the motor.