Need help figuring a circuit out

[Sarge-Pepper]

Hey everyone!

So I got a problem. I am restoring an industrial dough sheeter (it presses dough into a pancake), and it seems the person before me did some DIY fixin’ to it, because it doesn’t match the wiring diagram I got.

It’s pretty straightforward, as far as the elements of the circuit. There’s the motor, a relay, a toggle power switch, a lever action safety switch, and the power plug. I need to figure out how to wire them together. It worked when I got it, so I know it’s at least functional, but I’m def not an electrical dude, so I figured I’d reach out.

The motor has three wires (red, white, green) so I am assuming it’s a single phase. The relay (I THINK) is four pole, but there’s no labeling on it identifying the poles. The power switch seems to be straight forward, the safety switch is a depressable lever that clicks when pressed closed (it’s has two wires) and the plug is a 120v, three prong house plug.

The help I need is basically, how does this all go together? I lost all my pictures I had from the teardown, because I procrastinated backing them up off my phone… And then the phone died, taking the memory with it. So I have to start from square one for reassembly.

Pictures of everything are attached. I tried to include serial numbers where they are present.

The relay (no. 9575H2441A, four poles visible, two coil, and two NO, neither set are labeled positive or negative)

Thanks in advance! Feel free to reach out to me via email with more questions: zypher2788@gmail.com

[Sarge-Pepper]

Whelp, apparently I can only embed 1 photo since I’m new. So here’s the motor

[Sarge-Pepper]

The Power Switch: (9001 BG201 made by D Square, 8 ports on the back, but only 4 of them have brass connections slotted in)

[Sarge-Pepper]

And here’s the safety switch. It’s a unimax, but I couldn’t get a serial number or anything off of it

[RealCarlRaymond]

I love a good motor puzzle. I’ve been sketching things out for a few minutes, and I think I’ve got it figured out.

Obviously proceed at your own risk. This is an Internet diagnosis, which is only slightly better than a psychic reading.

Verify everything with a meter in “continuity” mode, where it beeps when you touch the probes together. We have a couple of meters in the electronics area that will work for this.

You’ve got a single phase motor that can run on 120V or 240V. I assume it’s wired up for 120V. Verify the wires match the diagram on the motor.

I found the relay here: Amazon.com: Cutler Hammer 9575H2441A Type AA Relay 9575H2441-66 : Industrial & Scientific and the start/stop switch here: SQUARE D 9001BG201 SER. A PUSH BUTTON STATION (AS PICTURED)USED: Amazon.com: Industrial & Scientific. The extra pictures help a lot.

The safety switch looks like it should be normally open, and is closed (passing current) when a guard is in place, or a when door is closed, and pressing the lever, and it opens (stops current) when it’s not. So electrically it’s N.O., but it in use it’s N.C. (closed when the guard is present or the door is closed and it’s safe for the motor to run).

The START button should be N.O., and the STOP button should be N.C., both momentary pushbuttons.

Verify all this. With the meter on the START button, it beeps when pressed. On the STOP button, it beeps unless pressed. On the safety switch. it beeps when the lever is depressed.

The purpose of the relay is to latch it on when you press START.

Everything that can make the motor start or keep running should be N.O., and everything that can make the motor stop should be N.C. All the N.O. devices go in parallel, and all the N.C. devices go in series.

Try this first, for a quick check that the motor spins the right way. It will only run while you press the button, so give it a quick press and release and make sure everything is OK.

Then wire it up like this.

Depending on where that safety switch goes, it may be easier to wire it on the “back side” of the motor. But it’s very important that it both turns off the motor, AND releases the relay. Otherwise the motor would restart as soon as the safety is pressed again.

Good luck!