Author Topic: I need some electrical help  (Read 372 times)

Jake Parker

I need some electrical help
« on: September 09, 2019, 10:55:13 PM »
I have a Monarch lathe that requires 3 pz.
It came out of a shop that had "high leg delta".
I have the same service, I just dont know where to hook what on the start relay. Thanks in advance.


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Jake Parker

Re: I need some electrical help
« Reply #1 on: September 09, 2019, 10:58:05 PM »
Here's what I got.

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Carpenter84

Re: I need some electrical help
« Reply #2 on: September 10, 2019, 05:38:06 AM »
Looks like your line in may be up top there. You're looking for L1, L2, and L3.
T1, T2, T3 are your outputs to the motor.
Shawn

First 9x42 column mill,
Enterprise 10x28 lathe,
Ko Lee 6x12 surface grinder,
Airco dip/stick 160 welder,
Fully stocked wood shop.

Carpenter84

Re: I need some electrical help
« Reply #3 on: September 10, 2019, 05:41:44 AM »
If the motor spins in the wrong direction, switch any two of the lines.
Shawn

First 9x42 column mill,
Enterprise 10x28 lathe,
Ko Lee 6x12 surface grinder,
Airco dip/stick 160 welder,
Fully stocked wood shop.

4GSR

Re: I need some electrical help
« Reply #4 on: September 10, 2019, 07:04:36 AM »
Shawn is correct, the three terminals at the top of the relay should be you L1, L2, L3. 

Is that the side of the box next to the terminals?  If it is, that relay is too big for that box.  If this was my lathe, I would strip all that off, put a newer larger metal box on the lathe.  The relay is probably still good for now but eventually need to be replaced too.  That's a old Square D relay that was old back in 1970. First one I learned how to wire up at 14 years old.  The leads going down to the motor look toasty and very oily.  No telling what the leads look like in the pecker head.   I can't help you on a metal box, but may have a stray relay laying around here collecting dust and other stuff if you need anything else later.
Ken

Jake Parker

Re: I need some electrical help
« Reply #5 on: September 10, 2019, 07:18:12 AM »
Thank y'all for the replies. I was on the right track, it was the neutral wire that keeps throwing me off.
Im not use to 3 hots a neutral and a ground.

I have a decent sized sealed plastic box with a door. I might as well install it before wiring it.



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Carpenter84

Re: I need some electrical help
« Reply #6 on: September 10, 2019, 09:00:36 AM »
That's an Allen Bradley contactor with overload resets on each leg. There's no neutral in these photos. Only 3 lines. In fact, I don't even see a ground lug. The lathe is probably chassis ground. There's probably a 6 awg lug somewhere on an enclosure or in the castings somewhere.

Chances are the contact pads are pretty crusty. It may work fine, it may work intermittently, or not at all. No way to know. If the pads are crusty, it could create some issues. Resistance, heat, arcing, etc.
Magnetic contactors are not expensive items and are much simpler to wire now. Many have built in overload protection, short circuit protection, etc etc. They're also much smaller in physical size.

Personally, if I planned on restoring, or cleaning, or just running the machine regularly, I'd replace the major electrical components.
Shawn

First 9x42 column mill,
Enterprise 10x28 lathe,
Ko Lee 6x12 surface grinder,
Airco dip/stick 160 welder,
Fully stocked wood shop.

4GSR

Re: I need some electrical help
« Reply #7 on: September 10, 2019, 02:44:11 PM »
Shawn is right, that is a A-B contactor.  I'm wrong!  Sorry.  Them old boxes never did have a proper "grounding" lug in them.  That was something you added later.  The electrical code back then did not require a ground wire run to the machine.  The metal conduit was the "ground" for the machine.
Ken

Carpenter84

Re: I need some electrical help
« Reply #8 on: September 10, 2019, 06:11:26 PM »
Ever hear a short shoot through the old bx casing back to the panel in an old factory? It was like a loud ZOOOOOT-BANG.
Shawn

First 9x42 column mill,
Enterprise 10x28 lathe,
Ko Lee 6x12 surface grinder,
Airco dip/stick 160 welder,
Fully stocked wood shop.

Jake Parker

Re: I need some electrical help
« Reply #9 on: February 16, 2020, 11:54:45 PM »
I have the wires from the breaker box wired in finally. There's power to the relay, but the one red wire going to the start/stop switch is not hooked up, and I don't know where it goes. Please help!

Jake Parker

Re: I need some electrical help
« Reply #10 on: February 16, 2020, 11:58:15 PM »
There are 3 red wires going to the start stop switch, 2 you can see in the picture. The other is hanging loose.

Carpenter84

Re: I need some electrical help
« Reply #11 on: February 17, 2020, 07:49:26 AM »
Need more info. Can you specify which wires are where on the switches?
I assume the start switch latches the contactor, and the stop interrupts it. I can help sort out where the wires go if I know which is which and what terminal is what. However, someone like, ken, who's seen a lot more of these older industrial contactors, may know where the wires go just based on a quick look and memory.
Shawn

First 9x42 column mill,
Enterprise 10x28 lathe,
Ko Lee 6x12 surface grinder,
Airco dip/stick 160 welder,
Fully stocked wood shop.

4GSR

Re: I need some electrical help
« Reply #12 on: February 17, 2020, 09:17:32 AM »
They appear to be hooked up correctly.  We need to see how they are connected on the push button switch.   Also make sure that L1 and L2 have a tap coming off of them for powering the control circuit. Also make sure that you have 240V 3-phase coming in to the machine since the coil is 240 volt.  Also check the motor wire connections to make sure they are connected properly.  Should be four bundles of wires in the pecker head.  If there are six, it is connected for 480 volts!
Ken

Jake Parker

Re: I need some electrical help
« Reply #13 on: February 17, 2020, 09:40:03 AM »
I have mounted the relay in a new box as yall suggested.
The original start stop switch is crussty and crappy.
I have a new one I would like to re locate to a more convenient location on the lathe.
Will this work?

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Jake Parker

Re: I need some electrical help
« Reply #14 on: February 17, 2020, 09:41:53 AM »
If that switch will work, Im assuming
L2---s/s switch line---s/s switch load--- terminal 2 on the coil of the relay?

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