REV/OFF/FWD Drum Switch Wiring

[YYCHM]

I have a 1 PH 120 V 1/2 HP motor that is wired as follows.

P1 to Line

P2,T8, T3 joined

T5, T2, T4 to Line

Swap T5, and T8 to change FWD/REV

And a 6 contact drum switch that switches as follows.

REV

1 - 2
3 - 4
5 - 6

OFF (no contact interconnections)

1 2
3 4
5 6

FWD

1 - 3
2 - 4
5 - 6

How do I wire this up using 4 conductors to the motor? I think I have figured out how to do it with 5 conductors.

Can't post images tonight for some reason?

 

[YYCHM]

5 conductors does no include a ground, so I would have to run 6 conductors total.

Is there no clever work around for this?

So far I have come up with

T5 to contact 1

T2, T4 and Line (Neutral) to contact 2

P2, T3 to contact 3

T8 to contact 4

P1 to contact 5

Line (Hot) to contact 6

 

[RobinHood]

I have done this exact same thing before. Drew a diagram - but can’t remember where I put it right now.... I’ll let you know if/when I find it.

 

[Brent H]

Hey @YYCHobbyMachinist :

You will need a 3 conductor up to the switch from the phase convertor pins for common, reverse and Forward:

Then you run a separate 3 conductor from the 3 phase output to the motor.

 

[Brent H]

All you are doing with the switch is connecting the common to the FWD or REV pins so that the converter can switch the phases up inside itself. Run a separate 3 conductor to your motor. If it runs opposite to what you configured, just switch 2 phases at the VFD and you should be good.

 

[YYCHM]

@Brent H It's all single phase 120 volt. No VFD involved.

 

[Brent H]

Ah - sorry my bad - LOL. Did not we do the single phase reversing switch last year some time? Maybe with @Chicken lights ?

 

[YYCHM]

Ah - sorry my bad - LOL. Did not we do the single phase reversing switch last year some time? Maybe with @Chicken lights ?

Good point, I'll look through David's thread again. As far as I know, he never did get that lathe running and I recollect suggestions that he bypass the cabinet wiring until he had the motor wiring figured out.

BTB - What kind of internet device are you using that you manage to post an image?

 

[Brent H]

@YYCHobbyMachinist : I posted the picture through my phone - do the typing on the main computer, the site saves my typing, upload a picture and then finish off my blurb. The pictures are all flipping sideways unless I rotate them on the phone.

I will try and post one from the main computer:

That was a png image

 

[Janger]

test

 

[Janger]

test2 yup can't upload images.

 

[Jwest7788]

Here is a picture of a cable as a test!

 

[Jwest7788]

I think it's fixed!

 

[YYCHM]

Motor wiring

Switch

 

[Tom O]

Test

 

[Brent H]

This work for you @YYCHobbyMachinist :

 

[YYCHM]

This is the only solution I have been able to come up with......

But it requires 5 conductors (6 with ground) from the switch to the motor. Yuck!!!

 

[Brent H]

Indeed, but you should be able to do it with 4 if you leave the neutral in the motor :

 

[YYCHM]

This work for you @YYCHobbyMachinist :

Those work but I'm trying to keep the number of conductors between the switch and motor to 4. Was hoping some one had a hocus-pocus AC solution for this.

When I disconnected the switch from 3/4HP GRYPON motor I discovered that the motor ground wire was tied to incoming neutral (not the incoming ground) in the switch??? Does that sound legit?

I found this....

But not sure it makes sense. It's also not indicating any P1 or P2 designations?

 

[Brent H]

Well, for a 120 volt load the ground and neutral are coming from the same panel location but it is not proper wiring to connect them at the load.

The drawing I sent above you run 2 conductor to the motor and 4 to the switch