Myford ML7 motor wiring

[Ian SymesParticipant @iansymes12360]

Hi Les.

C – 3 when the switch is in reverse.

In the diagram showing the connections that run in forward and reverse, in both cases the switch is in the forward position.

Ian

[Les Jones 1Participant @lesjones1]

Hi Ian,
If terminal 3 does not show continuity to any other terminal in the forward position then I think the switch is faulty.

Les.

[Ian SymesParticipant @iansymes12360]

Hi Les.

I could take the switch apart but I would like to know what to expect.

If I open it and lots of bits fly out I wont be able to use the lathe at all., I've not seen any pics on line so I might have to get a new switch. I'll give it some thought.

Thanks Les.

Ian.

[Les Jones 1Participant @lesjones1]

Hi Ian,
Like you I have never seen one of these switches and would be cautious about taking it apart. I don' suppose that you live anywhere near me ? If you do I could have a look at it sometime. If you gave an rough idea in your profile of your location there might be someone near enough to offer help.

Les.

[Ian SymesParticipant @iansymes12360]

Hi Les.

I live in Dorchester, Dorset.

A long way from some of the model shows I'd like to visit.

Ian.

[Les Jones 1Participant @lesjones1]

Too far away from me Ian !

[Ian SymesParticipant @iansymes12360]

Hi Les.

Not a problem, I'll find away round it.

Ian.

[Les Jones 1Participant @lesjones1]

Hi Ian,
Here is one possibility if it can be made to fit physically. Here is the electrical data on this range of switches.

Les.

[Les Jones 1Participant @lesjones1]

Hi Ian,
I have been looking at the way the switch works. There must be 5 contact sets. Each contact set is on a layer of the switch. I will call the front layer layer 1. Terminals C, 3, and A are actually connected to 2 layers each. (You can see the metal connections from 2 adjacent layers bent together.) Terminal C goes to layers 1 & 2. Terminal 3 goes to layers 2 & 3. Terminal A goes to layers 3 & 4. The contact that I expected to be closed in the for forward position of the switch (Terminals 3 and A) must be the contact set on layer 3 Are you sure that the screws in terminals A and terminal 3 were tight when you did the test. If not there may not have been a connection the layer contacts. I would suggest repeating the test with all the terminal screws tight.

Les.

[Ian SymesParticipant @iansymes12360]

Hi Les, Thanks for the information. I will re check the terminals this afternoon.

Ian

[Ian SymesParticipant @iansymes12360]

Hi Les

The contacts A-3 had an intermittent connection.

I took the switch apart and the connection between A & 3 is now good.

Ian

[Les Jones 1Participant @lesjones1]

Hi Ian,
This is how I suggest connecting the switch /motor.

1 Start winding Motor terminal R (Red wire ??)
2 Live in
3 Start winding Motor terminal S (White wire ??)
A Live in
B Run winding Motor terminal U1
C Run winding Motor terminal U2 Also neutral in.

Note live in goes to 2 terminals. Also neutral AND U2 connects to terminal C

This is on the assumption that the only continuity between the switch terminals are the ones that you originally listed plus 3 to A in forward and C to 3 in reverse.

This is how I understand the switch works.

Forward B to 2, C to 1, A to 3

Reverse B to 2, C to 3, A to 1

I think there were some errors in your original tables of connection and I cannot see on the picture of the motor terminals which colours go to U1 & U2 (I think it is blue and green but I do not know which way round.)

If you find forward and reverse are the wrong way round then swap over the wires that go to S & R or U1 & U2 (BUT NOT BOTH)

By the way when I was looking closely at the pictures of the switch to try to understand how it worked I noticed it was made by "Santon" NOT Stanton.

If you took any pictured of the disassembled switch I would be interested in seeing them.

Les.

Edited By Les Jones 1 on 27/09/2014 14:37:36

Edited By Les Jones 1 on 27/09/2014 14:38:30

[Ian SymesParticipant @iansymes12360]

Hi Les,

Thanks for the list of connections, I hope to try them later today.

I do have some photos, only one of them is in focus. I will reduce them and put them on the post.

Ian.

[Les Jones 1Participant @lesjones1]

Hi Ian,
I will PM you with my email address so you can attach the picture files to an email.

Les.

[Ian SymesParticipant @iansymes12360]

Hi Les,

I went back to the motor and found one of the black cables should have been S and not U2. As labeled in the terminal box.

Then following your connections it all worked. Forward and Reverse, wonderful .

Thank you Les.

I'll send the photos tomorrow when I will be able to reduce their size.

Ian.

[Les Jones 1Participant @lesjones1]

Hi Ian,
I have sent you a PM with my email address so you can just email the pictures if that is easier. What did you have to do to fix the intermittent contact set between terminals 3 and A ? It's nice to now it's all working. The OP that started this thread did not have the manners to post the outcome of his problem. I would even prefer it he came back complaining that we all gave him rubbish advice.

Les.

[Ian SymesParticipant @iansymes12360]

Hi Les,

I have sent you the switch photos.

I wiped the internal end of all the contacts and around the tufnol plates, they are sprung together did not see how. It all works fine now.

Thanks Les.

Ian.

[Les Jones 1Participant @lesjones1]

Following the resolution of this problem I have put the information learned about this "Santon reversing switch on my "Weebly" website.
**LINK**
Hopefully this will help others in the future.

Les

[Kevan ShawParticipant @kevanshaw32462]

Lest

Totally helpful ! I am in the process of wiring up a Stanton switch on an old ML7 and couldn't be doing it without your information A big thanks!

Kevan

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