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DOL starter switch

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clogs17/09/2018 17:41:32
626 forum posts
12 photos

Having trouble with placing photo's on the forum.....the search box is no help....

have replaced the 3ph starter push button on/off switch on my Colchester lathe....

the photo's would explain better but the main wires are no problem...all wires coded by me before disassembly and the switch box's )old and new) use the same wiring term problem is with the reverse switch......just 1 wire......

not fired it up yet as don't want to burn anything out.......

So help with the photo placing would be great help anyway but an offer of private email help would be just the ticket, if there would be someone so kind to help......

I live in the boonies and there is no chance of finding a 440volt electrician even if I wanted........

I'm not completely helpless but just I say the photo's will explain's just I'll have a job to do quite soon..........

thanks for looking.....Cl;ogs

Neil Wyatt17/09/2018 18:20:27
19079 forum posts
736 photos
80 articles

Hi Clogs.

Click all topics.

Choose the top of the list:

Website FAQ's
Information about where to put postings, etiquette, and general guidance. Information on posting classified adverts.

Then choose the top of the next list:

STICKY: How To Post Pictures and Create Albums
The definitive guide? By Neil Wyatt


Neil Wyatt17/09/2018 18:22:07
19079 forum posts
736 photos
80 articles

I've added the word 'photographs' to both to make it more obvious.


Robert Atkinson 217/09/2018 19:07:56
1251 forum posts
20 photos

To reverse a 3 phase motor you just need to swap two phases of the supply, any two, it doesn't matter which two wires you swap.


clogs17/09/2018 19:27:51
626 forum posts
12 photos

thanks R. Atkinson,,,,

actually know that one but the reverse switch is wired thru the the odd wire...

will try tom. to get some photos on the forum.....

ta Clogs

john swift 117/09/2018 20:00:57
318 forum posts
183 photos

Hi Clogs

is this what your looking for

forward reverse motor control diagram.jpg


Les Jones 117/09/2018 20:05:56
2261 forum posts
156 photos

Hi clogs,
If you still can't post pictures on the forum with the help from neil's links the PM me and I will give you my email address so you can send pictures as attachments. If you can post the schematic as it is shoing the origin of the wire then it should be possible to work out where it should be connected. It could just have two of the three phases in and out and the third phase just bypassing it. it could also have the three phases in and out. If it has a centre off position it could be one of the previous ways plus two wires that cause the main starter to drop out in the centre off position. This would stop you from going straight from one direction to the other.

EDIT. I've just noticed John's post with the schematic that uses two cantactors, one for forward and one for reverse. Is yours like this or does it have a single contactor plus a reveresing switch ? (As opposed to a forward, a reverse and a stop button.)


Edited By Les Jones 1 on 17/09/2018 20:11:49

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