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Help with dewhurst wiring

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Alan Waddington 204/08/2018 17:22:08
460 forum posts
86 photos

ok, ive got the basic diagram, but no amount of web trawling brings up a diagram showing a start capacitor and centrifugal switch. Can anyone do me a diagram showing how to connect these into the circuit.

Have had it running both forward and reverse, but running for a minute or so in reverse blew the start cap, so i’m guessing how i had it wired wasn’t dropping the capacitor out when reversed.

This is the basic schematic im using.

TIA.......been at it a couple of hours now with no joy, and ive gone wire blind now

995f1170-8a42-43c6-b57a-5df8973d4994.jpeg

NJH04/08/2018 17:34:34
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2314 forum posts
139 photos

Hi Alan

Have a look in my photos for one called “Myford Reversing” - all should then be clear

Norman

Edited By NJH on 04/08/2018 17:35:21

Les Jones 104/08/2018 17:51:19
2102 forum posts
144 photos

The main winding is connected to terminals 5 and 7 on the Duhurst switch.. The start winding with the centrifugal switch and capacitor in series with it connect to terminals 2 and 6 on the Dewhurst switch. You may need to post pictures of the connection box on your motor if the above information is not clear.

Les.

Alan Waddington 204/08/2018 17:53:46
460 forum posts
86 photos
Posted by NJH on 04/08/2018 17:34:34:

Hi Alan

Have a look in my photos for one called “Myford Reversing” - all should then be clear

Norman

Edited By NJH on 04/08/2018 17:35:21

Cheers Norman, but im still not getting it sad ......could be time for a beer

Alan Waddington 204/08/2018 18:00:35
460 forum posts
86 photos
Posted by Les Jones 1 on 04/08/2018 17:51:19:

The main winding is connected to terminals 5 and 7 on the Duhurst switch.. The start winding with the centrifugal switch and capacitor in series with it connect to terminals 2 and 6 on the Dewhurst switch. You may need to post pictures of the connection box on your motor if the above information is not clear.

Les.

Mmhh, that’s how i thought i had done it.......will have to order a new capacitor and try again. Thanks for the help chaps, will report back in due course.

JohnF04/08/2018 19:06:20
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919 forum posts
114 photos

Alan W please PM me with your email and I'll send you the original info on PDF files -- would put it on here but cannot up load PDF's plus maybe infringe copyright ?

John

Alan Waddington 211/08/2018 17:34:32
460 forum posts
86 photos

Just an update, to thank everyone for their help. Turns out i had wired it correctly, must have just been bad luck that the capacitor decided to self destruct. Fitted a new one this morning, and checked with meter that it was dropping out in both forward and reverse directions.......All good, and no smoke escaping. cheeky

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