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Motor Start Circuits
Posted: Wed Sep 21, 2016 5:30 pm
by everettdavis
There have definitely been a thousand words or more trying to explain the various motor manufacturers and start circuits different Shopsmith models through the years.
Here is a graphic that may help visualize them in a manner that is helpful for most who have a basic understanding, and need just a bit more to visualize it.
Everett

- Circuit to Motor.png (54.26 KiB) Viewed 10332 times
Re: Motor Start Circuits
Posted: Wed Sep 21, 2016 6:07 pm
by ERLover
Thanks, you pic and explanations made understanding the start/run process very easy.
Re: Motor Start Circuits
Posted: Wed Sep 21, 2016 6:49 pm
by UncleSnick
Everett,
This is Perfect!! I just completed a reverse job with much help from posts from Joshh (
https://www.shopsmith.com/ss_forum/main ... ml#p144285) and Bill Mayo. Thanks Josh and Bill!
Without the vision of what was going on internally in the motor, it was a leap of faith when I cut the wire where the power wire attaches to the run windings(2) and start winding in the motor. This is a great addition!
Re: Motor Start Circuits
Posted: Wed Sep 21, 2016 6:58 pm
by JPG
A couple of pesky details:
There are TWO run windings.
The order of the start winding/start switch/capacitor is not important, but they must be in series.
The graphic is excellent for gaining understanding.

Re: Motor Start Circuits
Posted: Wed Sep 21, 2016 7:51 pm
by jsburger
JPG wrote:A couple of pesky details:
There are TWO run windings.
The order of the start winding/start switch/capacitor is not important, but they must be in series.
The graphic is excellent for gaining understanding.

Schematics/wiring diagrams are essential to understanding any piece of equipment. It is almost impossible to trouble shoot something if you don't know how it is put together (wired).
Thanks Everett.

I am sure your diagram will help many here.
Re: Motor Start Circuits
Posted: Fri Jan 20, 2017 1:59 pm
by everettdavis
Here is a graphic representation that includes two run windings. It is not a formal schematic, it is a graphic representation to aid in visualization.
Everett

- Circuit to Motor with 2 Run Windings.png (54.81 KiB) Viewed 10003 times
Here is a typical Shopsmith motor start relay into which I inserted a schematic representation for connections.

- Motor Start Relay with imbedded Schematic.png (1.14 MiB) Viewed 10001 times
Re: Motor Start Circuits
Posted: Mon Jan 23, 2017 5:53 pm
by everettdavis
John,
Here is something I put together last year for a more traditional schematic representation of the motor circuit(s) that has both sets of windings.
Everett

- General Schematic for Capacitor Start Motor with Start Relay or Centrifugal Switch.png (60.26 KiB) Viewed 9931 times
Re: Motor Start Circuits
Posted: Mon Jan 23, 2017 6:09 pm
by jsburger
everettdavis wrote:John,
Here is something I put together last year for a more traditional schematic representation of the motor circuit(s) that has both sets of windings.
Everett
General Schematic for Capacitor Start Motor with Start Relay or Centrifugal Switch.png
Yes, perfect!!!
Re: Motor Start Circuits
Posted: Mon Jan 23, 2017 9:00 pm
by JPG
jsburger wrote:everettdavis wrote:John,
Here is something I put together last year for a more traditional schematic representation of the motor circuit(s) that has both sets of windings.
Everett
General Schematic for Capacitor Start Motor with Start Relay or Centrifugal Switch.png
Yes, perfect!!!
Almost. Usually only one start winding or they are in series.(i.e. only two wire ends) Meaning quite clear as is.
Re: Motor Start Circuits
Posted: Tue Jan 24, 2017 10:27 am
by everettdavis
Good catch JPG. One of my mentors corrects me!
Here you go.
Everett

- General Schematic for Capacitor Start Motor with Start Relay or Centrifugal Switch - corrected.png (59.52 KiB) Viewed 9871 times