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Need advice on motor wiring

Home › Forums › Manual machine tools › Need advice on motor wiring

Viewing 4 posts - 1 through 4 (of 4 total)
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  • 17 September 2011 at 01:48 #75038
    Gone Away
    Participant
      @goneaway

      I have a GE Motor P/N 5KPM40KG78BX

      Label info is: 1/15 HP, 115/230V, 50/60 Hz, 1 Ph, 3450/2850 RPM, Cap 5 mfd

      There are 5 wires (plus ground) exiting the motor: Black – Red – White – Yellow – Green.
       
      There is no terminal block or mounted capacitor (i.e. the capacitor is to be wired externally) .

      Resistance checks show:

      Black – Red = 45.9 Ohms

      Yellow – Green = 20.3 Ohms

      Black – White = 0.6 Ohms

      Black or Red to Yellow or Green = open circuit

      I need to wire this for 115V 60 Hz (including capacitor). It would be nice if I could reverse it too.
       
      I’m guessing that the Yellow-Green pair is the main winding and the Black-Red pair the start winding. I presume the capacitor goes from White back to the main winding. Does that sound right?
       
      What’s confusing is the dual voltage specification on the label …. I don’t see that with the wiring that I have. All I can think is that it’s been wired internally for 115V (presumably since it was bought locally – Canada attached to a small vacuum pump).
       
      I’d appreciate any (relevant) advice.

      Edited By Sid Herbage on 17/09/2011 01:49:13

      17 September 2011 at 01:48 #11822
      Gone Away
      Participant
        @goneaway
        17 September 2011 at 07:27 #75040
        Nicholas Farr
        Participant
          @nicholasfarr14254
          Hi Sid, don’t know if the picture of the rating plate in this link is of any help

          http://chicago.ebayclassifieds.com/electronics/chicago/small-medium-motor-good-for-projects/?ad=12148818

           
          Regards Nick.
          17 September 2011 at 17:57 #75061
          Gone Away
          Participant
            @goneaway
            Hi Nick,
             
            Yes, I had stumbled on that in a Google search and copied the images.
             
            At first glance, it looks like the same motor that I have, attached to the same vacuum pump and the same chassis. I had hoped that zooming in might give me some leads (rotten pun). In fact though, this motor is a different supplier (Fasco rather than GE) so I presume it is an alternative source.
             
            I didn’t really proceed down that path any further but your mention of it brought me back and I did some image processing and zoomed in. As well as some cosmetic differences, there is a slight colour coding difference (the Fasco has a Blue wire, I have Green) but the other colours are the same. The wiring diagram is still a bit indistinct but I’m trying to see if I can reconcile the Fasco diagram with the GE motor.
             
            I had assumed the white wire came via a centrifugal switch to a capacitor connection (hence the slight resistance measured). However, the Fasco diagram has it connected to line so I think now it’s probably coming via the thermal cut-out that the label says is in the motor.
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