Gallery, Projects and General > How do I??

running single phase motor backwards

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Darren:
Thinking about it the motor leads are the new wiring colours, I guess the motor is fairly new.

The fact that they have not used two black leads to the motor and instead used brown and blue makes me think that this has been done so the guy assembling it gets the connections the right way around for the machine it's fitted to.

So it may well be reversible, only one way to find out  :zap:

Bluechip:


What you appear to have is a Cap. Run motor

You need to identify the ends of the windings, and, on the diag.

EITHER  reverse A1 and  A2  OR   Z1 and Z2.

The designations are common, but not universal, on UK motors.

The motor will not reverse by swapping the AC input.

If you have ANY doubts, as John H. said ... Get an Electrician to do it.

Dave BC

Darren:
Dave's right, as usual, swapping the wires over will do nothing for you..... :doh:

My motor has four wires, yours has only two so the connections you need to get to are inside. Might be more trouble than it's worth.

jim:

thanks for the replies. :thumbup:
its looking that way :doh:
i'd swap the wires on the "cap", but i can see that going pop!!!

i'm not going to try pressing out the windings as i'll bust sumat i'm sure :lol:

i know i could just go down the diy stores and buy a new bench grinder for about £15, but they are only 150W, this motor is 500 or 600W. i need the power as i'm using solid "scotch brite" wheels for deburring/first polish on stainless.

i'll just have to run a new spindle on the fan end.

i'll let you know how i get on :thumbup:

Darren:
I doubt the cap has a polarity as it's seeing AC mains ?

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