Wiring a GMF 8" grinder motor
Hi all
I've been reading some of the threads over the last couple of days about electric motor wiring, and I am hoping some of you experts might give me some clues.
I've been given an oldish GMF 8" double ended bench grinder (1/2 HP, 2850 rpm, single phase) that has the switch missing. It has a square metal capacitor attached to the base plate.
It has three wires coming out of the motor body - blue, yellow and black. From reading Gerhard's information in a post in August, I am guessing that one of these wires is the common active to both windings, and the other two are the neutral returns from the windings. I also understand that the capacitor needs to be wired in series with the auxiliary winding.
The first question is, how do I find out which wire is which?
I have checked the resistance between the three wires as follows:
blue to black - 6.3 ohms
Blue to yellow - 63 ohms
black to yellow - 70 ohms.
The wires all look to be the same thickness.
Can anyone offer any suggestions, please?
cheers, Colin