Need some help please to check a problem, on a J-head Bridgeport with2-speed motor.
Contactor C3 for spindle motor should be normally open shouldn't it? - and then latched closed under signal power from (momentary) PB1 push button for motor start?
I'm getting continuity across both terminals of PB1 all the time, whether it's pushed or not. I've taken the switch apart, and the mechanical side is working as it should, i.e. closed until pushed, so I'm thinking the problem may be with the contactor.
Was operating it as usual last week, stopped to change drill sizes, then when I went to start the spindle motor again it tripped out the MCB on the fuse box, and had done the same everytime since.