Wendelspanswick
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Chances are either the contactor has a 415v coil or it has a 230v coil but it's being powered from the pair that doesn't get full voltage until the motor is up to speed and the back EMF from the motor evens out the voltages.Yes indeed, and another stroke of luck, I see they have a welder/generator I can pinch for testing.
It's not playing ball with my static converter and I'm not totally sure why, the contactor won't strike. I can get it to run for a bit if I hold the contactor in with a screwdriver before the converter fuse pops. I'm overloading the converter really which is only rated at 2hp, the big mill motor is 2.5hp. But there must be something else as it should at least run the little coolant pump.
Anyway, it's a 4pin on the mill and a 5pin outlet on the Genny, I should be able to wire a 5 pin plug on the mill lead and just leave out the neutral ..... Right? Just for testing at the moment, need to check it all works before I tear into it
Try swapping the wires in the plug, you want full voltage to the coil and the motor to rotate in the right direction.