Your spark will probably have a clamp meter to check how much current its drawing. Overloads are connected to the output side of the contactors and set to the max amp draw of the motor 17 amp in your case I believe.
Ok thanks. is there anyway that its something to do with the fact the contractors are pulled in electronically maybe and we are confusing it with the switch? Just an idea? Used it probably 50 times last night manually and no probs done it with the switch sometimes once,twice,three times and tripped hence why we figured the switch was faulty
Are you using the original contactors? If so, check the voltage of the pull-in coils (the coils you put power into to make the contactor work).
What I mean is, I had a 3-phase lathe with 415V pull-in coils. I fitted a single phase motor and used the original coils but they would not pull in at 240V, they just chattered. I had to unwind a bunch of turns off them to get them to pull in properly.
Could have used a step-up transformer I guess but I like to be awkward
Oh, as Eil said, I had to also bypass the overload.
Hi people just and update seems the switch was the problem have fitted new switches and all seems well have even ran it with the compressor going aswell and has not tripped the breaker once yet (fingers crossed) will hopefully get finished installing it today and get a Car on there to give it a proper test but was defo the switch at fault and no the contractors were new 240v ones
Still wondering what could of caused the cap to blow guess if the switch was trying to spin it both ways at the same time could have done it but have used it about 50 times and not tripped yet so hoping will lift a car and all be well
Nice one kj, just remember to treat it gentler than a three ph one ie no up and down like a fiddler`s elbow don't forget to get some overload protection on it.
Although I've had no input in this thread I'd just like to say well done all for your perseverance, I think it's a defining characteristic of this forum that rarely a thread goes dead without conclusion. High fives all round.