Thread: Sparkologist Fault Finding from afar

I suspect you have a high resistance joint in the wiring on the neutral line between km 2 and km 3.

it will be allowing enough current to pass for the transformer to work to a point, but not enough to energise the contractors.

When you over ride them as the path to neutral is still valid for km 1 and km 2 they will allow the main motor to run, when you manually operate km 3 there is no valid neutral so the amps have nowhere to go, both sides of the motor are at active potential.


But that's just my first guess.

So, are you saying the spindle turns when you press SB3 or SB4 and the pump doesn't run when you switch SB5?

Thanks Dave Ill investigate that (I assume you mean in the 240VAC nuetral line)

Mick, the trouble is I dont know enough details from the diagram.
My thoughts were that SB3 / KM1 represented the 24VAC NO switch on the console.
Or is the diagram such that SB3 represents the over ride function of the relay?

I also cant find SB1 or SQ1 or SB2 Im guessing they are switches???????

Motor spins appropriately when forward relay (KM1) is over ridden (little press button in picture attached next to 53E) and reverses when reverse relay (KM2) is over ridden.
But hitting the proper 24VAC NO switches nothing happens.

Thanks

Steve

Dave,
just did some more looking and thinking
I like your assumption - I had thoughts the transformer was bunk but is is making 24VAC across lines 12 and 0 on the diagram. But as you say it may not be making goodly current????

Oh this problem is very new - have been using drill daily for two weeks. Yesterday would have used it for a few hours total - today turned it on at power point and voila not working. No smoke no noises just no worky.

Steve

Steve Disconnect the 24 from the worklight and connect to the contactor direct and see if it works


Noel

My gues is that if your work light is working, you should be able to test for breaks in the common neutral line between the lamp and all 3 relay coils. With the power off you should see very little resistance between the four points at the bottom of the wiring diagram. It's probably a common screw connection that's a bit corroded. If you run a temporary wire from the low side of the transformer to the low side of the relays all should work as normal.

Are they 24v coils on the contractors? How's your multi meter skills?
Stick your meter on A1 on the motor contractor, press the go button and what does it read?

Don't contractors install contactors ?