Controller short circuit phase wires

[lithail]

I have a kids atv that comes electric. It’s 36v with a Kelly controller.

The previous owner managed to melt the phase wires together. I was wondering if some one can tell me what to test the controller for when the phase wires short circuit.

I was thinking the mosfets?

I would like to try and repair the controller.

Thanks in advanc

 

[lithail]

 

[fechter]

If you use a meter in ohms or diode check mode, measure from each phase wire to both red and black battery wires. Swap the meter probes on each measurement. All 6 combinations should measure like a diode. A shorted FET will look like zero ohms in both directions. If all of them look like a diode, the FETs are probably all good.

 

[Elias lector]

Just speaking from experience. When my hub motor spun the axle and it shorted the phase wires my kelly exploded one mosfet and melted another. I only had it set to about 36% power at the time, only reason I mention that is because maybe I'm wrong but I would think that means less power is going in and out of the mosfets. I don't think they like it very much when you tickle the wrong parts at the wrong times.