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Reply to "SOLVED 9/02/2022: PS 3 powered locomotive abruptly stops and restarts after 3 minutes running"

Well, if you could find one of the modified PS32 boards for one-gauge, those were beefed up with a heatsink on the motor driver FET, that would probably be one to try if you wanted to swap boards.

Not a first choice, as I could not find one, AND I would have to change all the lights

If you want to stick with the PS/2 board, adding a heatsink to the driver FET,

Could I prevail upon you to show me where the driver FET is?

even if you have to dispense with the plastic carrier, might be a smart move.

I had actually considered that, but need to know where the critical components are to make sure I have decent high thermal conductivity path

I'd also make sure the bridge rectifier has a GOOD heatsink, perhaps a custom one with a better bond to the chassis.

Same request about the bridge rectifier

Those are the two high current critical components in the motor drive circuit.

Thanks in advance!

Truthfully, I think just blowing air on it with a tiny fan is going to be a lot less effective than better heatsinking.  Adding the fan as well can't hurt...

Last edited by John Sethian

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