Random droput of ps_on during print

I've selected POWER_SUPPLY 1 and enabled AUTO_POWER_CONTROL, taken 5v from RAMPS to SSR to ps_on, and it generally works fine... except partway through a print the PSU goes off for about 0.2s, which loses XY position.

When I connect the SSR -ve direct to ground instead of ps_on it all works perfectly - minus the auto control.

It's like the AUTO part briefly decides power isn't needed. The SSR apparently runs from 3v upwards so I don't think it's that.

Was wondering if anyone else has had the same problem.

I think I have v1.1.9 Marlin...

Thanks,
Phil

Are you sure this is a Marlin problem, or PSU control problem? Does this happen at about the same time (which would suggest it's a heating issue) or the same XYZ location (which would suggest its a mecjanical issue)?

My first guess is that your heater cartridge wires are shorting, which drops the power supply voltage at the SSR enough to reset it.

Sorry, had trouble finding my way back to this thread!

It was a total screw-up on my part and was the actual mains supply to that power socket dropping out!

Fixed the house and now the power control works a charm.