Mazak Qt screen pulsing on phase converter

Ralph@NES · Nov 30, 2019

Have my old QT with a T plus control wired up on a 230 3ph converter with the transformer tapped appropriately. The screen "pulses" significantly. At the moment I can't tell if it's possibly under current, out of phase or just a failing display (seen that happen before). I really don't want to fire up all the systems fully if it's a low current or phase condition. Any suggestions from experience or should I just begin troubleshooting the old fashioned way (clean 110 to the processor/screen and bypass the xformer, phase testing, et al)?

Thanks. Have a short video which I'll link shortly.

rons · Nov 30, 2019

I will assume that the 230 3ph is being used to power the display through a step-down transformer.

Use a line filter before the electronics.

JST · Nov 30, 2019

If the phase converter is an RPC, and the display power is single phase, see if you can get the display power connected to the two "pass-through" legs, and not the manufactured leg, which is less stable and may vary the voltage with load.

hitandmiss · Dec 3, 2019

The bigger issue is the transformer Wye or Delta on both the Primary and or Secondary.
A Wye connected transformer (primary or secondary) moves manufactured leg instability to all 3 phases.
So it would be best to add an appropriate single phase transformer to power all single phase loads, connected to the power company phases at the primary of the 3 phase transformer.

Bill

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Mazak Qt screen pulsing on phase converter

Ralph@NES

Plastic

rons

Diamond

JST

Diamond

hitandmiss

Titanium

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