r/Machinists • u/Traditional_Exam7804 • 10h ago

DPS troubleshooting

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I’ve had this setup working at my last rental, (with the exception of the occasional blown fuse from high inrush amps upon startup) have acquired slow blow fuses for my shutoff switch since. I upgraded to the next size DPS from this same company and had my electrician set it up the same way.

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1

u/Rob_in_Tulsa 10h ago

Not an electrical guy but I would say you aren't getting enough juice to the machine. Do you run a transformer?

1

u/Traditional_Exam7804 7h ago

Using a cheap digital phase converter. I read they could work with low hp applications.

1

u/xatso 10h ago

Maybe missing one of the three power legs? (3 Phase power supply)

1

u/Traditional_Exam7804 7h ago

I meant to add this to op I’m using those one of those cheap digital phase converters here’s the product

https://a.co/d/02pnKvFB

And this one was the old one that I had the setup working with, but occasionally popping fuses from inrush amps

https://a.co/d/0jh1paqk

1

u/xatso 7h ago

I have used rotary phase converters and found them to be reliable. All are supplying 5hp motors, one each. You buy the model that matches the motor to be used.

1

u/Traditional_Exam7804 7h ago

Any brands you would recommend?

2

u/xatso 7h ago

I have one home brewed and two "American Rotary" brand. I ran three 1990s Hurco knee mills on them. For about 20 years. They all still work well. No problem running them simultaneously on a 100 amp single phase meter.