[cobra514]

What circuit breaker current rating are you guys using in your service panel supplying power to your Plug and Play NEMA 34 Control Systems (and are you running 115V or 230V)?

I'm worried about the inrush current of the (2) 600W power supplies.

Have any of you that are running this system ever tripped your breaker on power-up?

Anybody put the PNP spindle system and the PNP NEMA 34 control all on the same 230V circuit? What breaker are you using in that case?


Thanks for any input.

[ger21]

It says here the inrush current is 30 amps at 115V, and 60a at 230 (which is wrong, as it should be less at 230V)
SE-600-MEAN WELL USA Switching Power Supply

If you run everything at 230V, it's 15 amps for the power supplies, and roughly another 15 for the spindle. Call or email CNC Router Parts, and they'll tell you what you want to know.

[cobra514]

Yep, that was the datasheet that caught my eye. Thanks for the feedback.

[Tigerflyer]

you don't typically size a breaker for inrush current unless they last way longer than normal. A typical household breaker in a panel will take 140% of the rated load for 10 minutes and a 400% for 10 seconds.

The power supplies also have their own internal overload protection breakers that automatically reset when power is removed.

Sizing your circuit to the nominal loads is fine and is what is recommended in the electrical codes for these applications.

Another point in this discussion is that the spindle is not starting up or working at its hardest when the stepper motors are working the hardest. My Mach3 controller starts the spindle with a 5 second dwell with no motion and the feed rates go down when the spindle is working at its hardest. When the control system is accelerating back and forth, my CNC is not making deep cuts. I have never had my CNC pop a breaker on its 20A dedicated 220V circuit.

[cobra514]

Just the information I was looking for. Thank you much!