110v electrical requirements

1

What size wiring is needed for an Elite series machine with a 110v spindle? Circuit breaker amperage also please.

2

@Johnny1 I didn’t see an answer to your exact question, but if you haven’t seen it, Redline CNC does have a FAQ page that recommends two independent circuits (different breakers) and suggests that GFICs will trip when used with the VFD that powers the spindle.

1,500 Watts @ 120 Volts is 12.5 Amps. That is 83% of a 15A circuit or 63% of a 20A circuit. I’d use a dedicated 20 A circuit.

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3

Do we know the power draw of the VFD itself? I only have two circuits in my basement so I was thinking of doing the spindle and VFD on a dedicated circuit, and then the other circuit would be for the Masso motors, Masso controller, and dust collector. I think I read somewhere that the Masso motors draw about 4 amps

4

The VFD powers the spindle. Since it is a 1.5 KW spindle I would assume 12.5 Amps drawn from your basement circuit. This doesn’t include peak currents which may be higher but short in duration.

Onefinity’s manual for the Elite states that the power supply (stepper motors & Masso) has a 10 Amp fuse. Plus there is a 10 Amp fuse for a Onefinity controlled vacuum.

  • Circuit 1: VFD / Spindle: 15 A min, 20 A suggested (my opinion)
  • Circuit 2: Onefinity Power Supply (Masso, stepper motors) 10 A (See topic)
  • Circuit 3: Shop vacuum 10 A (sounds like you may need to combine this with circuit 2)
  • Circuit 4: Lighting (you don’t want the lights to go out when a tool trips the breaker).

These are my thoughts. I realize you’d like a documented answer from Onefinity.

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5

A 20A breaker is probably safe, but I definitely wouldn’t go lower.

The power requirements depend on how they’re defining the spindle power. Is it the mechanical power at the collet converted to kW or the power consumption of the VFD? If it’s the first (the correct way to measure spindle power), that wouldn’t account for the efficiency of the VFD and the breaker may need to be larger than 20A.

Hopefully, they’re not doing like some of the cheaper Chinese manufacturers do to make their spindles seem more powerful: using the VFD power consumption, but not informing buyers that they’re advertising peak watts (W × ~1.414) rather than rms watts. Though, a 15A breaker would be sufficient if that was the case.

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6

Thanks for your help.