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Question #: 3592

Question: What wire size between voltage converter and VFD?

Current Solution

Please consult the advice of a professional electrician. The information provided below should always be confirmed by a professional electrician and you assume all risk involved when working with electricity which is potentially hazardous and lethal. Never work with instruments and wiring on live electricity.

The wire gauge used between the spindle VFD and the wall socket, or voltage converter will be determined by the current consumption of the VFD. For example, if the spindle/vfd is rated for 2.2kW and the voltage input is 220V, then 2200W/220V = 10 amps. In this case, it's best to increase the gauge for a current flow to provide a safety factor and consider 15 amps rather than 10 amps. A wire gauge that is too small will cause overheating on the wire and possibly cause the insulation to melt and cause a short. A wire gauge of 14 (copper wire) for 15 amps would be adequate. Remember that the length of the wire is important. The longer the wire, the larger gauge is needed.

It will be very short wires. Maybe 12" long.

14 AWG should be fine.

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Other Possible Solutions to this Question

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    The length of the cable from the VFD (Variable Frequency Drive) to the actual spindle should be about the same as the z-axis cable from the z-axis motor to the z-axis driver which is recommended at 11 feet. This is locating the VFD about at the midpoint of the machine.

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    What length of wire do you recommend for the black toe (2'x4') between the spindle and VFD?

  • What wire size to use from VFD to 2.2kW spindle?

    We use 16 AWG wires between the spindle and the VFD. This wire size has a maximum capacity for 22 Amps, a good buffer to eliminate any possibility for overheating. The 2.2kW using 220V may draw up to 10 Amps (220 x 10 = 2200).

    That is, all three wires are sharing the total current draw.

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    What wire size to use from VFD to 2.2kW spindle?

  • What size of wire do you use to connect the VFD to the spindle?

    The type of wire that should be used between the spindle and the VFD (Variable Frequency Driver also called the inverter) should be of stranded type and we use between 18 and 16 AWG.

    The total current is divided among the three coil wires, therefor a wire gauge of 16 should be sufficient.

    Currently we use 20AWG 4 conductor.

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    What size of wire do you use to connect the VFD to the spindle?

  • What gauge wire between the VFD and the 2.2K spindle? The spindle connection posts are very tiny, equivalent to 18 gauge, but that seems too small. What do you use?

    The type of wire that should be used between the spindle and the VFD (Variable Frequency Driver also called the inverter) should be of stranded type and we use between 18 and 16 AWG.

    The total current is divided among the three coil wires, therefor a wire gauge of 16 should be sufficient.

    Currently we use 20AWG 4 conductor.

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    If the VFD AC voltage input is rated for 110 volts, then 2200 watts / 110 volts is 20 amps, so a 25 or 30 amp breaker will work.

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    what size circuit breaker should I use with the 2.2KW VFD?

  • [79] What size circuit breaker should I use for this VFD?

    The 2.2kW spindle has a power rating of 2.2kW or 2200 watts.

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    If the VFD AC voltage input is rated for 110 volts, then 2200 watts / 110 volts is 20 amps, so a 25 or 30 amp breaker will work.

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    [79] What size circuit breaker should I use for this VFD?

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  • What are the physical dimensions of the 2.2kw VFD?

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    Additional Information:
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