Re: [CAD_CAM_EDM_DRO] Inverters/phase converters

To make use of the higher 440 volt rating, you have to run a single phase
step up transformer on the 220 volt single phase input in front of the
inverter and you have to change the motor wiring to run at 440 (almost all 3
phase motors can be run at 220 or 440 depending on how the leads are
connected).

> These units do not convert voltage. You run 240 V motors with a 240 V
> input,
> and a 240 V rated inverter. You run 440 V motors with a 440 V input,
> and a
> 440 V inverter. In theory, you could run a 240 V motor from a 440 V
> inverter
> with 440 V input, and program the motor for 240 V at 60 Hz. But, you'd
> need a 2 Hp inverter to run a 1 Hp motor, as the current doubles when
> the
> rated voltage drops to half. Just look at the rated current on the
> nameplate
> of a dual voltage motor. Also, the 240 V motor has 1/4th the inductance
> of
> a 440 V motor, so the PWM peak current will not come out right at all
> for
> a 440 V inverter running a 240 V motor, and you would likely get false
> overcurrent trips. So, you really get no benefit, and will pay extra,
> to be
> back where you started from.
>
> Jon
>
>
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