Re: [CAD_CAM_EDM_DRO] VFD's

Jon -

Do you think it would be a problem running a 1.5 HP motor on a 3 HP
inverter?

Mike

Jon Elson wrote:

>
> Tim Goldstein wrote:
>
> >Check the specs. Many of the VFDs require you to derate them by 50% when run
> >on single phase so that for a 3 hp application you would need a 6 hp or more
> >VFD. I have never seen a 6 hp so you would go to a 7.5 hp.
> >
> >
> Running a 1.5 Hp motor on a 7.5 Hp drive may cause problems. The VFDs
> are tuned for the motor
> inductance, and a 7.5 Hp motor has a vastly lower inductance than a 1.5
> Hp. This can cause problems
> with the PWM schemes they use to approximate the sine wave. Also, the
> current limits may not go
> low enough to protect a 1.5 Hp motor.
>
> Jon
>
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