Re: Variable frequency drive question

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Hugh Prescott"
<hugh345@a...> wrote:

> Not familar with that drive but in general VFDs
>
> Line voltage will equal output voltage although some allow a small

range of

> output voltages to be selected
> Like 220 in 208 out or 240 in 220 out etc.

Check the manual. Some current VFD's will allow a 220 single phase
input and will run a 440 three-phase motor.

<snip>

> You can use a higher rated VFD with a smaller rated motor but not

the other

> way. Small mismatches may be tolerated.

Check the VFD's current rating. you can run a motor 'up to' that
rating.

I have used many, many 20hp drives to run 30hp motors up to about 80%
of the rating of the DRIVE (not the motor) and then for full speed,
switched over to directly to line voltage. Think of it as a soft
start with low speed capablities.


<snip>

>
> The VFD manual is you friend and the VFD's lifesaver.

AMEN !

>
> Hugh
>