Re: [CAD_CAM_EDM_DRO] VFD superceeds Motor Starter?

I have worked with about 3 different brands of VFD.
A couple of things not to do: DO NOT put a switch between the VFD and
load . Do not switch the power into the VFD to control the ON-OFF.
All the ones I worked with had automatic shut down in the event of an
overload. I have 2 of them a 2HP and a 5HP. I power them from 220V
single phase and they out put 220v 3Phase but at half power. Meaning I
run a 2hp motor on the 5HP and a 3/4 HP on the 2HP. There are a lot of
neat features on them.

Bob

scyvt wrote:

>
> Electromechanical motor starters, as have been in general use for at
> least 70 years, offer motor protection from overvoltage, undervoltage,
> and overcurrent. From an operator safety standpoint, perhaps the most
> important feature is no-voltage protection; that is, if there is an
> interruption of power, the machine will not automatically start up
> when power is restored.
>
> Modern electronic VFD's offer all the above functions, plus of course
> variable speed and a raft more. But are they considered as reliable as
> the time-tested electromechanical motor starters as far as guarding
> operator safety? In other words, can I use a VFD alone where a motor
> starter was used before?
>
> TIA
>
> Steve
>
>