Re: 3 phase motor math

Can you run a larger motor than a VFD is rated for, ie. run a 5HP
motor from a 1.5kw VFD ?
ie. can you limit the voltage / current output from the VFD ?

Could a VFD be used to run an AC servo ?

Thanks,

Rab

> Abby,
>
> If you hook it up to the VFD with the motor under no load, it will
> almost certainly spin up if it is in either Y or Delta. Then all
> you need to do is use the current monitor on the VFD to see if

it's

> pulling enough current. Obviously if it is currently wired Y it

will

> pull less current and be weaker than it should be.
>
> It just happens I have a motor on my bench at the moment where I've
> had to do exactly this, as like yours the terminals are buried deep
> in the motor (mine was Y and weak and needs butchering to get at

the

> terminals!)
>
> Andrew Mawson
> Bromley, Kent, UK