VFD reduced voltage question

[Jester]

Is it possible to use a VFD at half of its rated voltage?

For example VFD rated for 480V in and 5HP used with a 240V source and 2HP motor.

Probably depends on how far down you can adjust the settings?

Anybody do this?

[TheMG]

It will probably complain about insufficient voltage and refuse to do anything at all.

[wasedadoc]

I was briefly wondering what Vacuum Fluorescent Display runs at 480 Volts until I got to the 5HP part. 

[Ground_Loop]

I've run many on single phase input, but never reduced voltage. I'm guessing you'll get a DC bus low voltage fault if you try it.

[Doctorandus_P]

The DC bus will get pumped during braking of the motor (and that is then again bled of via a "braking resistor"). This means that the internal DC bus is a quite important part of an VFD, and all VFD's will monitor this voltage to check if it is in between allowable limits. So it either won't start at all if the input voltage is too low, or it will give you a DC bus error. (Maybe only at the moment you try to start the motor).