Creating 300VAC for 3 Phase Variable Frequency Drive Testing

[romo84]

Hello all,

I have a 3 phase Variable frequence drive that requires an input voltage of 380-480VAC. I would like to test what would happen if I apply 300VAC to the drive.

I have access to 208V and 440V. Is there anything I can do to obtain 300V? I have thought about a variable power supply but at that voltage they are hard to find.

Thanks,

 

[jegues]

Hello all,

I have a 3 phase Variable frequence drive that requires an input voltage of 380-480VAC. I would like to test what would happen if I apply 300VAC to the drive.

I have access to 208V and 440V. Is there anything I can do to obtain 300V? I have thought about a variable power supply but at that voltage they are hard to find.

Thanks,

Why can't you simply step down the 440V to 300V with a transformer?

 

[romo84]

Hi,

Because I cannot find a 480 to 300V transformer. Also would I need a transformer for each phase?

 

[FOIWATER]

Yes you would need a transformer for each phase

If you stepped voltage down that way

 

[Bobbywhy]

Why not use VARIAC's products?

"Three phase Wye variable transformers:
240VAC 3 PH input, 0-280VAC output
240VAC 3 PH input, 0-560VAC output
480VAC 3 PH input, 0-560VAC output"

http://www.variac.com/staco_Variable_Transformer_Map.htm

 

[jim hardy]

How much current do you need?

Enough to run the motor, presumably tens of amps,
or just a few milliamps to fool some electronics into thinking power is pesent?

A good stereo audio amplifier IC and small 3 phase instrument transformer will do the latter.
Make two sinewaves 60 degrees apart and use them for open delta into step up transformer.