3 Phase Variable Power Supply

  • Thread starter romo84
  • Start date
  • #1
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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,
 

Answers and Replies

  • #2
1,097
3
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?
 
  • #3
8
0
Hi,

Because I cannot find a 480 to 300V transformer. Also would I need a transformer for each phase?
 
  • #4
FOIWATER
Gold Member
434
12
Yes you would need a transformer for each phase

If you stepped voltage down that way
 
  • #6
jim hardy
Science Advisor
Gold Member
Dearly Missed
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4,888
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.
 

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