mjrx

Question on PowerFlex4 Drives

3 posts in this topic

Can anyone tell me if a 480V PowerFlex VFD will at least powerup on single phase 480V? I need to make sure the VFD's at least light up in a panel full of drives, there is no 3 phase available but I can feed them with a 120 - 480 single phase xformer, so L1 & L2 will have 480 to them. No loads are hooked up, so theres no danger of that. Just trying to see if the drives power up right now.

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It has been some years since I put single phase on a three phase drive but the older Yaskawa, Toshiba, TB Woods and some AB drives would run a load just fine if Single Phase was on Phases A & C, leaving the B Open.  The only issue was you needed to derate the unit.  If you put 480 on L1/L3 you'll either get a missing phase error or a testable drive.

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Thanks. I didn't need to run loads, just needed to make sure the drives came to life. Just a temporary test on a panel that hasn't been used in some time, and it's offline in storage with only 240 single phase in house (I had a 480/240 transformer to convert to 480). Yes, I found they power up on single phase across L1 & L2. I have used Mits a lot and they work like this too. 

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