Phase Rotation

[Lcdrwalker]

I always have the POCO set me up with a CW rotation. Its easier to keep track when hooking up mechanicals. My rotometer has three lights in a triangle. The lights flash appropriatly for CW or CCW rotation.

 

[LarryFine]

if it rotates too long in one direction, it'll get dizzy and lose it's balance.

"Must have balance, Daniel-san!"

 

[hillbilly1]

Yes, and it appears when it creates the new source, it does so in a clockwise fashion, regardless of the input's orientation..

I have noticed this with Freq drives also, regardless of input orientation, it always puts out clockwise, Don't know if this is true with all Freq drives, but all of the ones I've installed have done this, motor rotation has to be changed on the load side.

 

[Jraef]

Yes, that is true of all VFDs. Since they are re-creating the psuedo sine wave, the firing pattern of the transistors is set up to output A-B-C. But in software, you can invert that as well; the VFD really couldn't care less.

Again, that's only relevant when compared to the utility power, and even then, only if there is a bypass switch involved.

I don't think that UPSs give you that option of inverting the output though, at least I have never seen one that did. They technically could do it however since they use the same basic firing methods.

 

[480sparky]

"Must have balance, Daniel-san!"

:smile:​