Hoist Data

[Alwayslearningelec]

Don't have hoist data sheet but I'm going to feed it with 200A at 480v. Have a 120/277v source so will need step up xfmr.

Seems pretty obvious but looks like need 225kva xfrm to deliver proper power to hoist, correct?

 

[infinity]

I think that your power source is 208Y/120 not 120/277?

 

[don_resqcapt19]

That data sheet is for a step down transformer, and while you can reverse wire it, it would be better if you get a step up transformer. If you use the one on the sheet, you will have to run the 480 volt secondary as a ungrounded system requiring ground detectors or as a corner grounded system.

 

[infinity]

As Don stated you're better off using the correct Delta/Wye step up transformer. I believe that some of these hoists have a VFD which may not like the corner grounded system.

 

[Alwayslearningelec]

Thanks...geez my brain hurts. Corner grounded, delta/wye!!

 

[augie47]

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Thanks...geez my brain hurts. Corner grounded, delta/wye!!

A transformer with a delta secondary would either be ungrounded ( requiring ground detectors) or corner grounded (drives often aren't comparable with either) whereas a wye secondary (470Y/277) avoids those problems. If you have a 208 primary you are normally better off with a step-up delta, wye transformer

 

[infinity]

Thanks...geez my brain hurts. Corner grounded, delta/wye!!

As stated keep it simple, just buy the correct step up transformer, Delta/Wye 208-480Y/277.

 

[hillbilly1]

As stated keep it simple, just buy the correct step up transformer, Delta/Wye 208-480Y/277.

And they are relatively easy to get.

 

[Alwayslearningelec]

 

[Alwayslearningelec]

These vids helped

 

[augie47]

 

[Alwayslearningelec]

This guys explains it very well IMO