Posted by John T on June 17, 2014 at 15:10:51 from (216.249.72.121):
In Reply to: RE: 3 phase question posted by the mick on June 17, 2014 at 13:01:24:
Thanks for the feedback and new info, that helps us help you. The answers previously given were based on the info we had then and the guesses we had to make not being there.
"It's TRULY a 3 phase system, I know for a FACT! I'm trying to wire a 3 phase a/c unit to one of the COMMERCIAL buildings I own."
NOT a problem, as a few of us said before, if you have a 3 phase panel, all it takes is a 3 pole circuit breaker to supply the 240 Volt Three Phase Power.
"The hvac guy is telling me the unit is showing out of phase, so we switched legs as was told by a tech. Didn't help"
If its out of phase and therefore say a motor is turning in the wrong direction, if you reverse any two of the legs it reverses direction and gets it back in phase. If it didnt cure out of phase I have no answer for you as every 3 phase motor I ever saw reversed if any two legs were swapped.
"So I was wondering if the high leg had something to do with the problem."
NOPE its 240 volt three phase on the three corners of the Delta and the fact one of the transformers is center tapped (to get 120) doesnt change that BEING A HIGH LEG SYSTEM ISNT THE PROBLEM as far as 240 volt three phase is concerned.
"I got the 203/230 numbers off the a/c unit"
Previously we weren't told that. What that new info tells me is the unit is designed such that it can operate and tolerate in the voltage range from 208 to 230. Not alllllllll motors are labeled or designed as such. Some are 208 some are 240 while yours appears can work on either. Also a 208 volt Y system IS NOT the same as the 240 volt Delta system.
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