[Skiroy]

Okay guys I have a fan which is rated at 200V, but it is running on 120V. Here are the specs

4715MS-20T-B50 - AC Axial Fans - NMB Technologies Corporation

Now I need to buy a replacement. But which do I get a 115V or the 230V version on this page?

McMaster-Carr

It is the 119mm 106cfm one. My question is, is there any issue with running a fan rated at 200V on 115V, or running a 230V fan on 115V? I thought that would bog down the fan and cause it to run slow and hot and have a short life?

[underthetire]

Maybe that's why your changing it. Get the proper one, when those fans fail they turn in to little heaters.

[Skiroy]

Maybe that's why your changing it. Get the proper one, when those fans fail they turn in to little heaters.

Thats why I am asking to figure out which is the right one?:drowning:

[Al_The_Man]

If it is running on 120v get a 120v version.
Al.

[Skiroy]

If it is running on 120v get a 120v version.
Al.

Well actually I read the voltage wrong. I had the meter on 200V but becuase it was slightly higher than 200V I wasnt getting anything.DUH!.

But for some reason when I put the positive lead on one of the fan terminals and the meters negative to the earth ground bonding terminal of the machine I got 120V.

Now the Fan says its 200V single phase but why was I getting 120V reading? Is it because I am testing one of the 2 120V wires that add to 200V? I know the machines main supply comes in 3 phase.


ALSO MORE IMPORTANT THAN MY ABOVE RAMBLING. I now know that the fans supply voltage is 200V. So is this fan rated at 230V okay?


McMaster-Carr

[Al_The_Man]

Yes then use the 230v model, it sounds like either the fan is fed off of 240v supply with a centre tap ground transformer the same as the domestic supply, or it is fed off of 2 phases (1ph) of a 3ph transformer that has a grounded star connection, but I would guess the former.
Al.