Buck/boost transformer

[Alelectric04]

Hey guys. Have a buck boost transformer setup I’m trying to install. Primary voltage is 208v 3phase. Needs to be 230v to feed a metal break. Using two bb transformers. I can not get them to produce 23x V. Either it is 24x V phase to phase or 212v phase to ground. Does anyone have any insight on how to wire these up. I don’t have much experience with bb transformers. The acme T113074. Pictured below is how I have it currently wired with 240v ish on the secondary.

 

[LarryFine]

 

[LarryFine]

First, most 230v equipment is intended to run on a 240v supply. If you feel the voltage you're getting is too high, connect the secondaries in parallel: X1 + X3, X2 + X4.

Remember you're supplying the series'ed primaries with 208v, so the secondaries will put out 20.8v in series, or 10.4v in parallel. Add 20.8 to 208 and you get 228.8v.

That's not always close enough to 240v, so they make BB transformers with 16v secondaries, which can get you closer. With about 28v added to 208v, you get 236v.

 

[LarryFine]

With 16/32v secondaries:

 

[BarryO]

First, most 230v equipment is intended to run on a 240v supply.

First some reason, magnetic brakes seem to have tight voltage requirements; e.g., the Baileigh brakes require 220VAC +/-5% or the warranty is voided.

 

[ptonsparky]

The measured incoming voltage was probably in range. Did you check it?

 

[ptonsparky]

Ignore your phase to ground.