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ArcticMyst Security by Avery

Power transformer from UPS: Powerware 5115 750VA 500W 120V

Joined
Nov 2, 2012
Messages
626
Points
43
I pulled this UPS (Powerware 5115 750VA 500W 120V) from the junk bin at the local university and figured it would have some nice things in it. I took it apart and found out why they got rid of it. Looks like vapors from the battery corroded the heatsink and leads of one of the switching transistors, which shorted and burned out. Everything else looks fine. Came with a pair of sealed lead-acid batteries too.

Among other things, I removed a large power transformer, but it only has three wires (brown, red, orange) coming out of it. I think it must be an autotransformer because all the leads have continuity with each other. Can't seem to find a datasheet for it, but it's made by Leader Electronics Inc. (LEI) in Taiwan. Lots of similar-looking units on eBay but not this exact model. It has numbers printed on it:

080-00714-01
CLASS B(130°C) Z150H
LEI-4 E154515 0149

The E154515 is a UL file number (PDF here). The second line is apparently the insulation temperature class. I have no idea what the rest of it is.

I checked the winding resistance with my DMM. Both brown-to-red and brown-to-orange are 2.3Ω. Red-to-orange is <0.3Ω.

Any ideas on how to hook this up and test it? Initially, I plan on testing it with 3 volts AC by way of a variac and 24-volt isolating transformer. I assume it was designed for mains but one can never be too sure. I'm a bit confused because it only has the 3 wires, but I think the setup will be similar to hooking up a variac.
 





Joined
Sep 12, 2007
Messages
9,399
Points
113
I'd hook up a variac to brown+red. Turn it up slowly, monitor input current, and monitor voltge on red+orange. Do the same with the variac on brown+orange; that should give you a slightly different voltage on red+orange. I don't think 24V isolation is necessary for testing.
 




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