TrippLite power supplies are well made, high quality supplies, but that negative lead regulation is a little odd and difficult to wrap your head around when it comes time to repair them. This supply to me inoperative, so I had to dig in deep to see what was wrong.
First: TrippLite keeps the schematics for these close to their chest, so it
took a bit of searching online to locate someone with an electrical
schematic. FYI, there's a great site on yahoogroups for power supplies, you should join it if you think you'll ever need a schematic or info on a power supply. The link to it is:
https://groups.yahoo.com/neo/groups/powersupplies/
I also uploaded a copy of the schematic in the [Schematics & Manuals] section of my website at:
http://www.WB4IUY.net
I discovered the remaining insulators on the output terminals had failed, and the rest were totally missing, shorting the output/crowbar board to the chassis. This took out all of the pass transistors and a few other bits. I replaced the pass transistors, fabricated new feed-thru insulators to protect the output studs from shorting to the case again, and rebuilt the crowbar circuit. Now, it'll go from no load to 40 amps @ 13.8 VDC with only 0.2 VDC shift. Solid supply!
New insulators fabricated...the outside insulator is T-shaped and passes through the chassis, the inner parts are counter bored so they fit together.
Dave WB4IUY
http://www.WB4IUY.net
