On Tue, 5 Aug 2008 16:58:50 -0700 (PDT), sck0006
put finger to keyboard and composed:

I just bought a PM200-13C & was adjusting the output voltage. In a
careless fashion, I turned the one pot I saw without marking it,
hoping that the lacquer would break so I could see where the pot was
originally set. Unfortunately, the lacquer broke off the pot
completely & the output voltage stayed put. I then saw the pot behind
it, which adjusts the output quite nicely. Now I want to set the
first pot back, but can't figure out what its function is. I figured
it might be the overvoltage protection, but the ps trips out at 19.2V
regardless of pot setting. Over current maybe? Any ideas?
Datasheet for ps is he
http://www.mpja.com/download/17103ps.pdf

I know I was being careless, please don't grill me, I'm just looking
for a little help.

Thanks,
Steve

Other than overcurrent, perhaps the PSU can sense an AC Power Fail
condition, eg a brown out. Years ago I worked on minicomputer grade
switchmode PSUs that had adjustable AC power fail detection. I notice
that connector P3 has a "PFD" pin (PFD = Power Fail Detection). I'd
monitor that pin while tweaking the pot.

See http://www.rsg-electronic.de/de/prod...les/pfc200.pdf

Otherwise I'd do some quick circuit tracing.

- Franc Zabkar
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