PM200-13C VR2 question
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 |
PM200-13C VR2 question
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 -- Please remove one 'i' from my address when replying by email. |
PM200-13C VR2 question
On Aug 7, 5:16 pm, Franc Zabkar wrote:
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. Seehttp://www.rsg-electronic.de/de/produkte/files/pfc200.pdf Otherwise I'd do some quick circuit tracing. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. Good idea, I wouldn't have even thought of that. That'll also be easier than figuring out if it is for overcurrent, it's rated at 15v ~13A, I don't have any variable load in that range, probably just use a fet & op amp. If I get back to it soon I'll post my findings. Steve |
PM200-13C VR2 question
On Aug 7, 5:54 pm, sck0006 wrote:
On Aug 7, 5:16 pm, Franc Zabkar wrote: 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. Seehttp://www.rsg-electronic.de/de/produkte/files/pfc200.pdf Otherwise I'd do some quick circuit tracing. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. Good idea, I wouldn't have even thought of that. That'll also be easier than figuring out if it is for overcurrent, it's rated at 15v ~13A, I don't have any variable load in that range, probably just use a fet & op amp. If I get back to it soon I'll post my findings. Steve You were right, it adjusts the level at which the PFD pin goes low. Thanks for the help, I would've been hunting for ages. Thanks, Steve |
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