Connect with us

Problem with ORIEL Xenon Lamp power supply

Discussion in 'Power Electronics' started by frusciante89, Feb 15, 2018.

Scroll to continue with content
  1. frusciante89

    frusciante89

    3
    1
    Feb 15, 2018
    Hi everyone!
    I'm using a power supply (mod. Oriel 68907) in my lab to power a 500W Xenon lamp for a solar simulator, but the power supply wasn't turning on yesterday (display off, fan off, etc.). I asked the manufacturer but since this is an old part (1999), they don't have support available and even not a schematic. What I was able to obtain was the pcb traces and the components mask (although the right part of the board is different since it appears to be a different board revision). I tried to match the info I have the best I could with Inkscape in order to try debugging this thing.
    What I noticed is that there are 4 test points on top of this board, and only T1 reads what's expected, 12V. T2, T3, T4 all read zero (they are highlighted in blue in the attached picture to this thread).
    Also, if I excite the VN10KLS transistor in the green circle (i.e. I check the continuity between ground and gate, thus supplying a small current input to the transistor), then the fan starts and the display switches on, and everything seems to work fine. When I remove the probe, everything blacks out again.
    Do you have any idea of what could be wrong and what steps could I take to debug this?
    I'm attaching the partial schematic I was able to obtain and the voltage measurements I took with respect to ground. The wall input comes, after the ON/OFF equipment switch, from the molex in the bottom left of the scheme

    [​IMG]
    [​IMG]
    [​IMG]
     
  2. kellys_eye

    kellys_eye

    4,276
    1,146
    Jun 25, 2010
    The FET is switched via the opto-isolator which itself is activated by K1 (relay) which is activated by........
     
  3. frusciante89

    frusciante89

    3
    1
    Feb 15, 2018
    Here are more complete schematic[​IMG]
     
    Last edited: Feb 15, 2018
  4. frusciante89

    frusciante89

    3
    1
    Feb 15, 2018
    Guys, I solved the problem. Turns out that the lamp housing has a protection plate that functions as an interlock. Surprisingly, if you remove that plate, the controller doesn't turn on, not even the fan or the display. That was quite a surprise after two days of troubleshooting...
     
    Tha fios agaibh likes this.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-