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Bad tracking on bench power supply

Discussion in 'Troubleshooting and Repair' started by jxlbbb, Oct 12, 2014.

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  1. jxlbbb

    jxlbbb

    3
    0
    Nov 30, 2013
    Dear all,

    I get hold on a 30 V 3A dual bench power supply Selectronic SL-1731SB, which seems to be the same
    as the Velleman PS23023, and may some other ones.

    Both canals are OK, but when I coupled them in series, the coupling is totally wrong

    example
    Tracking not activated : A : 5.4 V B: 10.3 V
    Tracking activated : A :25 V B : 10.3 V

    While one would expect to see both channels at 10.3V

    I could find a schematic of the PS23023 on the web
    https://www.velleman.eu/downloads/2/ps23023gbnlfresd.pdf

    But I cannot locate the place I should look for some faulty component.
    In the power supply, apart from the display section,
    there are two same boards for each channel, an additional board for
    the 5V channel, and a small board with lots of diodes that
    I do not identify the role.

    Can anybody help me, by telling me where to search for
    the faulty tracking behavior ?

    Thanks

    jxlbbb
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,477
    2,820
    Jan 21, 2010
    Can you confirm that the voltage regulation is working correctly on both channels when tracking is not enabled (is it stable under load)?

    What happens to the stability of the two channels when tracking is enabled?

    The first thing I'd look at is the tracking switch. Are the contacts dirty?
     
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