I have never had an RS (linear) Astron power supply go into crowbar
mode, but I can see why a healthy spike could cause that to happen. I
have RS-7, RS-12, RS-20, and RS-35 units that have been working fine for
many years, although all of my new units are SS (switching) supplies.
The RS-35M has a typical crowbar circuit, which comprises an SCR across
the output, and a simple trigger circuit. The gate of the SCR has a 0.1
uF capacitor, C102, to bypass spikes and prevent (?) false operation.
My gut feeling is that this capacitor should be much larger to do its
job reliably; I would replace it with a 2.2 uF tantalum capacitor in
parallel with a 510 pF silver-mica capacitor.
Let's not lose sight of the fact that the motor circuits that are
generating the spikes should be examined for ways to reduce or eliminate
same. Moreover, tinkering with the power supply crowbar circuits is
really treating the symptom rather than the problem.
73, Eric Lemmon WB6FLY
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