Re: Sonderman Testing
---------- Forwarded message ----------
Date: Tue, 30 Sep 1997 12:33:22 -0400 (EDT)
Subject: Re: Sonderman Testing
In a message dated 97-09-30 00:25:36 EDT, you write:
Have noted some of your posts regarding cap damage & problems. I'm
beginning to suspect the culprit may be your welding xmfr reactor. We have
run 6 inch coils to over 11 ft. spark discharges with our reactors on pole
xmfrs and have not noticed any destructive effects. I suspect you are
hitting a nice power supply resonance point that is causing your pole xmfr
to rise above its normal ratings. The pole xmfr can take it but apparently
your caps can't.
Thanks for the input. If this is the case, shouldn't I be able to stop the
resonance problem by adding series resistance? I tried this last night,
varying it from 20 ohms to 3.3 ohms and still had the same problems. The
safety gap across the cap would fire at about 50% of full variac power.
Malcolm also suggested the pole pig ballast (welder) is causing a resonance
problem with the .025 mfd cap. How do I stop that?