When I first used these in a medium powered broadcast TX design, I used them
for everything except the plate contactor and step start relays. Had a lot of
problems with the ones on the filament and blower AC lines, as they would
occasionally turn-on or -off on line transients when the main plate contactor
switched. We solved this transient susceptability problem by installing RC
snubbers and MOV's across the line terminals, not the control terminals. I saw
this series RC snubber approach in one of the old SSR app. manuals, might have
been International Rectifiers notes. It was there to prevent dV/dt on the line
from causing falsing. We used the snubbers on them for years, in production
units. I would imagine that these days, the SSRs are improved in their immunity
to line noise.
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|