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Had an opportunity today to dissect the failed relay on the low pressure side of my system.
Clearly there had been arcing between the load terminals and the contactor bar but more interestingly,
the plastic which surrounds the magnet had begun to melt and crack. This prevented the contactor bar shaft from sliding
freely when the magnet was energized.....
So, at the risk of displaying my normal electrical ignorance, which diagram below best represents
the intermittent relays in our 320/360s? My relays are grounded at the case and have two small terminals
on the side marked "I" and "S". Voltage applied to the "S" terminal will energize the relay.
In this illustration from the Perhgelion Design website, it looks like the 2nd diagram from the left best represents what we
have. So placing a Bi-directional Zenner diode between the "S" terminal and the case ground is all that's needed
to protect the relay control circuit, right?? But what about the fat contactor load terminals and the bar inside the relay, how can or should they be protected as well? Does it make sense to place a Bi-directional Zenner diode across these terminals as well?
See, your suspicion that I don't have EE after my name is confirmed!
Angier Ames
N4ZQ
22hrs
Zener.jpg
zener-1.jpg
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