Hello, Wondering if someone can offer me some guideance on a exhibit that I have created. I am using an Arduino Uno to intermittently turn on and off a high power industrial fan. The fan draws about 12-13 amps when on. I am using a solid state relay to control the fan. The exhibit is a high traffic area and is activated several hundred times per day. This is the relay I am using:
The problem that I am having is that after about 3 to 5 days of use, the AC side of the relay seems to get stuck on the "on" or permanently closed state regardless of the state on the input (arduino 5v) side, so the fan just runs constantly without any control from the Arduino. The SSR is properly heat sinked and actually barely even gets warm when the relay is operating normally.
I am just starting out in electronics. My suspicion is that this has something to do with the high current inductive load on the relay. I have tried to do my research here and in other places and I keep seeing reference to a RC snubber but I am not clear on how to, or if it is actually needed. Maybe I'm totally off on what the problem actually is to begin with. I have gone through 3 relays so far, so it seems to be pretty clear that there is a repeatable problem with my design.
Any assistance would be greatly appreciated. Thanks!