When we finally get the "event triggering" base 3 firmware out, this would be in the realm of what is possible. But, that's still 6ish months out with the possibility of schedule slippage.
Personally, what I currently use for this type of thing is a click plc from automation direct. The base units can be bought with various types of i/o, and then if needed you can add on other modules. If your temperature sensor is on/off you probably just need standard "digital" i/o built into the controller unit. The controller will also handle modbus sensors. But, if you want to use a thermocouple or rtc temperature sensor, you'd need an add on module. But, I also agree with others that fixing the fan motor might be easier/quicker/less expensive. On Wed, Jan 1, 2025, 10:54 AM Nate Burke <n...@blastcomm.com> wrote: > I'm running an application with an industrial heater, basically you > apply 120V to the unit, it blows hot air. I've built a 24VAC relay > controlled by a smart thermostat so that the thermostat powers on and > off the unit. > > The Issue I have is that I think there's a dead spot on the blower motor > of the heater, so about 1/20 times, the heater won't start when 120v is > applied. If the power is cycled on and off a few times, then the motor > will start. The unit is smart enough that it won't start the heat if > the fan isn't running, but the thermostat isn't smart enough to know > that it's not actually heating and cycle it. > > I can tell when the unit isn't running because I have a temperature > probe on the output air of the unit, and when it drops below ambient > temperature, I know that the Louvers drawing outside air are open, but > there is no heat being produced. Then I can Manually go in and cycle > the thermostat on and off a few times, and the unit will start working. > > I'm trying to figure out a way to automatically cycle the unit if a > temperature reading is below a set point. It would need to be something > programmatic, like > > IF Temperature is Below SETPOINT for longer than 4 minutes, THEN CYCLE > power for 5 seconds, REPEAT. > > The blower motor does draw about 1600W, so a 120v relay needs to be at > least a 20A relay, a low voltage switch interrupting the 24VAC would be > easier. > > I was wondering if something like this already existed. I could > read/switch based on temperature from a packet flux, but I don't think I > can do the timings without external scripts. Would this be simple with > an Arduino? I've never used one before. > > I hope the collective might point me in the right direction to start > looking. > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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