I might be off the wall here, maybe somebody could double check me... Don't go taking this advice unless somebody double checks me... A compressor that small will most likely run the motor directly through the pressure switch, either switching both lines, or switching the hot, with the two presser switch terminal sets paralled to share the load. I think if you stuck a magnetic starter on the compressor, you could wire that up as you would for any motor, but feed the magnetic switch with the power currently exiting from your existing pressure switch (currently being sent to the motor). Send that switched power to the contactor, and then from the contactor straight to the motor.
The start button would start the motor (provided the tank is low, otherwise no need to start the motor), and when the pressure switch opens (tank full), it'll be an effective power outage, the starter will drop out and default to the failsafe positon, which is the off position.Until the tank is low and you hit the button again.
The override switch "should" be easy, if you're building a full on custom control. This way omits it, but it uses off the shelf, tried and true parts, exactly in the way they were meant to be used. An unconventional order, but the actual working in side the switches remains as designed. Other than that, it's really no different than what you're trying to do. I guess I just prefer components that are made for the exact job that they're doing, (evven if it's not the intended application), versus designing from scratch and iterating universal parts until it works. Latching relays do work though if you've got the right ones... It's certainly been done, and is fine. I'm not knocking that.
Food for thought I guess, until somebody more familiar can give that a thumbs up or thumbs down...
In the mean time... How much harder is it to patch up a couple of air leaks than it is to completely reengineer a new electromechanical control system for a semi-automaticly operating machine? Feel free to -not- answer that question, because I'll tell you right now that I'm not going to tell you how long it takes my air compressor to wake me up in the middle of the night if I forget to switch it off.
The start button would start the motor (provided the tank is low, otherwise no need to start the motor), and when the pressure switch opens (tank full), it'll be an effective power outage, the starter will drop out and default to the failsafe positon, which is the off position.Until the tank is low and you hit the button again.
The override switch "should" be easy, if you're building a full on custom control. This way omits it, but it uses off the shelf, tried and true parts, exactly in the way they were meant to be used. An unconventional order, but the actual working in side the switches remains as designed. Other than that, it's really no different than what you're trying to do. I guess I just prefer components that are made for the exact job that they're doing, (evven if it's not the intended application), versus designing from scratch and iterating universal parts until it works. Latching relays do work though if you've got the right ones... It's certainly been done, and is fine. I'm not knocking that.
Food for thought I guess, until somebody more familiar can give that a thumbs up or thumbs down...
In the mean time... How much harder is it to patch up a couple of air leaks than it is to completely reengineer a new electromechanical control system for a semi-automaticly operating machine? Feel free to -not- answer that question, because I'll tell you right now that I'm not going to tell you how long it takes my air compressor to wake me up in the middle of the night if I forget to switch it off.
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