What relay is needed to operate the compressor control circuit?
Task: there are two relays that can be configured for pressure from 1 to 10 atm, one normally open, the other normally closed, installed on the receiver. It is necessary to make the compressor pump 6 atm at 12 volts and turn off, when air consumption reaches 2 atm, the compressor turns on again and so on. Which relay is suitable for this circuit? And on my fingers, how to put it all together, I’m a mining engineer, but unfortunately, not an electrician.
If the relay is with hysteresis, then it will turn on and off when the set pressure is reached, and the pressure difference between switching on and off will be determined by the design of the relay itself, that is, the width of this hysteresis itself, for example 10 and 6 atm ... This width can in some cases be regulated by two springs .
In this case, you need to use a normally-closed relay, that is, its contacts are in a closed state until the desired pressure is accumulated, and they will close again when it drops below the hysteresis. I hope I clearly explained. Normally-closed contacts are included in the gap of one of the supply wires.
I don’t know what specific relay you have, which’s why I give such a vague answer. I note that there are many different relays for 12V compressors, and many of them with hysteresis, with and without the possibility of tuning, i.e. they are set from the factory in such a way that they turn on at some discharge to some minimum and turn off when pumped to some maximum pressure. It turns out that without pressure, such relays are turned on, i.e. their contacts are normally closed.
A relay with normally open contacts will turn on when there is pressure, which does not match your idea. It turns out that without pressure, its contacts are open, i.e. the compressor will not turn on ... It can be used for any alarms, for example, "pressure is normal."
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