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3-Point Controller - how it works!
A Three-point controller is a discontinuously operating controller with three output states. How do so?
An example where a three-point controller can be used is a heating / cooling thermostat. Below the minimum temperature it switches on a heater, above the maximum temperature it activates a cooling unit. Within the range between minimum and maximum temperature both outputs are switched off.
![3-Point-Controller Appliance](https://sp-ao.shortpixel.ai/client/to_auto,q_glossy,ret_img,w_660,h_227/https://learnchannel-tv.com/wp-content/uploads/2019/09/3-Point-Controller-Appliance.gif)
3-Point-Controller Appliance
However, a three-point controller can also switch two-stage actuators. For example, gas or oil burners with two power levels, wherein when falling below the lower setpoint, the second stage is added.
![3-Point-Controller Appliance](https://sp-ao.shortpixel.ai/client/to_auto,q_glossy,ret_img,w_821,h_425/https://learnchannel-tv.com/wp-content/uploads/2019/09/3-Point-Controller-Appliance-1.gif)
3-Point-Controller Appliance