On/off control causes the process to exceed or fall below the set point limits continually, resulting in poor. When the measured variable is below the set point, the controller is on and the output signal has maximum value This approach involves toggling a system between two states—on and off—to maintain desired operating.
On Off Control Controller: What is it? (Working Principle) | Electrical4U
Interface the thermostat logic to a transistor driver (2n3904 hfe = 300) that will actuate a furnace control relay
The relay has a dc resistance of 250 ohms.
The controller output is either fully on or fully off, based on the comparison between a measured process variable and a desired setpoint.
