Greenhouse fan simple control circuit

Circuit working principle: In this circuit, the greenhouse fan ETXS series is widely used in greenhouse
flowers, industrial plants, livestock and poultry houses and other places. It is a high-performance motor. The fan can clean the surface by itself when
running It has push-pull shutters and can operate all day long. ,
stable performance.
    When working, first connect the electrical contact thermometer P. Adjust to the high temperature exhaust air setting value, such
as 28℃, close switch SB. When the greenhouse temperature reaches above 28℃, the electrical contact thermometer
will turn off. The upper contact point is connected to the mercury column, P. is turned on, the AC input control end of the solid state relay SSR
receives the AC 220 V input power and is turned on, causing its AC output
controlled end to be turned on, the fan M starts to operate, and begins to exhaust air and cool down; when the indoor temperature drops to
28°C When the following conditions occur, P1 is open circuit, solid state relay SSR loses control power and is blocked, and
fan M stops running. Repeating this process over and over again, the temperature in the greenhouse is kept below 28°C
, so that the production and working environment is well protected.