301140 | PILZ | Safety relay module

Description

301140 | PILZ | Safety relay module

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For the temperature control trigger circuit composed of IC2 and W2, W3, W4, and thermistor Rt, 301140, when the temperature rises, the resistance of Rt decreases, and the C-pole potential of BG2 correspondingly decreases. When it drops to a level lower than 1/3VDD on pin 2 of IC2, 555 is set, and the high level output from pin 3 causes relay J2 to be engaged, thereby connecting the voltage of the watering machine solenoid valve and watering and cooling the bean sprouts. Subsequently, as the temperature decreases, the resistance of Rt increases, and the C-pole potential of BG2 increases. When it reaches a level that makes the potential of pin 555 ⑥ higher than 2/3VDD, IC2 resets, and the low level output from pin ③ releases relay J2, causing the watering machine to stop watering. This cycle controls the temperature within an environment suitable for the growth of bean sprouts.

This controller can automatically water the bean sprouts using the hormone 301140 within 3 hours of the specified hormone concentration, and can automatically maintain the optimal temperature range for bean sprout growth.

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