Water pump motor protection circuit
Source: InternetPublisher:MartinFowler Keywords: Protection circuit motor protection trigger AC contactor Updated: 2021/09/25
Working principle of the circuit: The 380 V AC power supply outputs 9 V DC voltage after being stepped down and rectified by the transformer.
When the water pump is required to work, you can press the button S, the switch circuit
TWH8778 is triggered and turned on, and the photoelectric coupler provides triggering to the bidirectional thyristor. signal
, the thyristor 3CT is turned on, the AC contactor works, its contacts are closed, the motor
power is turned on, and the water pump pumps water outward. After the water pump pumps water, short-circuit A and S with water, and
TWH8778 protects the conduction. At this time, release S and the water pump will still work normally.
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