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Irrigation motor automatic protector circuit diagram 2

2016-09-04 21:02  
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Irrigation motor automatic protector circuit diagram 2
The irrigation motor automatic protector circuit is composed of the starter control circuit, phase failure protection circuit and test circuit, and the circuit is shown as the figure. Starting circuit is composed of the starter button S2 (S2a, S2b), AC contactor KM and relay K2 and so on. Phase failure protection circuit is composed of the indicators HL2 ~ HL4, photosensitive diode VD1, resistor R, transistor V, capacitor C, diode VD2, power transformer T and the relay K1. Test circuit consists of the test button Sl, light sensitive diode VD1 and indicator light HL1. R selects 1/4W metal film resistor or carbon film resistor. C uses the aluminium electrolytic capacitor with the voltage in 25V.