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Multifunctional Motor Protector (2)

2016-09-01 11:50  
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Multifunctional Motor Protector (2)
When the motor is working well, TA's induced voltage is low, IC's 6 pin's voltage is lower than 2Vcc/3, 3 pin outputs low level. K is not connected. When L2 or L1 lacks phase, L3's phase current will be larger. TA's induced voltage will be lager. IC's 6 pin's voltage is higher than 2Vcc/3. 3 pin will have low level. KM is released and M stops working. When the motor is overload, L1-L3 will have larger current. When the current reaches 1.2 times rated current, IC's 6 pin will have a voltage higher than 2Vcc/3. M will stop working.