It ensures that only one contactor is pulled in at any time to avoid short circuit of power supply. ![]() These two dynamic breaking contacts are called interlocking contacts, and this interlocking is called electrical interlocking. A dynamic break contact of km2 is connected in series in the KM1 coil circuit: similarly, a dynamic break contact of KM1 is connected in series in the km2 coil circuit. (Figure b) the principle is the same as figure a. if they are pulled in at the same time, the power supply is short circuited at the connection point of the contactor. Cause: the main circuit contactors KM1 and km2 are connected to the power supply of two phase sequences of motor M. Disadvantages: SB2 and Sb3 buttons cannot be pressed at the same time, otherwise the power supply will be short circuited and the motor will not work. Press SB1, km2 is powered off and released, and the motor stops. ![]() Press Sb3, km2 is powered on and engaged, and the motor starts and reverses. Press SB1, KM1 is powered off and released, and the motor stops. (figure a) press SB2, KM1 is powered on and engaged, and the motor starts to rotate forward. ![]() Its function is usually realized by integrated circuit, rather than an independent instrument.ġ、 Reversible control circuit of asynchronous motor Its main function is to generate driving rotation. Motor controller is a device used to control the operation of motor.
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