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What is the role of the self-locking and interlocking of the relay in the secondary circuit?
May 06, 2018

The function of the self-locking is to keep the relay's (self) pull-in, so that the relay can keep the pull-in state after the relay's pull-in signal disappears; the interlock is to prevent the circuit from generating an error signal due to the action of the relay (due to fault or error) or A short circuit occurred in the circuit. (The motor controlled by the contactor is used to change the direction of the motor by commutation, or the contactor that rotates the motor is not tripped, and the reversed contactor operates to turn on the power of different phase sequence, then the power supply To prevent this kind of accident from happening, the reversing contactor must be interlocked, and the contactor that reverses the motor must be tripped to confirm that the reversing contactor can be closed. The same effect.)