Common Protection Measures in Motor Control Circuit

When the motor works, circuit faults will be caused due to overload, low power supply voltage, sudden power failure, short circuit of motor winding and other reasons, so that the motor can not work normally, and even burn the motor. Therefore, the necessary protection measures in the control circuit are essential. The common protection measures include short-circuit protection, overload protection, voltage loss and undervoltage protection.

1、 Short circuit protection

When a short circuit fault occurs during the operation of the motor or a short circuit occurs in the line connecting the motor, fu1 will fuse quickly (or the automatic air circuit breaker will trip quickly) to disconnect the motor from the power supply and play the role of short circuit protection.

When a short-circuit fault occurs in the control circuit, fu2 is blown to power off the KM coil, the KM main contact is disconnected, and the motor is powered off and shut down to play the role of short-circuit protection.

2、 Undervoltage protection

"Undervoltage" means that the line supply voltage is lower than 85% of the rated voltage of the motor.

Undervoltage protection refers to the protection that the motor can automatically disconnect from the power supply and stop running, so as to avoid the operation of the motor under undervoltage. When the applied voltage is too low, under the action of the reaction spring, the armature of the AC contactor is released, the main contact is disconnected, at the same time, the dynamic closing contact (self-locking contact) in its auxiliary contact is disconnected, and the motor is separated from the power supply to play the role of undervoltage protection.

3、 Voltage loss protection

Loss of voltage (zero voltage) protection means that the motor can automatically cut off the power supply when it is suddenly powered off due to some external reason under normal working conditions; When the power is re supplied, the motor will not start by itself. This avoids the accident that the operator forgets to cut off the power supply after a sudden power failure, and the motor starts automatically after the power supply, resulting in equipment damage or personal casualties.

4、 Overload protection

Overload protection is a kind of protection that can automatically cut off the motor power supply and stop the motor when the motor is overloaded. The most commonly used overload protection is realized by thermal relay.

When the motor is overloaded → thermal relay fr acts → causes its dynamic breaking contact to disconnect → km coil loses power - → → km main contact is disconnected → motor M stops. → at the same time, the KM self-locking contact is disconnected to release the self-locking.

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