The motor protector plays a protective role in the event of overload, stalled, phase disconnection and three-phase unbalance failure of the motor.
Manual push-button controlled motor protector application circuitryWhen starting, press the start button SB2 (3-5) to AC contact.
The KM coil is energically engaged and the KM auxiliary normally open contact (3-5) is closed and self-locking, and the KM three-phase main contact is closed, and the motor is closed.
At this time, the motor protector is put into the circuit for operation;
At the same time, the KM auxiliary normally closed contact (1-7) is disconnected, and the indicator light HL is off, and the KM auxiliary normally open contact (1-9) is closed and indicated.
The light HL2 is on, indicating that the motor has started running.
When the motor is overloaded, stalled, out of phase or three-phase unbalanced during operation, the motor protector.
The inner relay acts, and its internal normally closed contact is disconnected, cutting off the AC contactor km coil circuit power supply, km line.
The ring is discharged when the power is off, the KM three-phase main contact is disconnected, and the motor stops running when the power is lost.
At the same time, the KM auxiliary normally open contact (1-9) is disconnected, the indicator light HL2 is off, and the KM auxiliary normally closed contact (1-7) is closed and indicated.
The light HL1 is on, indicating that the motor has stopped running.
In the circuit, HL is the motor stop and power indicator, and HL2 is the motor operation indicator.