Press the abort button SB1, the contactor KM coil is de-energized, and the auxiliary normally open contact of the KM connected in parallel with SB2 is disconnected to ensure that the KM coil continues to lose power after the button SB1 is released, and the main contact of the KM connected in series in the motor circuit is continuously disconnected and the motor stops. This effect of the NOH contact of the KM connected in parallel with SB2 is called self-locking. The control circuitry can also enable short-circuit maintenance, overload maintenance, and zero-voltage maintenance.
The short-circuit maintenance is the fuse FU that is connected in series in the main circuit. Once the circuit is short-circuited, the melt will blow immediately and the motor will stop immediately.
It is the thermal relay FR that takes up overload maintenance. When overloaded, the heating element of the thermal relay heats up, and its normally closed contact is disconnected, so that the contactor KM coil is de-energized, and the main contact of KM connected in series in the motor circuit is disconnected, and the motor stops. The KM auxiliary contacts are also disconnected and the self-locking is released. If you want to start again after the fault is removed, you need to press the reset button of the FR to reset (close) the normally closed contact of the FR.
It is the contactor KM itself that is maintained at zero (or undervoltage). When the power supply is temporarily cut off or the voltage drops severely, the electromagnetic attraction of the contactor KM coil is lacking, and the armature is released by itself, so that the main and auxiliary contacts are reset by themselves, the power supply is blocked, the motor stops, and the self-lock is released together.
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