PFSA103D 3BSE002492R0001 Intermediate Relay

PFSA103D 3BSE002492R0001 Intermediate Relay

PFSA103D 3BSE002492R0001 control circuit contains three contactors and one intermediate relay coil with 12 contacts. When starting, KM2 and KM3 coils are in the disconnected state, press the start button SB1, KM1 coil is energized and self-locking, and the motor starts with series resistance and voltage reduction. When the motor speed rises to a certain value (this value is the setting value of the speed relay KS1, adjustable, such as to 100r/min action), the normally open contact of the speed relay KS1 is closed and the intermediate relay KA is energized and self-locking, the normally open contact of KA is connected to the contactor coil KM3, the main contact of KM3 is shorted to the stator resistor R in the main circuit, and the motor speed rises to the given value. The motor speed rises to the given value when it is put into stable operation.

PFSA103D 3BSE002492R0001 When braking, press the stop button SB2, the coil of KM1 is de-energized, and its main contact disconnects the three-phase power supply; the normally-open contact in the control circuit is open, KM3 is de-energized, and the current-limiting resistor is strung in; the normally-closed contact is closed, and it connects with the reversing braking contactor KM2, and adjusts the two-phase power supply phase sequences, and the motor is in the reversing braking state. When the rotational speed drops to a certain value (for example, 100r/min), KS1 normally open contact breaks KA, followed by disconnecting KM2, the motor is de-energized and stops quickly.

PFSA103D 3BSE002492R0001 control mode control logic is clear, the use of electromechanical combination is convenient for ordinary mechanical or electrical technicians to maintain, but due to the use of electrical components of large size, contacts, failure rate, therefore, the operation of the lower reliability. With the development of PLC technology, the use of PLC for motor operation control has become an inevitable trend.