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Maintenance essential graphic explanation of the elevator electrical principle knowledge

Jul 19, 2018

Elevator door lock, overhaul, brake coil, running relay circuit


1, schematic

2, the principle description


    Door lock JMS:

    Door interlocking contacts are provided on each hall door and car door. Only when all the doors are closed, all the door electrical interlocking points are closed, and the door lock relay JMS is sucked in, and the elevator can operate.


    Overhaul JM:

    The maintenance switch is installed in the car and the car. When the maintenance switch is turned to the inspection position, the inspection relay JM is sucked and the elevator is in the inspection state.


    Brake coil: DZZ

    In the following four states, the brake coil is energized and the brake is open:

    (1) The express train goes up, that is, S↑, K↑.

    (2) The express train goes down, that is, X↑, K↑.

    (3) The slow train goes up, that is, S↑, M↑.

    (4) The slow train goes down, that is, X↑, M↑.


    When the elevator starts running, because 1A and 2A are still not sucking, their normally closed contacts short-circuit RZ1, so DZZ can get 110V DC voltage. After the elevator starts, after a period of delay, 1A pulls in, so that the resistor RZ1 is connected in series to DZZ. In the coil, the voltage across DZZ drops to about 70V, which is called the sustain voltage. The function of capacitor C8 is to have a transition process when DZZ drops from 110V to maintain voltage, preventing DZZ voltage transients and causing malfunction. The resistor RZ2 constitutes a discharge circuit of DZZ.


    In order to prevent the elevator from switching from the express K to the slow train M, the DZZ has a moment of power failure, so the JK delay relay is placed, thereby ensuring that the brake does not occur twice.


    Run relay JYT:

    When the elevator up contactor S or the down contactor X is engaged, the running relay JYT pulls in, indicating that the elevator is in operation.


    Acceleration and deceleration delay relay


    1, schematic

2, the principle description:


     When the driver presses the direction button to start closing the door, J1SA and 1JQ are used to make J1SA pull in. Then, the capacitor C1SA is charged through R1SA. When the elevator starts to run, JYT↓, J1SA is not released immediately, and C1SA discharges J1SA through R1SA. So that the J1SA is still sucking for a while, so the J1SA is a time-release relay. When the J1SA is released, the primary acceleration contactor 1A is sucked, and the elevator enters the steady-speed express state after the step-down start to the first-stage acceleration (see the running circuit).


     When the elevator is in the running state of the express train, J2SA, J3SA and J4SA are in the pull-in state. Once transferred to the local train, M↑→J2SA delay release→2A↑→J3SA delay release→3A↑→J4SA delay release→4A↑, Form 1st, 2nd, and 3rd stages of deceleration.


     When the express train goes to the local train, JK also delays the delay.


     Stop trigger and stop circuit


     1, schematic


2, the principle description


     If the elevator goes from the 1st floor to the 4th floor. J4J pulls in.

     The elevator travels upwards. When the magnet plate is inserted into the sensor on the 4th floor, the 4JZ pulls in, and the stop trigger relay JTQ is released.

     Through the J4J, 4JZ, JTQ delay disconnect contacts (1, 7), the stop relay JT is connected, and the elevator enters the deceleration stop.

     The delay time of the stop trigger relay JTQ is preferably less than 0.1 second. Its function is to ensure that the elevator does not respond to the parking command issued by the floor after it reaches a certain floor. For example, if you are in the elevator to the fourth floor, enter the 3rd floor command when passing the 3rd floor, the elevator will only remember the 3rd floor command, and will not answer the parking. If the delay time of JTQ is too long, it is possible to agree to this stop command, and the deceleration distance is not enough at this time, which will cause the phenomenon of punching.


     Running, decelerating, leveling

2, the principle description


    Express train up: JQ pull-in, make the quick contactor K pull-in, (loop 1) express delay relay JK pull-in, through the fixed direction JKS, make the upward running contactor S pull in, because 1A still does not suck Combined, so the elevator express deceleration starts, after a delay, 1A pulls in, the elevator accelerates, and finally reaches the fast running speed of the express train.


    Deceleration: When running to the destination layer, JQ is released, K is released, and M is pulled. After K is released, S continues to hold the suction through (loop 2) JK (3, 8)--S (1, 2)--X (3, 4), the elevator runs upwards in slow train, and passes 2A, 3A, 4A's step-by-step pull-in, three-stage deceleration braking, and finally enter the slow speed running.

When JK is released, S continues to self-protect by (loop 3) JM (13, 14) - JMQ (2, 8) - M (1, 2) - S (1, 2).


    Leveling: The elevator continues to move slowly. The upper level sensor is the first to insert the floor magnet plate. At this time, S can pass (loop 4) JPS (3, 8)--JQ (2, 8)--JPX (2. 8), K(3, 4)--JM (13, 14) pulls in, the elevator rises again until the door sensor is inserted, the circuit 3 is disconnected, S only pulls through the circuit 4, and the lower level sensor is inserted. When the elevator is just leveling, the circuit 4 is disconnected, the S is released, the M is released, and the elevator stops running.


Display loop

1, floor and direction display schematic

2, command and call signal display

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