How to connect the coil in and out of the AC contactor in the forward and reverse circuit of the thr

The forward and reverse operation of the motor is obtained by changing the phase sequence in the alternating operation of two AC contactors.

The coil of the AC contactor, also known as the control coil, the coil voltage is: 12V, 36V, 220V, 380V, etc., generally in the use of the forward and reverse rotation of the motor, the primary line circuit voltage will be borrowed, that is, the voltage of 380V.

The closure and clutch of the AC contactor coil is the key to control the working state of the main line circuit, so if two AC contactor coils are closed at the same time in the forward and reverse circuit, a short circuit state will occur, causing a failure.

The incoming wire of AC contactor coil A needs to be connected to the normally closed output contact of AC contactor B coil, and the incoming wire of the same AC contactor coil B needs to be connected to the normally closed output contact of AC contactor A coil, so that in the working state of B contactor A, when contactor A needs to be closed, the normally closed point of contactor A coil clutches, so that A contactor has not yet worked in the case that B contactor has been disconnected, and when A contactor works will not occur in phase, this is the interlocking of secondary lines, The contactor is connected to the power supply after the button switch is pressed, so that the coil is closed after being energized, so that the permanent voltage can be obtained on the normally closed contact after the clutch of the other contactor, and it works normally.

The inlet and outlet wire connection of the button switch is also wired according to the principle of coil connection, resulting in interlocking

For coils with three terminals--- I don't remember if there were two A1 or two A2, but just use one of the A1 or A2.

If there is only one two terminals, it is even simpler, one end is connected to the outlet end of the button, and one end is connected to the other phase wire, pay attention to self-locking.

Summary. Hello, use AC contactor to control the forward and reverse rotation of the motor, you can choose CJX2-1210 a group of normally open auxiliary contacts and a group of normally closed auxiliary contacts of the contactor, you can also add a group of normally open and a group of normally closed auxiliary contacts.

Hello, use AC contactor to control the forward and reverse rotation of the motor, you can choose CJX2-1210 a group of normally open auxiliary contacts and a group of normally closed auxiliary contacts of the contactor, you can also add a group of normally open and a group of normally closed auxiliary contacts.

I'm sorry I don't understand, but can you elaborate on that?

The rated current of CJX2-1210 AC contactor is 12A, there are three groups of normally open main contacts, a group of normally open auxiliary contacts, because there are only normally open auxiliary contacts, there is no normally closed auxiliary contact, two AC contactors are needed to realize the forward and reverse rotation of the control motor, and it is easy to make the three-phase form a short circuit, so a group of normally closed contacts are added to the contactor when in use, and the normally open contacts are connected to the two ends of the starting button for self-protection, and the normally closed points are connected in series in the control loop for interlocking.

In order to ensure that the phase sequence of the motor can be reliably changed when the two contactors act, the upper port wiring of the contactor should be consistent, and the lower mouth of the contactor should be phase-adjusted.

Compared with single-phase asynchronous motors, three-phase asynchronous motors have good running performance and can save various materials. According to the different rotor structures, three-phase asynchronous motors can be divided into cage type and winding type. The asynchronous motor of the cage rotor has a simple structure, reliable operation, light weight and low cost, and has been widely used, but its main disadvantage is that it is difficult to regulate the speed.

The main circuit adopts two contactors, namely the forward contactor KM1 and the reverse contactor KM2.

When the three pairs of main contacts of the contactor KM1 are turned on, the phase sequence of the three-phase power supply is connected to the motor according to U V W.

When the three pairs of main contacts of the contactor KM1 are disconnected, and the three pairs of the main contacts of the contactor KM2 are turned on, the phase sequence of the three-phase power supply is connected to the motor according to W V U, and the motor rotates in the opposite direction.

A two-way knife switch can be used, and the indirect motor is connected to two phases on both sides.

If you connect any of the 3 wires to the motor, the motor can be reversed by swapping the connection position of any 2 of the wires. According to this principle, control switches and wiring can be selected. After connecting the wire, check and confirm it first, do not connect it to a short circuit, and pay attention to safety.

Forward and reverse rotation requires two AC contactors to control the motor respectively, these two AC contactors can not act at the same time, when the forward transmission or reversal, the corresponding contactor is engaged, the only difference is that two of the three live wires connected to the motor have changed phases.

Self-locking means that after the contactor is engaged, the button will not be powered off if the contactor is released, as the name suggests, it is called self-locking, and you can press the stop button if you want to stop. Wiring is to start the button, that is, the normally open contact, the normal open contact, the normal open contact, and then connect the coil in series;

Interlock means that the normally closed or normally closed contacts of two contactors in front and reverse are connected in series in each other's coils.

Self-locking: It is to connect the starting button in parallel with the moving contact on the contactor and then connect it in series with the coil, so that when the start button is released, the contactor is normally engaged due to the coil energization.

Interlocking: that is, the dynamic breaking contacts of the two contactors that control the forward and reverse rotation of the motor are connected to each other's coils in series in each other's control circuit.

A motor controlled by a three-phase AC contactor can change the direction of rotation of the motor by changing the phase sequence of any two-phase power supply.

If you want to connect the motor forward and reverse car circuit, you can first search for the motor positive and negative car schematic diagram from the Internet, understand the principle, and it is not difficult to make the actual connection

The forward and reverse motor control circuit requires two AC contactors to change the phase sequence wiring. Below is the physical wiring diagram and wiring schematic. After the wiring is completed, check the wiring carefully, otherwise it will cause a short circuit and damage the electrical appliances. Remember!!

First of all, we must clearly understand what a contactor is, it is a switch with a coil, understand its normally closed and normally open, and understand the principle. Then connect the forward and reverse rotation of the motor, and the single-phase motor is different from the three-phase motor. The forward and reverse rotation of the three-phase motor is the simplest, only one of the phases can be changed, and you can understand the principle by yourself.

The contactor for the forward and reverse rotation of single-phase motors is complicated. Therefore, first learn the three phases, and then search for the map to learn the single phase. As long as it is the principle of forward and reverse rotation of the motor, it is necessary to understand.

Forward and reverse reversal is commutation through a contactor. Commutation changes the phase sequence.

Xiaobai wants to learn, the motor forward and reverse control circuit, it's really simple to say!

As long as you can study patiently, memorize those electrical symbols with your heart, and practice slowly!

First of all, let's take a closer look!

Schematic diagram of forward and reverse rotation control of the motor.

Then learn to correspond to the electrical symbol of the real thing, figure out who is who, and then slowly learn to select, wiring, wiring, test the machine!

After the wire is connected, it must be carefully checked and checked to confirm that it is correct before it can be powered on for testing! Don't take it lightly!

The physical wiring diagram of the forward and reverse rotation control of the motor.

Dear, hello, the forward and reverse need to use two contactors is a three-phase AC asynchronous motor, because the three-phase AC asynchronous motor, when the power phase sequence is cracked and reversed, it will be reversed, and the power phase sequence is reversed, which is to make any two of the phase lines position reversed.