Who knows what is the working principle of the maintenance electrician wiring practice, contactor se

It is connected in series through the auxiliary contact (normally open, normally closed) of the contactor, so that after the contactor coil is electrified, the electricity disappears, and the coil can still be energized through the auxiliary contact, so as to adsorb!

Summary. How to draw a contactor self-locking circuit diagram? How does it work?

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The contactor is self-locking, also known as self-protection. It is to keep the contactor coil continuously energized after starting by the start button (joging), so that the contact path state is maintained.

Contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC), which are used in electricity, distribution and electricity occasions. Contactor in a broad sense refers to the electrical appliances that use the current flowing through the coil to generate a magnetic field and close the contact to control the load in industrial electricity.

Expansion of capital distribution difficulties:

In electrical engineering, because the main circuit of AC and DC can be quickly cut off.

It can be frequently connected to the device with high current control (up to 800A) circuit, so it is often used in the motor as a control object, and can also be used to control plant equipment, electric heaters, working machine tools and various power units and other power loads, the contactor can not only turn on and off the circuit, but also has a low voltage release protection effect.

The contactor has a large control capacity, which is suitable for frequent operation and long-distance control, and is one of the important components in the automatic control system.

In industrial electrical, there are many models of contactors, and the working current ranges from 5A to 1000A, and its use is quite extensive.

The working principle of the contactor is that when the contactor coil is energized, the coil current will generate a magnetic field.

The generated magnetic field makes the static iron core produce electromagnetic attraction to attract the moving core, and drive the AC contactor point to act, the normally closed contact is disconnected, and the normally open contact is closed, and the two are linked. When the coil is de-energized, the electromagnetic attraction disappears, and the armature is released under the action of the release spring, which restores the contact, the normally open contact is disconnected, and the normally closed contact is closed.

What is the principle of contactor self-locking, the old electrician comes with a circuit diagram explanation, which is easy to understand and will look at.

The two live wires are connected to the two ends of the contactor coil respectively, and the twist switch is connected to the circuit. After pressing the start button, the auxiliary moving contact of the contactor closes and locks to keep the circuit working normally. The diagram is as follows.

When the start button is closed, the circuit is energized, and the contactor auxiliary contact is closed, which can maintain the coil energized, and this effect is called self-locking.

First of all, use a live wire to connect the stop button NC1 to the DAO post, and then the NC2 terminal post comes out one.

The special wire is connected to the No3 binding post of the normally open button, and the No4 binding post is connected to a wire directly to the A2 binding post of the contactor coil.

Then stop button NC2 binding post and a wire to the contactor normally open auxiliary contact 13 binding post, and finally in the contactor normally open auxiliary contact 14 binding post to connect a wire to the contactor coil another binding post A2 to achieve the self-locking interlocking effect.

Finally, connect the neutral wire to the normally closed NC95 binding post of the thermal relay, and connect the NC96 terminal post to the contactor coil binding post A1.

Extended information: AC contactors often use three arc extinguishing methods: double-fracture electric arc extinguishing, longitudinal seam arc extinguishing and grid arc extinguishing.

It is used to eliminate the arc generated by the dynamic and static contacts in the process of splitting and closing. Contactors with a capacity of more than 10 A have arc extinguishing devices.

AC contactors also have auxiliary components such as reaction springs, buffer springs, contact pressure springs, transmission mechanisms, bases and binding posts.

To put it simply, the electric source is connected to one end of the contactor coil through the button switch DU normally open contact, and the other DAO head is connected to zero.

Special line, this is the genus of jog.

The power supply passes the normally open contact of the start button, and a pair of normally open contacts of the contactor are connected in parallel on the contact, and then a normally closed contact of the stop button is connected in series, and then one end of the contactor coil is connected to the zero wire at the other end, which is a self-locking control with start-stop.

The normally open contacts of the contactor are used for wiring.

BAI of AC contactors

Jog and self-locking control connection diagram:

The ZHI AC contactor is a type of contactor, and its typical DAO structure is divided into double-version breakpoint direct-acting type (LC1-D F*) and single-right open-circuit rotating type (LC1-B*). AC contactors are combined with relay control loops, remote control or interlocking related electrical equipment. At present, the most commonly used products are mainly CJX2 series, CJ20 series, CJT1 series, 3TB, B series, etc.

Self-locking control is to lock yourself yourself, that is, after the starting circuit is turned on, it is disconnected and started, and the contactor is still on.

The following figure shows the contactor self-locking circuit.

After pressing the start button once, the auxiliary normally open contact of the contactor is engaged to supply power to the contactor coil to form a self-locking, here although the start button has been disconnected, the contactor still keeps working, unless you press the stop button, the contactor stops working.