DC Contactors used in electric vehicle

Electric vehicle DC contactor is mainly used to control the motor switch;
The contactor adopts modular design, can with minimal parts assembly customer required number of contacts and clients need contact form (normally open, normally closed and conversion). The series products contact breaking high voltage, and the transverse blowing magnetic field quenching, the maximum open circuit voltage can be reached 220VDC. products applicable to the programmable power supply or uninterrupted power supply system, forklifts, electric vehicles, engineering machinery system.

Identification method for auxiliary contact of AC contactor

1 marked with NO and NC
NO is the abbreviation of open normal (often) in English, NC is the abbreviation of close normal (Chang Bi).
2 marked with digital serial number 11 or 12, etc.
Behind one digit (1, 2) represents a normally closed contact (3, 4), which is normally open contacts. There are (5, 6), (7, 8) on behalf of the time relay is normally closed, normally open contact group.
3 can the auxiliary contact of the AC contactor be directly connected to the 220V?
Can, in fact, many of the circuit’s indicator is the 220V.
4 function of auxiliary contact
AC contactor has three pairs of main contacts, the above three terminal is connected to a power supply, below the 3 terminal is connected to electrical equipment, attracting coil connected control circuit, when a pick-up coil, iron core generates magnetic, attract the armature, and the main contact bonding and electrical equipment through electrical work. In addition to the auxiliary and normally open and normally closed electric shock, can be used as a lock and mutual lock control. The function of the normally open contact in the control loop is described in the following diagram.

5 normally open normally closed recognition method
Million with sheet resistance profile measurements (uncharged measurement) in general as a group, the channel resistance is zero or near zero) as the name implies the is normally closed, open circuit (resistance of infinity) is normally open.

When to replace an ac contactor?

Q: AC contactor damage to what extent should be replaced?
A: (1) AC contactor three-phase main contacts (dynamic and static contacts burning area in more than 25%, the depth of loss in more than 1mm, the depth of loss in more than 1mm
(2) the contactor coil burned, the main contacts outside the terminal lined severe burns
(3) the main transmission mechanism of fracture or deformation of the contact, the contact can not be closed and blocked stuck
When the contact surface is caused by the contact surface of the contact surface, the contact surface is reduced. If it is a large power motor, it can be considered to start with decompression or frequency conversion, improve reliability
Replacement of AC contactor should be the first to buy the same parameters of the contactor, coil voltage, contactor capacity and model,
When the contactor can not be charged, the installation of screws and the time to pay attention to can not be lost in other electrical components to avoid a short circuit, if the condition is best to get a little bit magnetic, so that the screw can not be removed, and the best time to record the wire to avoid installing the wrong line,

3 phase contactor

Three-phase power supply is connected with the AC contactor three main contact, also three main contacts connected with the motor, AC contactor coil is connected with the control circuit and controlled by buttons of AC contactor suction can be.
A: the general three-phase contactor, a total of 8 points, three road input, three output, there are two control points. Output and input, it is easy to see. If you want to add a self – lock, then you need to be from the output point of a terminal line to the control point.
Two: first, the principle of this single AC contactor. It uses external power to add on the line to produce an electromagnetic field. And pull power, power point of contact is disconnected. You should be aware of the principle of the external power supply, it is the two of the coils, the general in the lower part of the contactor, and on one side. Other several road input and output in the upper part, a look at the. Also pay attention to the number of external power supply (220V or 380V), the general subject of. And note that the contact point is often closed or open. If there is a self – lock control, according to the principle of the line on the line.

AC Contactor auxiliary module

The contactor auxiliary contacts module
LA1-DN02C
LA1-DN04C
LA1-DN11C
LA1-DN13C
LA1-DN20C
LA1-DN22C
LA1-DN31C
LA1-DN40C
Surge suppression module
LA4-DA2U
LA4-DA2N
LA4-DA2E
LA4-DA1U
LA4-DA1G
LA4-DA1E
Contactor interlocking modules
LA9-D09978C
LA9-D11502
LA9-D50978C
Contactor module side auxiliary contacts
LA-D8N11
LA-D8N20
Contactor delay module
LA-DS2
LA-DT0
LA-DT2
LA-DT4
LA-DR0
LA-DR2
LA-DR4
Thermal relay base
LA7-D1064
LA7-D2064
LA7-D3064
contactor with switching capacitor
LC1-DGK11M7C
LC1-DMK11M5C
LC1-DMK11M7C
LC1-DPK12M7C
LC1-DTK12M7C
LC1-DWK12M5C
LC1-DWK12M7C

air conditioner contactor

In electrical engineering, because it can quickly cut off the main circuit of AC and DC and can frequently connected with the current control (some types of up to 800 Amperes) circuit device, so often used in motor do as the control object, can also be used to control factory equipment, electric heater, machine tools and all kinds of electric power unit and power load contactor can not only connect and disconnect the circuit, but also has low voltage release protective effect. Contactor control capacity, suitable for frequent operation and remote control. Is one of the important components in the automatic control system. In industrial electrical, the model of the contactor is a lot of electric current in the range of 5A-1000A, its use is quite extensive.
AC contactor is used to open and close circuit, with auxiliary contacts to control loop. The main contact is normally open contact, and the auxiliary contact often two pairs of normally open contact and normally closed contact, small contactor is also often used as the intermediate relay with the main circuit. The contact of AC contactor, made of silver tungsten alloy, has good electrical conductivity and high temperature resistance. The action of AC contactor power source to communicate through the generated by the iron core coil with a magnetic field, the electromagnet core is made up of two “mountain” shape of young silicon steel sheet laminated, which a fixed iron core, a coil is sheathed, voltage can choose a variety of. In order to make the magnetic stability, pull side core plus short circuit ring. AC contactor is on the loss of power, relying on the spring reset. The other half is the active iron core, the structure and the fixed iron core, used to drive the main contact and auxiliary contact closure. More than 20 amps contactor with arc shield, the circuit is disconnected from the electromagnetic force, fast breaking arc, the protection of contact. With a high frequency of operation, the highest operating frequency can be up to 1200 times per hour when the power is turned on and off. The service life of the contactor is very high, the service life of the machine is usually ten million times.
Technology development
AC contactor is made as a whole, and its appearance and performance are improved, but the function is always the same. Regardless of the extent of the development of the technology, the ordinary AC contactor has its important status. Air electromagnetic contactor electromagnetic contactor (in English: magnetic Contactor) is mainly composed of a contact system, electromagnetic operating dynamic system, bracket and an auxiliary contact and the shell (or frame). Because the AC electromagnetic contactor coil commonly used AC power supply, after the excitation contactor, usually a high decibel “slightly” noise, which is the electromagnetic contactor characteristics. After the 1980s, countries of AC contactor electromagnet soundless and power-saving, one of the basic feasible solution is the AC power supply with a step-down transformer, the internal rectifier DC conversion power supply, but the complex control mode does not see more. The vacuum contactor is vacuum contactor contactor contact system by vacuum chamber degaussing. Semiconductor contactor is a kind of contactor, which is operated by the conduction state and the state of circuit breaker. Permanent magnet contactor permanent magnetic AC contactor is using pole same-sex repulsion, opposites attract the principle, permanent magnet drive mechanism to replace the traditional electromagnet drive mechanism and the formation of a micro power contactors.