Mechanical interlocking contactor

The mechanical interlocking contactor is mainly used for AC 50Hz or 60Hz, and the rated operating voltage to 660V, rated operating current to the following 95A circuit, for motor reversible control. Its mechanical interlocking mechanism ensures the reliability of the conversion of the two reversible contactor.
Two contactor combination in the control of the motor is reversed called reversible contactor. The mechanism that is installed between two contacts, called mechanical linkage. If there is no the device, press the control button on the left of the contactor and press the control button on the right side of the contactor, the two contactors will pull in, the main circuit is short circuited. This device is to prevent and pull two contactors.
CJX2-N (LC2-D) series reversible chain AC contactor is suitable for AC 50Hz or 60Hz, voltage to 690V, current to 95A circuit, and can be used for motor reversible control. Its mechanical interlocking structure, which ensures the reliable operation of the two reversible contactor.
Products comply with GB14048.4 standards.
Some of the more commonly used models are:
CJX2-09, CJX2-12, CJX2-18, CJX2-25, CJX2-32
CJX2-40, CJX2-50, CJX2-65, CJX2-80, CJX2-95
LC2-D09, D12 LC2-, D18 LC2-, D25 LC2-, D32 LC2-
D40 LC2-, D50 LC2-, D65 LC2-, D80 LC2-, D95 LC2-
Model rated operating current AV-3A, 400V control power KW auxiliary contact number notes
400V 415V 440V 690V 230V
CJX2-09N 5.5 NC 92.2444 installation method except the screws, the installation of the 35mm
CJX2-12N 5.5 7.5 5.5 NC
CJX2-18N 7.599 1847.5 NC
CJX2-25N 255.511111115 NC
CJX2-32N 18.5 327.5151515 NC
CJX2-40N 18.52230 NO+NC addition screw is equipped with 75mm mounting rail
CJX2-50N 501522223033 NO+NC
CJX2-63N 6318.530303737 NO+NC
CJX2-80N 802237374545 NO+NC
CJX2-95N 952545454545 NO+NC
Three: CJX2-N (LC2-D) reversible AC contactor appearance and installation size

QJX2 series star delta motor starter

Large power motor starting current is very big, in order to avoid the impact of large current on the line, the motor angle method is changed to start with a certain inertia, the rotation speed of a certain inertia, then turn to the angle of the start, the starting current of the 1/3. From 3 contacts, 1 time relay and button.

QJX2 series star delta starter (hereinafter referred to as starter), is suitable for AC 50Hz or 60Hz, rated insulation voltage of 660V (690V), the AC-3 type of three-phase squirrel cage induction motor with rated working voltage of 380V, power 80KW, and the following is used to control the stator winding from “Star” to “triangle” for starting and stopping. After assembling the thermal relay of the corresponding specification, the overload protection of the motor and the related circuit can be protected.

The starter and QJX4, LC3-D have the same functional specifications can be equated with the use of.

The function and principle of Starter Motor are respectively:
1, role:
The motor starter is device for auxiliary motor starting, the motor start smoothly, little impact on the grid, but also to achieve the soft parking of motor, brake, overload and lack of protection. The motor starter is mainly used for large motor and asynchronous motor.
2, working principle:
The distance between the plate to the liquid resistance value in the starting process always meet the mechanical property requirements on the on resistance value, thereby causing the motor to obtain the maximum starting torque and the minimum starting current and starting a smooth. Specific work process is: to start the main motor active polar plate in a small power gear system driven by slowly moving, change the distance between the two plates, the string into the rotor circuit of liquid resistance value change meet the above conditions, the motor speed increased. When the distance between the two plates is the minimum, the motor speed of the motor reaches the rated speed, the liquid resistance is short, the starting process is completed, the operation state is transferred.

GV2ME series motor protective circuit breaker

Motor protector is to protect the motor, the motor is overload, lack of phase, short circuit, short circuit, over voltage, under voltage, leakage, three phase unbalance, overheating, bearing wear, stator rotor eccentricity, to alarm or protect the device.
Common types of motor protectors
1, thermal relay: Ordinary small capacity AC motor, working condition is good, there is no frequent starting and other bad conditions of the situation; because of poor accuracy, reliability can not be guaranteed, not recommended.
2, electronic type: detection of three-phase current value, the whole set current value of potentiometer or pull off code switch, circuit is generally used in analog mode, the use of anti time limit or time limit for work. Protection functions including overload, lack of phase, blocking, etc., the type of failure to use the indicator light shows that the operation of the use of digital tube display.
3, intelligent: detection of three-phase current value, the use of single-chip microcomputer, to achieve the motor intelligent integrated protection, set protection, measurement, communication, display as one. The setting current adopts digital setting, operation panel button to operate, the user can according to the specific circumstances of the motor in the field of various parameters correction setting; the use of digital tube as display window, or the use of large screen LCD display, can support a variety of communication protocols, such as ProfiBUS, ModBUS, etc., the price is relatively high, for more important occasions; high voltage motor protection are the use of intelligent protection device.
4, thermal protection: in the motor of the buried thermal element, according to the motor winding temperature of the motor, the protection effect is good, but the motor capacity is large, need to use the current monitoring type, to avoid the temperature of the motor when the temperature rises sharply, due to the delay of the temperature measurement element, resulting in motor winding damage.
5, magnetic field temperature detection: in the motor of the magnetic field detection coil and temperature measurement element, according to the motor internal rotating magnetic field changes and temperature changes in the protection, the main functions include overload, plugging, lack of phase, over heat protection and wear monitoring, protection function is perfect, the need to install magnetic field detection coil and temperature sensor.

schneider ac contactor LC1D series

LC1-D09M7C Schneider AC contactor is widely used in the power of the open circuit and control circuit. It uses the main contact to open and close circuit, with auxiliary contacts to execute control instructions. The main contact is normally open contact, and the auxiliary contact is often two pairs of normally open and normally closed function of the 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 contactor can be composed of a mechanical reversible interlocking magnetic starter, a star delta starter
– contactor is a protective type, and the action structure is a direct acting type, and the contact is a double breakpoint.
– has the characteristics of small size, light weight, low power consumption, long life, safe and reliable, etc.
– according to the user to choose to increase the auxiliary contact group, the air delay is a combination of a variety of first class products
– when installing, should be in accordance with the provisions of the installation, the terminal A1 of the contactor coil in line with the top of the head, consistent with human visual habits
– the contact of the metal mounting base plate shall be properly grounded
– terminal screws should be tightened, check the wiring is correct, should be in the main contact is charged and the attracting coil power several times, action test is reliable, can be put into use
If there is abnormal noise, when in use, may be a core pole on dirt wipe face, please
– use, should be regularly check the product components, the movable part is not stuck, fastening parts without loose, spare parts if there is damage, should be replaced in time

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.

Overview of domestic and foreign Principal company products

1.ABB B series, A Series in early 1980s, the Shanghai people’s Electrical Appliance Factory, Beijing Electric Factory as a production license form, technology introduction of ABB B series has a preliminary modular structure; after the launch of the EB, EH series; 90’s launched the A series. A series contactor has 9 ~ 1050A22 current level, 8 kinds of models, the application of the environment temperature is: – 40, 70, is the characteristics of the contactor.
2 Fuji Corp’s SC-E series SC-E series is a joint venture between Changshu Switch Factory Co., Ltd. and Fuji Corp, there are 9 ~ 800A18 current rating, 10 kinds of models. In addition to the characteristics of the module, the volume is small, its bright spot. For example, the SC-E25 of the rated current 50A of 90mm x 54mm x 96mm, only for the same current rating of ABB A50D 50.6%, is a Schneider Inc LC1-D50 38.5%, with a high reliable contact performance (DC5V, 3mA).
3 Schneider Inc LC1-D Series in the early 1980s, Tin Shui 213 machine tool electric plant to introduce the Schneider Inc LC1-D series of contacts, is the first to enter the country of the contactor. At that time, LC1 by the current size of 9 ~ D 95A series and 115 ~ F 780A series. In recent years, the introduction of a current level of 9 ~ 620A20, 8 models of the LC1-D series. The product is a typical representative of the modular structure, further reducing the flying arc distance, improve the protection level, operating frequency can be as high as 3600 /h (small current specifications) or 2400 /h (large current specifications).
4 SIEMENS’s 3RT series SIEMENS 3RT series contactor inherited the 3TB’s life span, the coil module, easy to replace the advantages, and the realization of the full plastic and high protection (IP2x). Full range of 7 to 500A19 current rating, 7 kinds of models, the highest mechanical life of 30000000 times, the average power consumption of the coil is easy to be similar to the characteristics of the same.
5 domestic C J40, CJ45 series products of this series of products mainly by Shanghai Electrical Apparatus Research dominated development, Hangzhou Zhijiang switch factory, Shanghai People’s Electrical Appliance Factory, Tianjin Baili, Chint Electric Appliance Co., Ltd., the production of C J40, CJ45; Tianshui 213 factory introduced production gsc1 column; Shanghai Liangxin electrical appliance Co., Ltd. of the Ndc1 series, after the two basic sources in the form of LC1. CJ45 from 6.3 to 800A19 current specifications, 10 kinds of models, the mechanical and electrical life of 10000000 times and 1000000 times, with a modular and fully plastic structure, there is a delay, coil surge suppression, mechanical interlocking and other accessories, in particular, the use of Ag-Ni (16A and below) or AgSnO2 (16A above), with environmental protection.

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.

Maintenance and inspection of AC contactor

Operation inspection items for AC contactor
1 check whether the maximum load current exceeds the load value of the contactor.
2 check whether the temperature rise of the contactor coil is less than 65 degrees.
3 monitor contactor has no acoustic and electromagnetic system with and without excessive noise and overheating.
4 check the contact system and connection point has no overheating and burning phenomenon.
5 check out the arc cover is complete, if damage should be replaced after re operation.
6. Maintenance contact system, with fine contusion or fine sandpaper polishing contact surface, keep the original state of contact, adjust the contact surface and the contact pressure, to keep the three-phase contact at the same time, the contact burning serious should be replaced.
7 check the internal accessories of the arc cover, and clean the smoke marks and other impurities.
8 check the insulation of linkage mechanism, and check whether there is deformation, displacement and loose phenomenon.
9. Check core pull of the contact surface is smooth, whether there is uneven or oil pollution situation, short circuit ring whether fracture or excessive oxidation and slippage, attraction is good, after disconnection, whether to go back to the normal position.
10 AC contactor’s cleaning and the surrounding environment inspection.
11 the signal indicating whether the AC contactor is in line with the state of the circuit.
12 electromagnetic coils without overheating, short circuit ring on an electromagnet without prolapse and damage phenomenon.
13 auxiliary contact with non erosion phenomenon.
14 core pull is good, there is no more noise, after disconnection can return to normal position.
15 around the environment is not changed, there are no exception to the normal operation of the factors, such as excessive vibration, ventilation, electrical dust, etc..

Installation and use of AC contactor

1 AC contactor operation problem
AC contactor is a widely used control appliance, mainly used to control motors and other electrical equipment operation and stop, an ordinary AC contactor in the attraction, the coil of the AC contactor still through the alternating current, power consumption is relatively large, so the heat coil, noise is relatively common, not only a waste of electricity can and coil insulation easily aging makes the AC contactor shortened life expectancy.
Function and using effect of energy saving module of 2 AC contactor
In an ordinary AC contactor is used for the energy saving module, reduces the AC contactor suction state power greatly, coil temperature will greatly reduced, the contactor coil insulation layer because of the high temperature aging, so as to prolong the service life of the contactor. The noise greatly reduced the operating state of AC contactor, the contactor to improve the use environment conditions. Ordinary AC contactor can only be rated voltage of 85% to 110% of the range, when the coil ends voltage higher than the rated voltage of 110%, AC contactor coil may be due to heat and burn, after the installation of this module in the contactor, AC contactor to withstand voltage fluctuations in power, in the case of high power supply voltage, AC contactor coil will not burn.
Join the module after the contactor sound crisp and powerful, attracting state current is only not the installation of the module of 10% ~ 40%, power-saving rate of 90% ~ 60%. And contactor noise reduced, for a long time to contactor attracting, the contactor coil surface without obvious temperature rise, even and cool feeling, to CJ20-400A contactor test, without energy-saving module (coil voltage 220V) contactor in the attraction of the reach a steady state when the voltage is 220V, current for 0.615A, noise is 52.5dB, temperature 105.2 DEG C, the installation module after the steady state is reached when the voltage is 220V, current 0.184A, noise is 36.6dB, 26.8 degrees Celsius temperature, seen in a power saving rate of 70%. By the above experiments can be seen: installing l AC contactor energy-saving module in the contactor coil circuit, the contactor current, noise and temperature rise decreased drastically. It is proved that the module of AC contactor with decrease coil loop current, reduce noise, reduce temperature rise.
Now Kang Bao county all street lamps have been installed in the module, a complete solution to the interference of the noise of the contactor at night when the residents of the interference, saving a lot of electricity.
Installation and application of energy saving module of 3 AC contactor
At the top of the module, there are two input terminals, and the lower part of the lower side of each have two output leads, the lower part of the module output wire connecting the terminal (A2, A1), the input terminal of the module to the end of the AC contactor control circuit.
Energy saving module of the working voltage of AC220V, the input terminal can only access the operation of the 220V power supply, access to the 380V power, but the output of this module can drive coil rated voltage 380V AC contactor, this point, please pay special attention to!
If the contactor coil voltage is 220V, the wire will be removed from the terminal, and then the output of the module is connected to the coil of the contactor. If the original contactor coil voltage is 380V, to put the module on the AC contactor coil circuit, but also the original control circuit two power lines in a root change received N line (the original control power line connecting two phase, voltage of 380V, now one of the strings instead received N line, enable the control voltage change 220V), if the original control circuit and rated voltage 380V indicator light, an intermediate relay, a time relay and so on element, but also the replacement of these components is the rated voltage is 220V element.

electric motor starter contactor

Starter
Control motor starting and stopping the use of electrical appliances. Motor starting, the starting current to exceed the motor rated current many times, starting current, the voltage of the line temporarily to be reduced. In case of large capacity, the voltage is lower, and it has little influence on the work of other electrical equipments on line. Therefore, the medium and small capacity AC motor can be used in direct starting mode. If the line voltage is reduced more, on the one hand, it will affect the operation of other equipments on the line. On the other hand, the starting torque of the motor will be reduced, the starting will be difficult, and even starting failure.
The starter is divided into two types, manual and automatic. The common use of a star delta starter in the manual starter of AC motor, which belongs to the starting mode of the buck. At the start, the winding is connected to the star, so that the applied voltage of each phase winding is reduced to the phase voltage to reduce the impact of the starting current. In the starting process, the three-phase winding is converted into a triangle by the method of triangle, and the starting of each phase voltage is raised to the line voltage. The manual starter of the DC motor is a series of current limiting resistance in the motor winding circuit to limit the starting current, and with the manual operation to cut series resistance, the speed of the DC motor is gradually increased, and the starting time of the whole series resistance is completed. The automatic operation of the starter is divided into two kinds of direct starting and decompression starting. The commonly used direct starter is electromagnetic starter, which has the function of loss of pressure and overload protection. Direct starters and two kinds of irreversible and reversible. The non reversible starter can only complete the starting and stopping of the motor; the reversible starter can accomplish the forward rotation starting, reverse rotation starting and stopping function. The automatic pressure relief starter has the self coupling decompression starter, the frequency sensitive starter and the integrated starter.