LS contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC), which are used in electricity, power distribution and consumption. 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.
The AC contactor uses the main contact to open and close the circuit, and the auxiliary contact to turn on the control loop. The main contact is generally a normally open contact, while the auxiliary contact often has two pairs of normally open contact and normally closed contact, and the small LS contactor is often used as an intermediate relay with the main circuit. The contacts of the AC contactor are made of silver-tungsten alloy, which has good electrical conductivity and high temperature ablation resistance. The power of the AC contactor is derived from the magnetic field generated by the AC through the coil with an iron core, and the electromagnet core is composed of two "mountain" shaped fine silicon steel sheets stacked, one of which is fixed with a coil, and the working voltage can be selected in a variety of ways. In order to stabilize the magnetic force, a short-circuit ring is added to the suction surface of the core. After the AC contactor loses power, it relies on a spring to return. The other half is the movable core, which is constructed in the same way as the fixed core, and is used to drive the closure and disconnection of the main and auxiliary contacts. The contactor above 20 amps is equipped with an arc extinguishing cover, which uses the electromagnetic force generated when the circuit is disconnected to quickly break the arc and protect the contact. The LS contact device can be operated at a high frequency, up to 1200 times per hour when the power is turned on and off. Contactors have a high service life, typically millions to 10 million mechanical cycles and hundreds of thousands to millions of electrical cycles.
In terms of electrical engineering, LS contactors are often used in electric motors as control objects, and can also be used to control power loads such as factory equipment, electric heaters, working machines and various power units, etc., because they can quickly cut off the AC and DC main circuits and frequently connect to high-current control (some types can reach 800 amperes) circuits. The contactor has a large control capacity and is suitable for frequent operation and long-distance control. It is one of the important components in the automatic control system. In industrial electrical, there are many models of LS contactors, and the current ranges from 5A to 1000A, and its use is quite extensive
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Electricity-producing permanent magnet AC contactor structure
The contactor is mainly composed of a drive system, a contact system, an arc extinguishing system and other parts.
1. Drive system: The drive system includes electronic modules, soft iron, and permanent magnets, which is an important part of the permanent magnet contactor.
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The selection principle of AC contactors - LS produces electricity
1. The voltage level of the AC contactor should be the same as the load, and the type of contactor should be suitable for the load.
2. The accounting current of the load should be less than or equal to the additional working current of the contactor.
The turn-on current of the contactor is greater than the starting current of the load, and the breaking current is greater than the load ...
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How to use the installation wiring of the LS inverter
1. Circuit wiring
(1) The input (R, S, T) and output (U, V, W) of the inverter cannot be connected incorrectly;
(2) Wire diameter selection
(1) The wiring of the power supply and the inverter and the wire diameter selection method of the motor of the same capacity are the same;
(2) The wiring between the inverter and the motor should consider the line electricity.
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Models and features of LS Metasol series products
Metasol series MS (100A and below) products are newly launched and the primary product specifications: contactors, thermal relays, and center relays.
Features:
The body is small, the internal structure is sealed, and the safety factor is high
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The protection measures of the power generator inverter for the motor
The protection of the motor by the power converter mainly includes the following aspects: overvoltage protection, undervoltage protection, overcurrent protection, phase loss protection, inverter protection, overload protection, grounding protection, short circuit protection, overfrequency protection and stall protection.
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The lightning protection port of the inverter - LS generates electricity
According to the applied engineering practice, variable frequency drive (VFD) lightning strikes can be roughly divided into direct lightning, induced lightning and conducted lightning. But no matter what form it takes to reach the device, it can be summarized as a lightning surge from the following four parts, which are called lightning protection ports here, with V ...
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Wiring method of the main circuit of the inverter - LS power generation
1. The power supply should be connected to the R, S, and T terminals of the VFD, and should not be connected to the VFD (U, V, W), otherwise the VFD will be damaged. It is necessary to clean up the trivial parts of the wire head after wiring, which may lead to abnormalities, failures, and failures, and it is necessary for the VFD to always be clean. When punching holes in the console, note that ...
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Inverter failure and solution - power generation
1. HW problem
This problem may be a fault unique to LG-IG5 series inverters, and the main causes are as follows:
(1) Damage to the cooling fan. Due to the use of environmental and other factors, the friction of the fan bearing is too large, causing the fan load to be too large and showing H ...
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Precautions for the selection of peripheral equipment for LS power inverter
The peripheral equipment of the inverter mainly includes cables, contactors, air switches, reactors, filters, braking resistors, etc. Whether the selection of the peripheral equipment of the inverter is correct and suitable also directly affects the normal operation of the inverter and the service life of the inverter.
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The method of resetting the fault of the inverter
1. Power off the inverter and power it back on;
2. Press the FN button on BOP-2;
3. After the digital input 3, the default setting of 3 is reset to the problem;
4. Press the P button or power off, in the case of no problem;
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The difference between voltage type and current type inverter - LS generates electricity
The differences between voltage type and current type inverter are mainly manifested in:
(1) the load of the buffer inverter of reactive power is an asynchronous motor, which is an inductive load, and in addition to transmitting active power between the intermediate DC link and the motor, there is also the exchange of reactive power. Because power electronic switches ...
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Specification steps for the safe operation of generator sets – power generation
Standardized procedures for safe operation of generator sets
1. Preparation before starting
(1) The operators of the computer room should abide by the safety operation procedures, wear work clothes and insulated shoes, and the crew should have a clear division of labor.
(2) Check whether the flywheel and part of the generator are not defective. ...
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The basic component of the inverter is LS power generation
The inverter is usually divided into 4 parts: the rectifier unit, the high-capacity capacitor, the inverter and the controller.
Rectifier unit: converts alternating current with a fixed operating frequency into direct current.
High Capacitance: Stores converted electrical energy.
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LS takes you to understand the inverter in the inverter
Contrary to the rectifier, the inverter converts the DC power into the communication power of the required frequency, and the 3-phase communication output can be obtained by turning on and off the 6 switching devices at the confirmed time. Take a voltage-type PWM inverter as an example to show the switching time and voltage waveform.
Control circuit ...
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The difference between multi-function inverter and general-purpose inverter - LS produces electricity
With the deepening of factory automation, the high efficiency and low cost of active warehouses, elevators, transfer systems, etc., as well as the high speed, high efficiency and high precision of small CNC machine tools, kneading and forming machines, textile and film machinery, etc.
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Inverter fault diagnosis - LS power generation
1. How to distinguish between heavy and light faults
When there is a problem with the light, the system announces the alarm signal and the fault indicator flashes. When there is a serious problem, the system will announce the problem indicator, the problem indicator will always be on, together announce the order to break the high voltage and stop closing, and store the problem ...
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Inverter air boost test step - LS power generation
1. Download the control program.
2. Put the inverter in open-loop experimental mode and set the appropriate parameters.
3. Connect the incoming cable of the inverter. The cable on the output side of the inverter is not connected.
4. Push the high-voltage cabinet to the experimental position, close the switch, and ...
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Meaning and classification of LS Electronic Motor Relay (EMPR).
The Electronic Motor Relay (EMPR) is a digital motor maintenance relay with an MCU that has a compact and compact form factor that can be combined directly with a contactor. Through the implementation of real-time data processing, high reliability and high precision can be completed, and it can pass through phase loss, reverse, unbalance, stalled rotor, connection...
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Wiring of the main circuit of the inverter - LS generates electricity
1. The power supply should be connected to the R, S, and T terminals at the input end of the inverter, and must not be connected to the output terminal (U, V, W) of the inverter, otherwise the inverter will be damaged. After wiring, it is necessary to clean the trivial wires, which may cause abnormalities, failures and problems, and it is necessary to always keep ...
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Application of servo motor - LS power generation
Quick to use:
There are three cables necessary for the operation of the motor: power cable; Motor power line, motor encoder line.
Control line interface X5:
Servo enable necessary pin C24V power supply (7,41) Servo enable SR ...
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