In the course of regularly checking the variable-frequency drive (VFD) of the tensile testing machine, we can visually check the operating status directly from the outside.
(1) The ambient temperature is normal, and it is required to be in the range of -10°C to +40°C, preferably around 25°C;
(2) Whether the VFD output current, voltage, frequency and other data displayed on the display panel are normal;
(3) The characters displayed on the display panel are clear and lack personality;
(4) The temperature measuring instrument detected that the VFD was overheated and had a peculiar smell;
(5) Whether the converter fan is normal, whether there is any abnormality, and whether the cooling pipe is smooth;
(6) / KLOC-0/ whether there is a fault alarm in the work;
(7) Check the maximum value of VFD AC input voltage greater than. Limit 418 (380V1.1), if the main circuit and input voltage exceed the limit, even if the VFD is not running, it will damage the VFD board.
In the process of using VFD, it is best to check that there are no anomalies.
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A brief description of the K120S series plc
K120S series PLC product is a unit PLC product introduced to the market by LS in 2004, which has laid a solid foundation in the low-end small machinery supporting industry with its high-performance price ratio. Relying on some special functions of the product, it has also won some industry praise.
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The given way of the inverter - LS generates electricity
Frequency given meaning and given method
The speed of the motor can be changed by changing the output frequency of the inverter. In order to adjust the output frequency of the inverter, the inverter must supply the signal of the changed frequency, which is called the frequency given signal.
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Interference phenomenon that often occurs in LS power inverters
1. As soon as the inverter of the heat exchange station is opened, the pressure transmitter jumps randomly;
2. In the water supply controlled by the inverter, the pressure transformer is used as a signal to collect the pressure, and the pressure transformer is disturbed by the inverter;
3. When the inverter starts the motor, the voltage converter signal is unstable and beats violently;
4. Pressure transformer (4-20 ...
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The vector control mode of low-voltage general-purpose inverter - LS power generation
The method of vector control frequency conversion speed regulation is to change the stator current Ia, Ib, Ic of the asynchronous motor in the three-phase coordinate system, after the three-phase - two-phase change, equivalent to the communication current Ia1Ib1 under the two-phase static coordinate system, and then after the directional rotation according to the rotor magnetic field, it is equivalent to synchronous rotation sitting.
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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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Inverter exception handling method - LS power generation
1. The working temperature of the inverter is high
1. Check whether the ambient temperature of the inverter is too high;
2. Check whether the cooling fan inside the device is working properly;
3. Check whether the ventilation pores and mask grilles are blocked;
4. Check if the load is too heavy.
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The Importance of Welding in Inverter Maintenance – LS Generates Electricity
Whether the welding skills of the inverter repair personnel are excellent is directly related to the quality and results after repair. If the welding quality is not up to standard during repair, the pins of the components will be broken when the components are disassembled, the printed circuits on the PCB will be damaged, the components will not be soldered firmly when the components are installed, and the two components ...
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Safety precautions for LS inverters
1. When the power supply is now powered or the inverter is in operation, do not open the shell of the inverter. Otherwise, an electric shock may occur.
2. When the front cover of the inverter is opened, do not run the inverter. Otherwise, you may be subjected to ...
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The difference between voltage inverter and current inverter - LS produces electricity
For example, the operating principle of voltage inverter is mainly to regulate the voltage source, and the voltage source regulates the current to achieve the role of conditioning, while the current inverter is to directly regulate the current to achieve the role of conditioning.
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Basic introduction to transistors - LS produces electricity
A transistor is a solid-state semiconductor device with a variety of functions such as detection, rectification, amplification, switching, voltage regulation, and signal modulation. A transistor is a variable current switch that can manipulate the output current based on the input voltage. Unlike general mechanical switches (e.g. Relay, swit...)
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Introduction of LS power products
1. Power-related products: medium, low and high voltage electrical products;
(1) Low Voltage Products: Molded Case Circuit Breaker, Air Circuit Breaker, LS Contactor & Overload Relay, Miniature Circuit Breaker, Dual Power Automatic Transfer Switch, Intelligent Motor Protector, Manual Motor Starter, Surge Protection ...
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LS power circuit breaker wiring method
The wiring method of the circuit breaker has the front of the board, the back of the board, the plug-in type, the drawer type, if the user has no special requirements, they are supplied according to the front of the board, and the wiring before the board is a common wiring method.
1. Wiring method behind the board: The wiring feature behind the board is that the circuit breaker can be replaced or repaired, without wiring from the beginning.
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The cause of the broken shaft of the motor - LS generates electricity
1. Improper device:
The motor is not concentrious with the equipment being dragged, resulting in excessive radial load on the motor, which eventually leads to metal exhaustion. When the radial load on the extension end of the motor shaft is too large, it will cause the motor shaft to have zigzag deformation in the radial direction. When the motor rotates, the shaft's ...
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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 principle and function of the power production contactor
The working principle of the power production contact is: when the contact coil is energized, the coil current generates a magnetic field, and the generated magnetic field leads the static iron core to produce electromagnetic attraction to the iron core, and drives the AC contact action, the normally closed contact is disconnected, the normally open contact is closed, and the two are connected to each other. When the coil is de-energized, the electric ...
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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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The advantages of the inverter in practical application - LS power generation
With the continuous progress of industrial automation, inverters have also been widely used, energy conservation and environmental protection as the core of China's industrial economy, in the direction of the sustainable development of China's industry, but also useful to promote the sustainable development of China's inverter profession, so that I ...
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The size of the contactor is selected by the type of contactor - LS produces electricity
1. Select the corresponding category of contactor according to the control object, operation times and application category of the contactor.
2. Select according to the rated voltage of the line at the application location.
3. Select the rated current of the main contact of the contactor according to the load capacity.
4. About the voltage level of the lead coil ...
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The power of LS power inverter is selected
The relationship curve between the load rate β and the power η of the inverter can be seen: when β = 50%, η = 94%; When β = 100%, η = 96%. Although the β has doubled, the η change is only 2%, but it is also considerable for medium to high power (a few hundred kilowatts to several thousand kilowatts) electric motors. The system power is equal to the inverter power ...
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The cause of motor burnout caused by the inverter - electricity production
In fact, the fault of the motor is not the cause of the motor itself, most of them are caused by the non-standard debugging of the inverter or the wrong inverter motor when the inverter motor is used, etc., mainly in the following situations:
1. Treat the general motor as a ...
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