The inverter is the power frequency power supply (50Hz or 60Hz) converted into various frequencies of AC power supply to achieve the variable speed operation of the motor equipment, by changing the motor power frequency to achieve speed adjustment, is an ideal high-efficiency, high-speed regulation means. The application of inverter in industrial production and residents' life is becoming more and more extensive, and it is very necessary to understand and master the practical knowledge of the inverter industry.
1. The colors of the three-phase five-wire system are yellow, green, red and light blue, which represent the double color (PE) of the protective grounding wire of U, V, W and N respectively
2. In the system of power supply of the same transformer, it is not suitable to mix protection grounding and protection connection.
3. The rated voltage of the secondary coil of the voltage transformer is generally 100V.
4. The secondary side of the voltage transformer shall not be short-circuited when working. Because a large short-circuit current will be generated in the event of a short circuit, the transformer may be burned out, so fuses are installed on the primary and secondary sides of the voltage transformer for protection.
5. One end of the secondary side of the voltage transformer must be grounded. This is to prevent the primary and secondary coil insulation breakdown, the primary high voltage into the secondary side, endangering the safety of personnel and equipment.
6. The secondary side of the current transformer is close to the short circuit condition when it is working. The rated current of the secondary coil is generally 5A
7. The secondary side of the current transformer is never allowed to open the circuit when working.
8. One end of the secondary side of the current transformer must be grounded to prevent the primary side from entering the secondary side with high voltage when the insulation of the primary and secondary coils is broken down.
9. During installation, it must be noted that the wiring is correct and reliable, and the secondary side is not allowed to connect the fuse or switch. Even if for some reason the instrument or other device on the secondary side is to be removed, the secondary side must be shorted before it is removed.
10. When connecting the equipment: connect the equipment first, then connect the power supply.
When disassembling the device: disassemble the power supply first, and then disassemble the device.
When connecting the line: connect the zero line first, then connect the live wire.
When dismantling the line: dismantle the fire line first, and then dismantle the zero line.
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Asynchronous motor with inverter - LS generates electricity
Before the asynchronous motor is equipped with an inverter, let's take a look at the three major types of mechanical equipment loads:
1. Constant torque load: such as conveyor belts and mixers; When the inverter drags a load of constant torque nature, the torque at low speed should be large enough and the overload capacity should be large enough. If you need ...
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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 cause of motor burnout caused by inverter - LS generates electricity
In fact, the problems of the motor are 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 due to the following situations:
1. Put the general motor ...
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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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Advantages and disadvantages of LS inverter non-sensing vector control
The first generation of LS inverter selects the voltage frequency ratio scalar control method, which carries out frequency conversion speed regulation according to the linear ratio determined by the equivalent circuit of the asynchronous motor. Voltage refers to the effective value of the fundamental wave, and changing U/f can only regulate the steady-state magnetic flux and torque of the motor, not to mention dynamic control. In order to improve the low ...
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Introduction to the output frequency of the inverter - LS power generation
1. Maximum frequency fmax, reference frequency fN and reference voltage UN
2. The upper frequency fH and the lower frequency fL
The output frequency of the inverter is limited to the upper and lower limit frequencies to prevent errors in the event of misoperation.
3. Frequency of activation
When the signal ON is activated, the ON ...
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The reason for the overload trip of the inverter - LS generates electricity
1. The load is too heavy, the load carried by the motor is too heavy, or in other words, the resistance torque of the production machinery exceeds the additional torque of the motor.
2. Use improper overload, for example, increase the operating frequency of the inverter to the extra frequency of the motor, and the motor is in the extra frequency.
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Inverter circuit board repair and drawing-free maintenance method - LS power generation
1. Be "confident"
It is necessary to fully understand the principles of some typical circuits and be familiar with them. Guangzhou Kewo Training Center believes that drawings are dead, and the thoughts in the head are alive, able to make analogies, able to reason, and able to touch analogies. For example, switching power supply is always inseparable from ...
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Inverter maintenance principle analysis and inspection method
Principle analysis is the most fundamental way to eliminate the problem, when other methods are difficult to see the effect, you can start from the basic principle of the circuit, step by step to view, and finally find out the cause of the problem. To use this method, it is necessary to have a clear understanding of the principle of the circuit, and to grasp the various ...
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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 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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Reasonable selection of LS inverter
The selection of the inverter should be considered according to the type of controlled object, speed regulation scale, static speed accuracy, starting torque, etc., so that it is easy to use and economical together with the satisfaction of process and production requirements.
1. Inverter and the motor to be operated
(1) The number of poles of the motor. General motor ...
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How does the interference of the frequency converter occur? -- Electricity production
To discuss the disturbance problem of LS inverter, we must first understand the operating principle of inverter, from the structural point of view, inverter is divided into direct inverter and direct inverter. The direct inverter is a communication that directly converts the I frequency current into a controllable frequency, and there is no intermediate DC link. Each phase of it ...
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Features of LS SUSOL series circuit breakers
Features of SUSOL series circuit breakers:
It can be used as the main switch of electrical equipment, and the limit breaking ability is high, Icu=Ics
Modular construction of circuit breakers: Tripper replacement (TS series) can be combined in a variety of combinations, such as ...
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The touch screen controls the inverter steps
1. The touch screen is controlled by PLC inverter
1. At present, the general control of the inverter needs to use PLC to communicate with the inverter, read the information of the inverter, and then the touch screen communicates with the PLC in order to complete the control of the inverter to start, stop, and monitor the operation of the inverter.
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Communication control of inverter - power inverter
The communication control of the inverter is more complicated, so it is listed separately.
The communication control of the inverter is a control method for the operation, speed regulation and status indication of the inverter through the communication interface of the inverter.
...
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Introduction to wiring problems - LS power generation
1. Wiring of fire emergency lighting
Generally, the flame retardant wire is used to wear the metal pipe and the thickness of the protective layer is ≥ 30mm.
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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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Parameter setting of LS power inverter
The inverter is a high-tech intelligent product, in order to let it complete the specified control mission, it must be set parameters, otherwise, it is like the computer is not installed and used, and it cannot be operated normally. The parameter setting is carried out by the control surface of the inverter. All kinds of inverters ...
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Dealing with the "transient" fault method of DP slave - LS power generation
Due to poor contact of network connectors, or due to disturbance and other problems, DP networks that have been used for a long time may show a "transient disconnection" situation, that is, occasionally disconnected instantaneously, and quickly recover to normal. If OB86 is not downloaded, the CPU will stop during a transient outage. Now all over the option to download a ...
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