1. As soon as the inverter of the heat exchange station is opened, the pressure transmitter jumps randomly;
2. Use the inverter to control the water supply, the pressure transformer is used as the 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. The voltage transformer (4-20mA) jumps randomly after the LS inverter is started, while the nearby integrated thermal resistance (4-20mA) is not affected, and the signal lines are not shielded;
These phenomena are all due to the disturbance of LS inverters. So why do drives cause disturbance? First of all, we all know that frequency converters are used to change the frequency. The inverter includes a rectifier circuit and an inverter circuit, and the input alternating current is converted into DC voltage through the rectifier circuit and wave circuit, and then the DC voltage is converted into pulse voltage of different widths (called pulse width modulation voltage, PWM) through the inverter. By using this PWM voltage to drive the motor, the motor torque and speed can be adjusted.
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The basic method and steps of inverter debugging - power inverter
1. No-load energizing test of inverter
1. Ground the grounding terminal of the inverter.
2. Connect the power input terminal of the inverter to the power supply through the leakage maintenance switch.
3. Check whether the factory display window of the inverter is normal, if it is incorrect, it should be reset.
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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 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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An internal component of LS's power circuit breaker
1. Auxiliary contact: the contact mechanically linked with the main circuit of the circuit breaker and the closing mechanism is mainly used for the display of the circuit breaker and the closing status, and is connected to the control circuit of the circuit breaker through the opening and closing of the circuit breaker to control or interlock its related electrical appliances. For example, output to signal lights, relays, etc.
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After the contactor is energized, the start button continuously engages and disconnects ?—— LS generates power
What is the reason why the contactor keeps engaging and disconnecting by pressing the start button after the AC contactor is energized?
In my personal opinion, most of the situation is caused by the wrong coil voltage of the replacement AC contactor, or the purchase of ...
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Why can't the inverter be equipped with a leakage protector - power generation
When using an inverter, a leakage maintainer must not be used. This is a major principle of the use of frequency converters.
Some users choose the corresponding leakage maintainer for the inverter when using the inverter. *The result is: the inverter moves together ...
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Inverter life extension method - LS power generation
1. The inverter should not be installed on the equipment with a sensation, because the main circuit connection screw in the inverter is easy to loosen, and many inverters are damaged due to this reason.
2. Wiring problem: the input terminal of the inverter should be connected to a ...
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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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LS power inverter parts replacement and its requirements
The inverter is composed of many electronic parts, such as semiconductor components, etc., in the operation and maintenance involves the replacement of a related component, because of the composition or physical characteristics of the inverter, it will deteriorate in a certain period of time, so it will reduce the characteristics of the inverter, and even ...
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Selection of the color of the conductor of the high and low voltage switchgear - LS power production
1 AC three-phase circuit
a) Yellow for phase A, green for phase B, and red for phase C;
b) Light and blue colors for the neutral line or neutral line;
C) Yellow and green two-color wires are used for safety grounding wires.
2 AC circuits connected by twinax wires or stranded wires: red, black ...
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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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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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The impact of power quality problems on frequency converters - electricity production
(1) Excessive voltage error will increase the loss of electrical equipment, shorten the life, and work abnormally, which will damage the stability of the synchronous operation of the power system, the stability of the voltage and the economic operation of the power grid, and will cause the inverter system to report overvoltage fault or undervoltage fault.
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DC reactor for inverter and design calculation - LS power generation
The DC reactor for the inverter is also called the flat wave reactor, which is connected in series in the DC bus (terminals P1 and P+). The main thing is to reduce the higher harmonic component of the input current and improve the power factor of the input power supply (to 0.95). This reactor can be used at the same time as the AC reactor, and the inverter has high power ...
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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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Types and characteristics of PLC digital output modules for power production
The main functions and functions of PLC:
1. For sequential control: sequential control is based on the current and pre-historical situation of the input switch, and produces the required switching output, so that the system can operate in a certain order. ...
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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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The difference between input reactor and output reactor – LS produces electricity
The rectifier part of the general inverter selects the diode uncontrollable bridge rectifier circuit, and the middle filter part selects the large capacitor as the filter, so the input current of the rectifier is actually the charging current of the capacitor, and the harmonic component is relatively steep and steep.
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Relationship between motion control and frequency converter
Motion control has a significant period characteristic, it is a combination of a variety of high-tech to push industrial automation, office automation and home automation to a higher stage. At present, the motion control is mainly composed of three parts: inverter, motor and controller.
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LS inverter classification
LS Denden's low-voltage inverters provide optimal speed control in a variety of industrial sites, and are solutions that can demonstrate the completion of an automation system and have an epoch-making power saving effect. It includes four types of products: IGXA; S100; IS7; C100 series.
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