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. 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 due to the disturbance of LS inverters. So why do drives cause disturbance? First of all, we all know that the frequency converter is 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 flat-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 main functions and functions of LS power production PLC
1. For sequential control: sequential control is based on the current and pre-historical conditions of the input switch, and produces the required switching output, so that the system can work in a certain order. This is the basic manipulation of the system. It is also a common manipulation in discrete production processes.
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Introduction of LS AC motors
1. AC synchronous motor: that is, the rotor is composed of permanent magnet data, so after rolling, with the change of the stator rotation magnetic field of the motor, the rotor also changes the speed of the response frequency, and the rotor speed = stator speed, so it is called "synchronization".
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Quickly locate the fault method of switching power supply - LS power generation
Due to the short circuit of the load, the failure of the self-oscillation circuit and the loss of control of the protection circuit, the switching power supply will cause the base of the switch tube to be unable to get the switching pulse and intermittent operation, which makes it difficult to locate the shortcomings of SMPS. The difficulty of the repair operation and the improper method will expand the shortcomings, constituting the phenomenon of continuous burning of the switch pipe, etc., ...
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Introduction to the control method of LS power inverter
Inverter control method: low-voltage general frequency conversion output voltage is 380-650V, output power is 0.75-400kW, operating frequency is 0-400Hz, and its main circuit adopts AC-DC-AC circuit. Its control methods have gone through the following five generations.
1U/f=C sine pulse width modulation ...
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The working principle of the LS power production module
When the LS power generation module is put into operation, its working process is generally divided into three stages: input sampling, user program fulfillment, and output rewriting. The completion of these three phases is called a scan cycle. During the entire operation, the PLC's CPU repeatedly performs the upper ...
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Precautions for the peripheral configuration of the inverter - LS generates electricity
(1) When the inverter is connected to the power grid of large-capacity power transformer (more than 500kVA), perhaps the same power transformer is connected with a thyristor converter without using a commutation reactor, or when there is a switching capacitor bank for power improvement in the same power grid, an AC reactor or DC reactor should be equipped.
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Fault solution for three-phase asynchronous motor - LS power generation
1. The motor cannot roll after being energized, but there is no abnormal noise, no peculiar smell and smoke.
1. Cause of the problem: (1) The power supply is not connected (at least two phases are not connected); (2) Fuse blowing (at least two-phase blowing); (3) The overcurrent relay is adjusted too small; (4) The wiring of the control equipment is faulty.
2. Question ...
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The difference between multi-function and general-purpose inverters
Multi-function inverters need to meet the following two conditions:
First, it can be driven by constant torque load, regardless of the type of machine, and can ensure continuous operation even if the load fluctuates greatly. If the above conditions are not satisfied, the inverter will be easy to stop, difficult to start again, and resistant to ...
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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 choice of inverter power - LS produces electricity
1. The power value of the inverter is the most suitable for the power value of the motor, so as to facilitate the operation of the inverter at a high power value.
2. When the power classification of the inverter is not the same as the power classification of the motor, the power of the inverter should be as much as possible.
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How to operate LS inverters
1. When the power supply is now powered or the inverter is in running condition, 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 move the inverter. Otherwise, you may be shocked by the high-voltage terminals or exposed charging capacitors. ...
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LS Electric has been selected as one of the "Top 100 Global Innovators" for 10 consecutive years.
In Clarivate's recent statement, LS Electric was named one of the top 100 innovators in the world. The trophy handover ceremony was held in Anyang, LS Electric R&D Park, with Kim Yeong-geun, Chief Technical Officer of LS Electric, and Ahn Seong-sik, CEO of Clarivate Korea, acting as representatives of both parties.
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Automatic adjustment of motor parameters - LS power generation
Step 1: If the motor can be completely separated from the load, in the case of a power failure, the motor is mechanically separated from the load, and the motor is allowed to rotate freely without load.
Step 2: After powering on, select the VFD command source (F0-04) as the command channel of the operation panel.
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The meaning of power in LS power inverter
Power refers to the amount of work done by an object in a unit of time, i.e., power is a physical quantity that depicts how fast or slow work is done. The amount of work is constant, and the shorter the moment, the greater the power value. The formula for finding power is power = work/moment. Power is a physical quantity that characterizes the degree of work done fast or slow. Units made in the hour ...
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Precautions for the maintenance of the inverter of the tensile testing machine - LS generates electricity
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 between -10°C and +40 ...
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Practical common sense in the inverter industry - LS inverter
1. The low-voltage fuse cannot be used as an overload maintenance of the motor.
2. The additional voltage of the fuse must be greater than or equal to the operating voltage of the distribution line.
3. The additional current of the fuse must be greater than or equal to the ...
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Faulty failure with soft starter - LS generates electricity
In the use of soft starters, some users often have some wrong concepts:
1. It is believed that whether the motor can be started successfully is related to the function of the soft starter, and a good brand or even a foreign brand should be selected under heavy load.
2. When the motor is not ...
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Advantages of universal inverter - LS produces electricity
Universal inverters are characterized by their versatility. With the development of inverter technology and the continuous expansion of market demand, general-purpose inverters are also developing in two directions: low-cost simple general-purpose LS inverters and high-performance and multi-functional general-purpose inverters. They have the following characteristics:
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Inverter circuit structure - LS generates electricity
The main circuit is the power replacement part of the power supply for the asynchronous motor, and the main circuit of the inverter can be roughly divided into two categories: the voltage type is to change the DC of the voltage source to the communication of the DC port of the inverter, and the filter is the capacitor. The current type is to change the DC of the current source to the communication ...
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The internal accessories component of the power production 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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