The quality of the control circuit determines the function of the LS inverter.
The function of the DC central circuit is to smooth the output of the rectifier circuit to ensure that the inverter circuit and the control power supply can obtain a high-quality DC power supply. When the rectifier circuit is the voltage source, the primary component of the DC central circuit is a large-capacity electrolytic capacitor, and when the rectifier circuit is the current source, the lubrication circuit is mainly composed of a large-capacity inductor. In addition, due to the need for motor actuation, braking resistors and other auxiliary circuits are sometimes included in the DC center circuit.
The inverter circuit is one of the most important parts of the LS inverter. Its primary function is to convert the DC power output of the lubricating circuit into an AC power supply with arbitrary adjustable frequency and voltage under the control of the control circuit. The output of the inverter circuit is the output of the LS inverter, which is used to realize the speed control of the asynchronous motor.
The control circuit of LS inverter includes several parts, such as the main control circuit, signal detection circuit, gate (base) drive circuit, external interface circuit and maintenance circuit, which is also the core part of the inverter. The quality of the control circuit determines the quality of the function of the inverter.
The primary function of the control circuit is to send various signals obtained by the detection circuit to the operation circuit, so that the operation circuit can supply the necessary gate (base) driving signal for the main circuit of the inverter according to the requirements, and provide the necessary maintenance for the LS inverter and the asynchronous motor. In addition, the control circuit also receives/transmits various forms of external signals and gives the internal working conditions of the system through external interface circuits such as A/D, D/A, etc., so that the inverter can cooperate with external equipment for various high-performance controls.
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LS inverter frequency conversion mode
1. The operator panel is given The operator panel is a simple frequency setting method of the inverter, and the user can directly change the set rate of the inverter through the potentiometer, digital key or rising and descending keys on the inverter operator panel. The big advantage of the operator panel is that it is simple ...
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The advantages of the inverter in practical application - LS power generation
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Introduction to the matching of LS power inverter loads
1. Square torque load
Fan and pump loads are the most widely used equipment in industrial sites, and frequency converters are used in this type of load. It is a square torque load. In general, inverters with U/f=const control mode can be satisfied with the ...
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LS power converter interference phenomenon
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. Pressure transformer (4-20 ...
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GMC-6 Contactor GMC-6 Rated voltage: 110V/22OV/380V;
GMC-9 Contactor GMC-9 Rated voltage: 110V/22OV/380V;
GMC-12 Contactor GMC-12 Rated voltage: 110V/22OV/380V;
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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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LS power terminal is faulty
From the perspective of application, the function of the terminal block should be achieved: the contact part should be conducted, and the contact should be reliable. The insulating parts should not be conducted, and it is necessary to insulate them firmly. There are three common forms of fatal failure of terminal blocks:
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The inverter selects the appropriate peripheral equipment - LS power generation
After we have selected a suitable Variable-frequency Drive (VFD), we also need to consider whether we need to equip other peripheral equipment according to the actual situation of the site. The peripheral equipment selected by VFD mainly includes circuit breakers, reactors, contactors, braking resistors, etc.
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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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Inverter overvoltage alarm analysis - LS power generation
Change the shutdown mode to inertia parking and you're done! In this way, after the fan is stopped, the inverter will immediately turn off the output, so that the fan can stop freely, at this time, although the fan is in the power generation situation, but the electricity generated by the fan will not pass through the inverter of the inverter to generate direct current, so the inverter will not overvoltage ...
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LS Electric reached a strategic cooperation with Nandu Power Supply and Changzhou Kunlan
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1. Method 1
Method 1: Fourier transform to obtain the amplitude and phase of each harmonic of voltage and current, calculate the active power of each harmonic according to P=√3UIcosφ, and add the active power of all harmonics to obtain the harmonic power.
Method 2: Measure the total active work ...
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Cycloidal reducer transmission system testing - LS power production
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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:
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