Industrial Frequency Inverter
The concepts of "integrity, excellency, and mutual-benefit" enable Longchi to establish a long-term partnership with distributors from more than 50 countries. The annual sales volume amounts to 530 million.
- Product Introduction
Company Profile
The originator of Longchi technology has rooted in the field of solar energy as early as in 1990s. Longchi factory was founded in 2011, occupies 56667 square meter and is located at the center of the Yangtze River Delta-Huzhou,Zhejiang.
Longchi is the forerunner of off-grid solar energy system and home energy storage solutions in China, aiming to improve the energy supply situation especially in rural areas. With strong R&D, reliable quality, and strict supply chain management, Longchi products have been testified for peak performance and long life. The concepts of "integrity, excellency, and mutual-benefit" enable Longchi to establish a long-term partnership with distributors from more than 50 countries. The annual sales volume amounts to 530 million.
Why Choose Us
High quality
Our products are manufactured or executed to very high standards, using the finest materials and manufacturing processes.
Quality control
We have professional personnel to monitor the production process, inspect the products and ensure that the final product meets the required quality level standards, guidelines and specifications.
Delivery speed
We have huge production capacity to ensure on-time delivery and transportation to the destination as soon as possible.
24h online service
We try and respond to all concerns within 24 hours and our teams are always at your disposal in case of any emergencies.
What is Industrial Frequency Inverter?
Industrial Industrial Frequency Inverteris the application of frequency inversion technology and microelectronics technology, by changing the frequency of the motor operating power supply to control the AC motor power control equipment.
A Industrial Frequency Inverter, also known as an AC frequency converter or AC speed regulator, is a kind of electronic equipment, used to control the speed of the motor, realize energy saving, and precise control, and improve the degree of industrial automation. Industrial Frequency Inverters are widely used in various industrial sectors such as manufacturing, construction, water treatment and mining. The different types of Industrial Frequency Inverters fulfill the needs of different applications.
Frequency Industrial Frequency Inverter
Adjustable torque limit
After adjusting the speed by frequency conversion, the corresponding torque limit can be set to protect the machine from damage, so as to ensure the continuity of the process and the reliability of the product. At present, the frequency conversion technology makes not only the torque limit adjustable, but also the control accuracy of the torque reach about 3%-5%. In the power frequency state, the motor can only be controlled by detecting the current value or thermal protection, but can not be operated by setting the precise torque value as in the frequency conversion control.
Controllable stopping mode
Like controllable acceleration, the stopping mode can be controlled in the frequency control system and different stopping modes can be selected (decelerated parking, free parking, decelerated parking + DC braking). Similarly, it can reduce the impact on mechanical components and motors, thus making the whole system more reliable and prolonging the service life accordingly.
Energy-saving
The energy saving of Industrial Frequency Inverteris mainly manifested in the application of fans and pumps. In order to ensure the reliability of production, all kinds of manufacturing machine have a certain amount of surplus when they are designed and equipped with power drive. When the motor fails to run under full load, it may not meet the requirements of power drive or excess torque increases the consumption of active power, resulting in waste of electrical energy. For traditional equipment such as fans and pumps, the frequency control method is to adjust the air supply and water supply by adjusting the baffle and valve opening at the inlet or outlet, where has a large input power, and a large amount of energy is consumed in the process of closure by the baffle and valve. In the use of frequently control, when the flow requirement is decreased, the frequency control can be achieved by reducing the speed of the pump or fan.
Reversible operation control
In the control of frequency inverter, there is no need for additional reversible control devices to realize reversible operation control, just change the phase sequence of output voltage, which can reduce maintenance costs and save installation space.
Reduce mechanical transmission components
At present, vector control converter plus synchronous motor can achieve high-efficient torque output, thus saving mechanical transmission components, such as gearboxes, and ultimately constituting a direct frequency conversion drive system. Thus, the cost and space can be reduced and the stability can be improved.
General Frequency Converter: It refers to the Industrial Industrial Frequency Inverterthat can be used with ordinary cage-type asynchronous motor, can adapt to various loads of different nature, and has a variety of optional functions.
High-performance Dedicated Industrial Frequency Inverter: High-performance dedicated inverter is mainly used in the system with higher requirements for motor control. Compared with general-purpose inverters, most of the high-performance dedicated inverters adopt vector control mode, and the driving object is usually the special motor specified by the inverter manufacturer.
High-Industrial Frequency Inverter: In ultra-precision machining and high-performance machinery, high-speed motors are often used. In order to meet the driving requirements of these high-speed motors, high-Industrial Frequency Inverters adopting the PAM (Pulse Amplitude Modulation) control mode have appeared, and the output frequency of the Industrial Industrial Frequency Invertercan reach 3kHz.
IGBT Industrial Frequency Inverter: IGBT Industrial Frequency Inverters use insulated gate bipolar transistors (IGBTs) as power-switching devices. IGBTs have high voltage tolerance and high switching speeds, making inverters ideal for high-power applications. IGBT frequency converters can achieve efficient power conversion and are widely used in industrial drives and motor control.
MOSFET Industrial Frequency Inverters: MOSFET frequency converters use metal-oxide-semiconductor field-effect transistors as the power-switching device.MOSFETs have low on-resistance and fast switching characteristics, which makes them suitable for some applications that require high-frequency switching. These frequency converters are typically used in low-power applications and high-frequency applications.
Different Applications and Industries for Frequency Converters
We will discuss frequency inverters with several pumping application examples. Although there are many uses for frequency inverters in the pumping environment, they usually fall into three basic categories -- constant pressure, constant flow, and variable flow. There are, of course, other ways to maintain these conditions (control valves for example) but the Industrial Frequency Inverteroffers an extra bonus -- a significant reduction in power consumptio
It's an electrical device that converts one frequency to another. They help regulate speeds of motors that drive a pump or ran. The two most common types of converters are the solid-state converter and rotary converter.
Each type of frequency converter is used for several different applications within several different industries. Let's dive deeper into what that looks like:
Research Labs and Universities
Universities, research facilities and government-related labs all require frequency converters. It's essential that labs have clean, uninterrupted power. This can be in the form of a rotary frequency converter, solid state frequency converter or power line isolators.
A rotary converter will be used for larger applications, while solid is used for smaller applications. And while a rotary can be noisy, a solid can run quietly. These differences are considered for the industries and applications for frequency converters.
Aquatic, Aircraft, Space
Power converters can serve clients within the avionic and marine industries. Starting at 400 Hz, expanding into rotary and solid-state models, the converter will supply these large applications with clean and reliable sources of power.
Thanks to frequency converters, several different industries benefit from their applications and uses. Without these important converters, power glitches, expensive manufacturing and more trouble shooting would result. Thankfully, converters provide industries with consistent power and proper function.
Components of Industrial Frequency Inverter
The rectifier
Because it is difficult to change the frequency of an AC sine wave while in the AC mode, the first job of a frequency converter is to convert the wave to DC. As you will see a little later, it is relatively easy to manipulate DC in order to make it look like AC.
The rectifier circuit converts AC to DC and does so in much the same manner as those of a battery charger or arc welder. It uses a diode bridge to limit the travel of the AC sine wave to one direction only. The result is a fully rectified AC wave form that is interpreted by a DC circuit as a native DC wave form. Three phase frequency converters accept three separate AC input phases and convert them to a single DC output. Most three phase frequency converters can also accept single phase (230V or 460V) power but, since there are only two incoming legs, the frequency converters output (HP) must be derated because the DC current produced is reduced proportionally. On the other hand, true single phase frequency converters (those that control single phase motors) utilize a single phase input and produce a DC output that is proportional to the input.
The DC bus
The second component, known as the DC Bus is not seen and in all frequency converters because it does not contribute directly to variable frequency operation. But, it will always be there in high quality, general purpose frequency converters (those manufactured by dedicated frequency converter manufacturers). Without getting into a lot of detail, the DC Bus uses capacitors and an inductor to filter the AC "ripple" voltage from the converted DC before it enters the inverter section. It can also include filters which impede harmonic distortion that can feed back into the power source supplying the frequency converter. Older frequency converters and some pump specific frequency converters require separate line filters to accomplish this task.
Theinverter
The inverter uses three sets of high speed switching transistors to create DC "pulses" that emulate all three phases of the AC sine wave. These pulses not only dictate the voltage of the wave but also its frequency. The term inverter or inversion means "reversal" and simply refers to the up and down motion of the generated wave form. The modern frequency converter inverter uses a technique known as "Pulse Width Modulation" (PWM) to regulate voltage and frequency. We will cover this in more detail when we look at the output of the inverter.
Inverter output
The inverter output consists of a series of rectangular pulses with a fixed height and adjustable width. In this particular case there are three sets of pulses -- a wide set in the middle and a narrow set at the beginning and end of both the positive and negative portions of the AC cycle. The sum of the areas of the pulses equals the effective voltage of a true AC wave (we will discuss effective voltage in a few minutes). If you were to chop off the portions of the pulses above (or below) the true AC wave and use them to fill in the blank spaces under the curve, you would find that they match almost perfectly. It is in this manner that a frequency converter controls the voltage going to the motor.
The sum of the width of the pulses and the blank spaces between them determines the frequency of the wave (hence PWM or pulse width modulation) seen by the motor. If the pulse was continuous (i.e. no blank spaces), the frequency would still be correct but the voltage would be much greater than that of the true AC sine wave. Depending upon the desired voltage and frequency, the frequency converter will vary the height and width of the pulse and the width of the blank spaces in between. Although the internals that accomplish this are relatively complex, the result is elegantly simple!
Effective voltage
AC power is a rather complex quantity and it is no wonder that Edison almost won the battle to make DC the standard in the US. Fortunately, for us, all of its complexities have been explained and all we have to do is follow the rules those before us have laid out.
If you were to measure the heat produced by a DC current flowing through a resistance, you would find that it is greater than that produced by an equivalent AC current. This is due to the fact that AC does not maintain a constant value throughout its cycle. If you did this in the laboratory, under controlled conditions, and found that a particular DC current generated a heat rise of 100 deg, its AC equivalent would produce a 70.7 deg rise or just 70.7% of the DC value. Therefore the effective value of AC is 70.7% of that of DC. It also turns out that the effective value of an AC voltage is equal to the square root of the sum of the squares of the voltage across the first half of the curve. If the peak voltage is 1 and you were to measure each of the individual voltages from 0 deg to 180 deg, the effective voltage would be 0.707 of the peak voltage. 0.707 times the peak voltage of 170 seen in the illustration equals 120V.
Technical setup of a frequency inverter
An electronic Industrial Frequency Inverterconsists of a rectifier, which supplies a so-called 'intermediate DC current', and an inverter which acts upon it. This allows the current supplied to be converted to a specified voltage.
Designs/types
- Volt-Herz frequency inverter
This is technically the simplest type of frequency inverter. In this case the voltage and the frequency control follows a linear relationship. If a Volt-Herz Industrial Frequency Inverteris used for motor control, there are certain dependencies. The load on the motor directly affects the resultant usable speed. Where the range of speed variance is not large, or if there is no direct starting load, a Volt-Herz Industrial Frequency Invertercan be used for motor control.
- Vector-controlled frequency inverter
A vector-controlled Industrial Frequency Inverterdoes not control an AC motor using a voltage/frequency ratio, but by varying the motor input frequency and voltage. An advantage of this method is optimum torque control. Vector-controlled frequency inverters offer other advantages too. For example, three-phase motors are able to make direct high-speed starts, and speeds adjustments can be more closely controlled.
Special features
Frequency inverters offering real parametric control are more than 95 per cent efficient. Many manufacturers develop high-quality electronic frequency inverters and adapt their general functions to particular applications. With LED indicators, control panels and programmable frequency inverters, many parameters and functions – such as start and stop ramps – can be effectively consumer-controlled. By standardizing individual modules frequency inverters can be integrated as a modular building blocks in existing SPS systems, or likewise accessed via serial interfaces or additional analog outputs. Installation and wiring are thus completed faster, thanks to this modular approach and the resultant design improvements.
Industrial frequency inverter working process
Parameter Setting: Before starting the inverter, it is necessary to set its parameters. These parameters include the rated power, rated voltage, and rated current of the motor. The setting of parameters directly affects the output performance of the inverter.
Input Power: The Industrial Frequency Inverterreceives AC power through the input rectifier and converts it to DC power. The intermediate DC link smoothes the DC power to ensure the stability of the power supply.
Inverter Output: The Industrial Frequency Inverterconverts DC power to adjustable frequency AC power and outputs it to the motor. Through the control of the inverter, precise adjustment of the motor speed can be realized.
Control System Adjustment: The control system adjusts the inverter output according to the real-time monitored parameters such as current, voltage, and speed. The closed-loop control system can make the motor run stably under different loads and working conditions.
Real-time Feedback: The control system of the inverter can provide real-time feedback on the running status of the motor, and ensure that the motor runs according to the predetermined speed and torque through monitoring and adjustment.
Industrial industrial frequency invertermaintenance
In inverter regular inspection, we must cut off power before operation. Wait 4minutes (the bigger the longer, the maximum waiting time is 15 minutes) till the Industrial Industrial Frequency Inverterdisplay panel LED indicator lights turn off, to make the main circuit DC filter capacitor fully discharged, and measure with a multimeter to confirm before proceeding.
Detach control board and main circuit from the Industrial Frequency Inverter, clean the inverter circuit board and internal IGBT modules, input and output chokes and other parts with brush and dust cleaner. Use cotton swab with alcohol or neutral chemical to clean PCB dirty place.
Check the inverter inner wire insulation has overheating traces, corrosion and discoloration or not, if found out, we should handle or replace it in time.
As the Industrial Industrial Frequency Inverterhas vibration, temperature changes and other effects, screws maybe loose, we should tighten all screws.
Check input and output chokes, transformers, etc. is overheating, discoloration or smelly.
Check the intermediate circuit filter electrolytic capacitor safe valve is bulging out or not, and the outer surface has cracks, leakage, swelling and so on. Generally, the inverter filter capacitor life cycle of about five years, the inspection intervals is one year. The capacity of the capacitor can be measured by digital capacitance measurement, when the capacity drops to 80% rated capacity or less, it should be replaced.
Check the cooling fan operation is in good condition or not. The cooling fan lifetime is limited by bearings, we should replace the cooling fan or bearings in 2-3 years. If there are abnormal sounds and vibration, we need to replace in time.
Check the Industrial Industrial Frequency Inverterinsulation resistance is in the normal range or not (all terminals with ground terminals). Note, do not use the megger to measure the circuit board, otherwise it will damage the circuit board electronic components.
Disconnect the inverter R, S, T terminals with power supply, and U, V, W terminals with motor cable, measure the insulation resistance between each phase conductor and each phase conductor with the protective ground terminals with the megger, to see if it's in normal value or not, generally its higher than 1MΩ.
After inspection, we should use Industrial Industrial Frequency Inverterdrive the motor with no load for a few minutes, and check the motor rotation direction.
Certifications
FAQ
Hot Tags: industrial frequency inverter, China industrial frequency inverter manufacturers, suppliers, factory, universal inverter, inverter for security systems, inverter for heating
