China Frequency Control Speed/VFD/VSD/VVVF/ Frequency Inverter

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General Introduction


From the above, different voltage output, the quantity of power units is different, but the working theory is exactly identical. All power units receive the indicator from same central process controller. There is a phase difference in secondary windings of transformer which provide energy for power unit, in this way, most of the harmonics current caused by independent power unit will be eliminated, so the primary winding current is approximately sine wave, the harmonics current flowing into power grid are so few, even under the rated load, the harmonics contents is lower of 3%.

 

The power unit is AC-DC-AC structure, equivalent to a low-voltage power source inverter of 3-phase input single-phase output. The rectifier side is diode three-phase full bridge circuit and the IGBT inverter bridge can be controlled through sine PWM mode to output single-phase AC. All power units are fully identical in structure and electrical performance, very easy for maintenance and replacement.

 

Technical Features 

  • Voltage source High-high frequency inverter, it can realize No-step speed regulation, which makes the typical motors into intelligent motors.

  • Low harmonics input and high power factor, the typical value for power factor is 0.95 through whole speed regulation, even more higher, no need for power factor compensation.

  • WLD-HVF output few harmonics, the motor does not generate extra heat and noise.

  • Modularized design of power units, interchangeable and easy to produce and repair, the equipment can find any fault exactly based on advanced diagnostic procedures in MPU.

  • The inverter still can operate even the faults for part of power units exists, if there are faults happen for inverter, the system can switch to power frequency through bypass function.

  • Applicable to all kinds of power grid at home and abroad and suitable for typical high voltage motor.

  • Colorful touch screen, easy to operate and maintenance.

  • Able to realize remote control, DCS operation and communications with Host, and support all kinds of communications interfaces such as CAN, Profibus, Modbus, RS232, RS485 etc.

  • Applied latest components, master control chip adopted TI’s DSP F28335 and ALTERA’s FPGA of EP3C to realize powerful processing capacity; Sampling adopted AD’s AD7606 with 16 bit to ensure control accuracy of the system.

  • The switchgear can satisfy safety requirements, and the pressure-relief channel of high voltage switch can ensure safe use of operators. 

     

Energy Saving Fields

  • Power Generation: Induced draft fan, forced draft fan, condensate pump, feed pump, primary air fan, secondary air fan, booster fan, circulating pump, mill fan, slurry pump etc

  • Cement: draft fan, high-temperature fan, air blower, dust collection fan, grinding machine etc.

  • Metallurgy: blast furnace blower, slurry pump, feed water pump, dust fan, compressor etc.

  • Petroleum&Chemical: Water injection pump, crude oil pump, Compressor, fan, circulation pump, etc

  • Urban water supply: Water delivery pump, water intake pump, water supply pump, sewage treatment industry, self-fractionating pump etc

  • Minerals & Mining: Mud pump, ventilation fan, belt conveyor, slurry pump etc
    Others: Loads such as fan, pump and compressor in pharmaceutical, paper making and wind tunnel test

  • China Frequency Control Speed/VFD/VSD/VVVF/ Frequency Inverter 

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Q:How many types of CVT are classified?
classification: To achieve stepless speed change, according to the transmission can be used liquid drive, power transmission and mechanical transmission in three ways. Liquid drive Liquid drive is divided into two categories: one is hydraulic, mainly by the pump and the motor or composed of valves and pumps composed of variable speed transmission, suitable for small and medium power transmission. The other for the hydraulic, the use of hydraulic coupler or hydraulic torque transmission, suitable for high power (hundreds to thousands of kilowatts). The main features of the liquid drive are: speed range, can absorb the impact and prevent overload, transmission efficiency is high, long life, easy to automate: manufacturing precision requirements, the price is more expensive, the output characteristics of constant torque, Large, easy to run when the oil spill.
Q:Why the notebook power adapter can not be universal
First, the interface is different Most laptop power adapter brands have different interfaces, which means that other brands of power adapters can not be plugged into your laptop for power supply. The interface is relatively safe, because at least you will not plug in the current or voltage does not meet the power adapter to the laptop power supply, which led to computer hardware damage.
Q:The laptop's power adapter is broken how much it costs
Buy a new, new price of dozens to one hundred. Notebook adapter, as long as the output current is greater than the old, the same voltage, with the brand can be interchangeable, Different brands of adapters to meet the above requirements, that is, insert the notebook connector is different, you can use scissors + tape,
Q:Who knows how the frequency converter works
The inverter is actually an inverter, which first turns the alternating current into direct current, and then switches the DC power with the electronic components into AC power, and the inverter is equipped with a variable frequency The frequency is adjustable in a certain range, and it is used to control the number of revolutions of the motor, so that the number of revolutions can be adjusted within a certain range.The frequency converter is widely used in the speed regulation of AC motor. Technology development direction, with the development of power electronics technology, AC frequency conversion technology from theory to practice gradually mature. Inverter not only smooth speed, large range, high efficiency, start current is small, smooth operation, and energy saving effect is obvious. Therefore, the exchange frequency control has gradually replaced the traditional traditional slip speed, variable speed control, DC speed control system, more and more widely used in metallurgy, textile, printing and dyeing, smoke machine production lines and buildings, Water supply and other fields. Generally divided into rectifier circuit, flat wave circuit, control circuit, inverter circuit, and so on several major parts.
Q:What is the frequency of `30 points
AC are frequency, China is 50 Hz, is in a second amplitude of 50 times. To change this frequency, it is necessary to use some electronic components to change the current frequency. General frequency conversion for the tributary motor speed more. So that some equipment can be stepless. Principle, see the first floor just fine, copy the more detailed.
Q:ASUS and dell notebook power adapter can be universal?
One, not necessarily interchangeable. Need to compare the two adapter specifications to determine: 1, the books power adapter, there are 90W and 60W of the other, some products output voltage 19V and 14V of the other. "General" conditions, as long as the output power of the adapter is the same, the output voltage is the same (current may not consider), that is, their specifications are the same, you can directly substitute. 2, however, some foreign imports of products using 110V AC products, be careful to see clearly. 3, before the use of replacement, pay attention to observe if connected to the books of the power plug specifications are different, you can not directly insert. An interface adapter can be purchased. Can also be bad adapter plug, cut into the replacement adapter; Second, for example: 1, LITEON OEM products, parameters: input AC 100 ~ 240V 1.5A, output DC 19V3.42A. Rated output power 60W; 2, ASUS books supporting products, parameters: AC 100 ~ 240V 1.5A, output DC 19V 4.74A. Rated output power 90W.
Q:What is the motor series parameter setting of the inverter? If it is with the spindle,
The motor series setting of the inverter should be set according to the series of motor
Q:Variable frequency conversion frequency difference characteristics based on,
Frequency conversion is better, you can smoothly change the synchronous speed. Change the difference is relatively poor, also known as "energy consumption slip" speed. Synchronous speed unchanged, the slip rate has changed, so the speed changed.
Q:Inverter with 2.2KW 6 pole motor. 1 minute 8 times reversing often burn the motor, how to solve. For the 2 pole 4KW motor is the same.
1. Change to servo drive and servo motor. Should be frequent no problem. 2. Or in the machinery to find a way to let it repeatedly change.
Q:The inverter control power is also the same, the pole is not the same as the motor 6 or 4 pole can be used?
can use. But in the inverter "motor parameters" to be some changes. Such as the number of poles, rated current.

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