Inverters are used for many different purposes, but the inverter achieved the best performance in control applications stepless motor speed to meet the technological requirements. Depending on the application of variable frequency in different areas that control its performance gives the applications demonstrated in various aspects such as energy efficiency, soft start.

Inverters are used for many different purposes, but the inverter achieved the best performance in control applications stepless motor speed to meet the technological requirements. Depending on the application of variable frequency in different areas that control its performance gives the applications demonstrated in various aspects such as energy efficiency, soft start ...

         Working principle of the inverter is quite simple. First, single-phase AC power or three phase is rectified and filtered DC source. This stage is done by diode bridge rectifier and capacitors (capacitor DC link). Thus, the power factor of the inverter system value does not depend on the load. This voltage is converted (reverse flow) into a three-phase voltage Rotate dimensional symmetry. This stage is now done through IGBT (transistor insulated gate bipolar) by means of adjustable pulse width (PWM). Thanks to advances in technology and microprocessor technologies power semiconductor current switching frequency pulse can be up to ultrasonic frequency range to reduce engine noise and reduce losses in the iron core motors.

 System three-phase AC voltage at the output can change value of amplitude and frequency levels depending on the controller. In theory, the transformation frequency and voltage to follow a certain rules depending on control mode. For constant torque load, the voltage-frequency ratio is constant. However, with the load pump and fan, this law is a function of type 4. Voltage as a function of frequency of type 4. This creates torque characteristics as a function of speed level 2 in accordance with the requirements of the load pump / fan moment by itself is also a function of voltage level 2. Power conversion efficiency of the inverter is very high because of the use of power semiconductor components were built by modern technology. Thus, energy consumption is approximately equal to the energy required by the system. Meets with the increasing demand and the development of industry in the market there are many variable frequency of different companies make diversity.

        Siemens is one of the world's leading manufacturer of equipment used in industry and inverters from Siemens is one of the products are widely used in the factory ... Siemens Inverter variety of categories, capacity, to meet All of your applications from basic to advanced features, from the current capacity of small to very large power lines ...
 NOT SOME TYPE OF INVERTER
        Siemens now has a line of products is quite familiar with the market, such as G110, MM420, MM430, MM440.
        With MM430 inverter product line with very large capacity range is designed for use in pumps, fans with features PID control hierarchy. Achieving high performance in specific applications that save energy, significantly reduce costs for the plant.
        MICROMASTER next parallel line (MM420, MM430, MM440), Siemens Inverter SINAMICS Development Series (G110, G120, G130, G150)
        Current line G110 inverter Sinamic quite familiar with people, is widely used in industry as well as civil.
 
       Currently Siemens has introduced a new product line G120 inverter Sinamic meet maximum demand of customers. G120 Sinamic modular format is designed to meet All of the chemical complex applications, for users to add more choices, lower costs and consistent with the need to use as well as your desired features.
APPLICATION AND FUNCTION OF DRIVES
        Control functions stratification that due to the PID controller with variable speed control motors at up to 04 (an engine run frequency of the voltage inverter, three remaining engine run frequency voltage grid) Thanks to this feature you can easily upgrade the system load and engine rotation chosen to run with variable frequency in order to improve life for the engine, in addition enables easier maintenance and ensuring system continuous system operation.
Anti-idling function: Users can install a number of parameters (P2189, P2190, P2187, P2188, P2185, P2186) to monitor the engine torque range thereby detect overload or low load, the damage engineering such as fault lines, it is not pumping water ... For timely error and stopping the system, maximum protection for the plant's system. Besides the basic features on the LG inverter also quite strong in the media or the USS Profibuss
        When we use on an inverter system in addition to the basic features on Inverter also bring the effort:
          1. Inverter working on the principle of frequency change (along with the voltage change) should always ensure enough starting torque overload even at very low speed. Meanwhile, the electric current to the motor does not increase, due to coordination between the voltage and frequency to keep from birth through enough torque. Maximum starting current of variable frequency drives with just the norm. So do not drop the net on boot, make sure other applications are not affected.
          2. By the boot process should soften the details of the mechanical drive systems such as conveyors, couplings, bearings, bearings in the system will be less prone to wear out or break. The more washers, the pressure meter or flow, ... placed on the pipeline will ensure long life. Therefore, the cost of system maintenance is greatly reduced.
          3. Power factor cos (φ) is always kept at 0.96. This ensures that the grid is a high-efficiency and reduce costs for system reactive power compensation.
          4. Ensure continuous control modes, absolute conformity with the demands of technology on the flow and pressure. This increases the quality of the process.
          5. Ability to create automated systems, thanks to the integrated built-in PID for closed-loop control; interface with automation systems available on the 485 frequency converter makes it possible to control coupling and transmission far from easy.

Tran Quoc Trieu
Total Automation Electrical Technology  Co., Ltd
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