Inverter is a device that controls and changes alternating current from one current to another. Simply said, the inverter is a device used to control alternating current.
WHAT IS VARIABLE?
Inverter is a device that controls and changes alternating current from one current to another. Simply said, the inverter is a device used to control alternating current.
OPERATION PRINCIPLES OF VARIABLES
The inverter is also quite simple and not very difficult for those who are new to experience for the first time. First, we use 1-phase or 3-phase alternating current to be rectified and filtered into a 1-dimensional flat source. This stage is done by diode bridge rectifier and capacitor. Thus, the cosphi power factor of the inverter system has a value regardless of the load and has a value of at least 0.96. This DC voltage is converted (inverter) into a symmetrical 3-phase AC voltage. This stage is now done through IGBT (bipolar gate with isolated gate) by pulse width modulation (PWM) method. Thanks to the advancement of microprocessor technology and current semiconductor technology, pulse switching frequency can reach ultrasonic frequency range to reduce engine noise and reduce losses on engine iron core.
The 3-phase AC voltage system at the output can change the amplitude and frequency values depending on the controller. In theory, between frequency and voltage there is a certain rule depending on the control mode. For constant torque loads, the voltage-frequency ratio is constant. However, with pump and fan loads, this rule is a fourth order. Voltage is a quadratic function of frequency. This creates the torque characteristic that is the quadratic function of the speed in accordance with the requirements of the pump / fan load because the torque itself is also the quadratic function of the voltage.
The power conversion efficiency of the frequency converters is very high because the use of power semiconductor components is made according to modern technology. Thus, energy consumption is approximately equal to the energy required by the system.
In addition, today's inverter has integrated many different control types suitable for most different types of loads. Today the inverter has a built-in PID and is suitable for many different communication standards, very suitable for control and monitoring in SCADA system.
Free firmware update runs depending on the application.
The same inverter can run many different applications by updating the firmware for free.
Can exceed 1 level of power for light loads on the same inverter.
Automatically adjust the continuous slip compensation factor according to the engine temperature.
Open-loop or closed-loop vector control for precise speed adjustment, large torque Mo-ment, precise position control
Allows open-loop vector control at high frequencies for magnetic induction motor (Servo-PM motor).
Fast response of current and limit voltage improves the continuous operation of the inverter.
Fast braking characteristics reduce installation costs and require external brake resistor installation.
Optional communication network for all industry communications standards, providing high-speed control and operational monitoring, reducing installation costs.
Converterwork software and simple parameter settings. You can use the mobile phone to set parameters for the inverter
The tool "USB Copy Unit" and the keyboard set up for quick and convenient installation of multiple inverters at a time.
The Terminal Board can be disassembled with parameter storage for convenient backup.
Manufactured by materials according to RoHS standards.
Built-in DC Reator up to 30kW to reduce input harmonics.
The KEB function allows the drive to control power loss, operating continuously when instantaneous power is lost.
Extension device:
Support standard RS422 / 485 communication (default), Multi Enthernet, Profibus - DP, CANopen, Digital input / output module, Expansion Relay Card.
Harmonic filters and improved AC power, one-way
* Application:
Used for lifting and moving cranes
Pump motor, blower, packing machine, conveyor, plastic extruder, air compressor, weaving machine, milling machine, shearing machine ....
Author: Ngo Phan