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General Variable Frequency Drive

Brief Introduction
The general variable frequency drive (VFD) is the electrical control equipment utilizing the frequency conversion technology and microelectronic technology to control the AC motor via changing the frequency of working power of motor. It is basically composed of rectifier (AC to DC), smoothing unit, inverter (DC to AC), brake unit, driving unit, detecting unit, microprocessing unit, etc.

The equipment adjusts the voltage and frequency of the output power via the breaking of internal IGBT (insulated gate bipolar transistor), and provides the required power supply voltage accoridng to the actual need of motor, thus reaching the purpose of energy saving and speed adjusting. In addition, the general VFD has many protection functions such as overcurrent protection, overvoltage protection, overload protection, etc. With the continuous improvement of industrial automation, it has a very wide range of application.

Functions and Features
1. The product adopts the SVC current vector control mode, and is optional with V/F control mode.
2. It is configured flexibly with multi-node setting for V/F curve.
3. The equipment is also avilable with motor parameters static self-turning function.
4. It is outfitted with the multifunctional programmable input port, allowing for programming relay output.
5. The general variable frequency drive is built with PID regulator internally which is conveniently for customers to carry out simple closed loop control involving flow, pressure, etc.
6. The overcurrent and overvoltage monitoring protection can protect the product and the equipment of customers to the fullest extent.
7. The product takes advantages of the unique adaptive control technology and pulse width modulation technology to obtain the optimum control performance.
8. Designed with compact structure and small volume, it has dependable peformance.
9. The product adapts to the large range wide power grid change design, especially the special occasions with low voltage.

Application
The general variable frequency drive is alrgely applied into the fields concerning machinery, textile, printing and dyeing, packaging, printing, ceramics, pharmacy, food, production line, etc.

Specification
Item Standard specification
Input Input voltage Single phase 220V, three-phase 380V, 50Hz/60Hz
Allowable variable value Voltage: -20% ~ +20%
Voltage unbalance rate: <3%
Output Rated voltage 0 ~ 220V/0 ~ 380V
Frequency range 0Hz ~ 400Hz
Motor Applicable motor power 0.4kW ~ 630kW (0.5HP ~ 840HP)
Control function Modulation mode Optimizing space voltage vector PWM
Control mode Sensorless vector control
Frequency accuracy Digital setting: Maximum frequency × ±0. 01
Analog setting: Maximum frequency × ±0.2%
Frequency resolution Digital setting: 0.01Hz
Analog setting: Maximum frequency × 0.1%
Torque boost Automatic torque boost, manual torque boost 1%~30.0% (V/F Mode)
V/F curve Linear V/F curve, square V/F curve, User defined V/F curve
Built-in PID It facilitates forming closed loop control system, and is suitable for pressure and flow control.
Multi-speed operation Achieving multi-speed operation via built-in PLC or control terminal
Sensorless vector control Torque characteristic Outputting 150% rated torque at 1Hz, rotating speed stabilization accuracy of 0.1%
Motor parameter automatic reading Indentifying motor parameters automatically in the case of the motor stopping running completely to get optimum control effect
Running function Running command channel Presetting via operating panel, presetting via control terminal, presetting via serial port (The three ways can be switched.)
Frequency setting channel Presetting via keyboard potentiometer, presetting via ▲ and ▼ keys on the keyboard, presetting via functional code digits, presetting via serial port. Presetting via terminal UP/DOWN, presetting via analog signal, presetting via combination
Switch input channel Forward and reverse rotating command, 6-way programmable switching value input to set at most 30 kinds of functions
Analog input channel 2-way analog signal input optional with 0 to 20mA and 0 to 10V
Analog output channel Analog signal output optional with 0 to 10V and 0 to 20mA
Switching value output channel 3-way programmable open collector output, 1-way relay output signal
Operating panel LED digital display Displaying preset frequency, output voltage, output current, etc.
Protection function Overcurrent protection, overvoltage protection, undervoltage protection, overheating protection, overload protection, etc.

Related Names
Frequency Converter Supplier | Frequency Motor Control | Industrial Control Device

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