380V 22KW Variable Speed Drive 3Phase VFD Inverter For Motor Pump

Benefits of VFD/VSD

Tighter Process Control with Variable Speed Drives

No other AC motor control method compares to variable speed drives when it comes to accurate process control. Full-voltage (across the line) starters can only run the motor at full speed, and soft starts and reduced voltage soft starters can only gradually ramp the motor up to full speed, and back down to shutoff. Variable speed drives, on the other hand, can be programmed to run the motor at a precise speed, to stop at a precise position, or to apply a specific amount of torque.

In fact, modern AC variable speed drives are very close to DC drives in terms of fast torque response and speed accuracy. AC motors, however, are much more reliable and affordable than DC motors, making them far more prevalent.

Most drives used in the field utilize Volts/Hertz type control, which means they provide open-loop operation. These drives are unable to retrieve feedback from the process, but are sufficient for the majority of Variable Speed Drive applications. Many open-loop variable speed drives do offer slip compensation though, which enables the drive to measure its output current and estimate the difference in actual speed and the setpoint (the programmed input value). The drive will then automatically adjust itself towards the setpoint based on this estimation.

Most variable torque drives have PID capability for fan and pump applications, which allows the drive to hold the setpoint based on actual feedback from the process, rather than relying on an estimation. A transducer or transmitter is used to detect process variables such as pressure levels, liquid flow rate, air flow rate, or liquid level. Then the signal is sent to a PLC, which communicates the feedback from the process to the drive. The variable Speed Drive uses this continual feedback to adjust itself to hold the setpoint.

High levels of accuracy for other applications can also be achieved through drives that offer closed-loop operation. Closed-loop operation can be accomplished with either a field-oriented vector drive, or a sensorless vector drive. The field-oriented vector drive obtains process feedback from an encoder, which measures and transmits to the drive the speed and/or rate of the process, such as a conveyor, machine tool, or extruder. The drive then adjusts itself accordingly to sustain the programmed speed, rate, torque, and/or position.

Product advantages

1. Energy saving

2. Soft starter

3. Machines operating protection

4. Automation control

5. Enhance the production efficiency

VFD application range: Fans, Blowers, Turbines, Blast furnace, Water Pumps, Oil pumps, Plastic extruders, Granulating machine, Industrial production lines, Industrial washing machines, CNC machine, Spinning frame, Roving frame, Dyeing and printing machinery, Escalator, Medium requirement applications, Crane application, Metal cutting machine...

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