Variable Frequency Drive (VFD), also known as a Variable Speed Drive (VSD), is a device that can change the electrical frequency (Hz) of the power supply. It’s commonly used in HVAC systems for controlling the speed of various components such as compressors, pumps, and fans.
Variable Frequency Drive (VFD), also known as a Variable Speed Drive (VSD), is a device that can change the electrical frequency (Hz) of the power supply. It’s commonly used in HVAC systems for controlling the speed of various components such as compressors, pumps, and fans.
VFDs enhance system performance, extend equipment life, and protect against leakages by optimizing pump operations. If you have specific requirements, you can find a suitable VFD for your industrial pumping applications in Danfoss’s wide range of low-voltage AC drives.
Benefits of VFDs in Fans & Pumps applications
Most fans and water pumps are selected according to its full loads working status, but in practice they are not working at the full load state in most of the time. So to control flow & air volume of the pumps & fans, it needs a wind deflector, reflux valve or start/stop timer usually, and the large power ac motors are very difficult in start/stop frequently as the electric impact is in a high level, during this time, it's absolutely will cause electric energy wasted and high current impact during start/stop of the ac motor.
To solve this kind of problem, the most scientific way is to adopt a variable frequency drive to control the fans and water pumps. When the AC motor operates at 80% of its rated rotation speed, in theory, the power consumption is the cube of 80% of its rated power, i.e. 51.2%. Generally, it can almost save 40% power consumption for the manufacturer when deduct the impact of mechanical loss and ac motor copper and iron loss. Plus, it can improve energy-efficient when the fan & pump adopt closed-loop constant-pressure control which can be achieved easily. Due to the VFD drive can realize soft start and soft stop for the ac motors, it can avoid voltage surge during the motor's start period to decrease the failure rate and increase its service life, and reduce the power system's capacity requirements and reactive power loss.
Energy Conservation Analysis
Through the fluid mechanics' basic principles, we know the fans and pumps are belong to square torque loads, the rotation speed n, flow Q, pressure H and shaft power P relation: Q∝n, H∝n2, P∝n3,, i.e., the flow is in proportion to its rotation speed, the pressure is in proportion to the square of its rotation speed, and the shaft power is in proportion to the cube of its rotation speed.
VFD is a product special designed for load with square torque like in fan and water pump applications, cost effective and reliable, it's an ideal choice for your energy saving system.
Wide range operation voltage, fluctuation range in 304 - 456V AC
Special rotation speed tracking technology with no impact
Several V/F curves in setting
Multi-function input/output terminals with Multi-path definable function
Re-start function in instant power off
Built-in RS 485, support MODBUS-RTU communication protocol
Stable start, suitable for high-inertia load's speed regulation
Easy to realize closed-loop automatic operation with advanced built-in PID algorithm
System characteristics after reform
1) Realize AC motor's soft start/stop by adopting VFD control, to increase the equipment's service life and avoid impact on the power system.
2) Control the AC motor's rotation speed by the variable speed drive, remove the damper adjustment to decrease failure rate of the application, and increase electricity saving significantly.
3) The ac motor operates below rated rotation speed, to decrease impact of noises to the environment.
4) Do not affect original power facilities & environment during installation to allow continuous production.
5) Enhance overload, overvoltage, overcurrent, undervoltage and voltage phase lack protection functions, and audible and visual alarm function;
Hot tag: Variable Frequency Drive (VFD) Manufacturers&Suppliers Factory China.