1.Overview：

Powder separator is used in dry production grinding system wind classification equipment, its role is to mill materials in the qualified products selected in a timely manner, and its in the new dry cement production line in the coal mill, raw material in the unloading drying mill and cement mill system is widely used. There are many types of powder selecting machine, different types of suitable materials are different, different models are also made according to the customer's requirements for the fineness of the material. Generally, the common powder selecting machine has cyclone type cyclone powder selecting machine, three separation powder selecting machine, centrifugal powder selecting machine, special powder selecting machine for coal mill, special powder selecting machine for calcium powder, etc.

 The traditional powder selecting machine has low productivity, low efficiency, and high efficiency. The traditional powder selecting machine has the shortcomings of low production efficiency, complicated debugging and maintenance, and poor product quality.

With the development of frequency inverter technology and a large number of applications, its excellent performance and significant energy-saving effect to improve the defects of the traditional powder selecting machine, to the industry has brought considerable economic benefits.

2.Implementation plans：

FGI frequency inverters are used in the transportation, dust removal, and material separation drive systems at this site. Due to the heavy load of the powder selecting machine, the load torque will change continuously during the starting and stopping acceleration and deceleration of the motor, and the motor exists in the state of generating electricity, which will generate 

excess energy that needs to be converted away. Aiming at the working characteristics of the powder selector, FGI FD300 series frequency inverter is adopted on site to receive commands from the upper computer and control the rotary motor to drive the fan blade to select materials to meet the process requirements of the powder selector.

3.Application advantage

The system adopts FD300 series frequency inverter to meet the process requirements of the powder selector and realize energy-saving and stable operation of the system.

The low frequency can reach 150% torque output, realizing the powder selector without impact and large torque start, avoiding the impact on the power grid, so that the system loss rate is low, prolonging the mechanical life and operation cycle.

The FD300 series frequency inverter speed control accuracy reaches ±0.1%, and the speed regulation range is wide, realizing the adjustment of motor speed to reach fineness, making the system adjustment convenient, sensitive and reliable, and improving the efficiency and quality of powder selecting.

FD300 frequency converter can provide complete over-current, over-voltage, under-voltage, overload and other protection functions, realizing the all-round protection of the motor. It makes the system run stably and reliably, and is deeply trusted by users.