L200 in Air Compressor Load

Introduction:

At present, China is the largest developing country in the world, and its dependence on natural resources accounts for more than 60%. The energy problem is a serious challenge, especially in recent years, coal shortage and electricity shortage have seriously restricted the development of the national economy. During the peak period of electricity consumption, many production enterprises and departments had to switch off and limit electricity. There are two ways to fundamentally solve the energy problem: one is open source, and the other is energy saving. Frequency conversion energy-saving technology is aimed at that power frequency load is not the best working frequency and load of all electrical equipment, which leads to many equipment being in low efficiency for a long time, with wide application, quick effect and short payback period. At present, it has been widely used in metallurgy, mining, petroleum, chemical industry, medicine, textile, machinery, electric power, building materials, papermaking, printing, water supply, air conditioning and other industries.

1. Brief description of working principle of air compressor:

Take the screw air compressor as an example to illustrate the working principle of the air compressor. The working process of the screw air compressor is divided into four processes: suction, sealing and conveying, compression, and exhaust. When the screw rotates in the housing, the screw and the tooth groove of the housing mesh with each other, and the air is sucked in from the air inlet because the tooth groove meshing surface rotates to seal the sucked gas and deliver it to the exhaust port.

the use of frequency converter can be changed by changing the screw rotor speed to change the displacement, when the amount of gas changes, the frequency converter to change the speed of the way to adjust the displacement of the air compressor, to achieve a constant exhaust pressure, and the purpose of saving energy.

2. Energy-saving principle and effect:
Since the air compressor is basically a constant torque load, adjusting the air supply by means of frequency conversion can make the output power of the motor basically proportional to the speed (air supply), and achieve a good power saving effect.

We use the L200 series inverter with vector control function, which can make the motor provide the torque required by the load at low speed. At the same time, the automatic energy-saving mode of the Demi-controlled inverter can make the motor run with the minimum current under the load torque requirement, and achieve better power saving effect.

frequency conversion transformation programme design schematic diagram:

During normal air supply: air demand-pipeline air pressure-difference between pressure set value and feedback value-PID output-inverter output frequency-air compressor motor speed-air supply flow-pipeline air pressure tends to be stable.

When frequency conversion fails: frequency converter-frequency converter output contactor KM1 is opened-bypass contactor KM2 is closed-air compressor mains operation

3. Reference parameter setting