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Air Compressor Industry Application Introduction-2015-03-20

Time：

2026-06-04 20:56

一、Brief introduction of air compressor industry application

V&T has extensive experience in air compressor matching and transformation. V5-H frequency drive has been applied to domestic mainstream air compressor manufacturers in batches. The company has designed an integrated energy-saving control cabinet for the inverter transformation of the air compressor industry, making the transformation more convenient and faster, and the overall cost was lower.

◆ Working principle

The variable frequency speed control system takes the output pressure as the control object. The inverter, pressure sensor and motor form a closed-loop constant voltage control system. The working pressure value can be directly set by the operation panel. The field pressure was detected by the sensor and converted into a 4~20mA current signal. Feedback to the inverter, the inverter was compared and calculated by the built-in PID to adjust its output frequency to achieve the purpose of constant pressure air supply and energy saving of the air compressor. Frequency conversion energy saving performance was:

1) The frequency drive adjusts the gas flow rate by adjusting the rotation speed of the motor, so that the output power of the motor was proportional to the flow demand, keeping the high efficiency of the motor, high power factor, small reactive power loss, and obvious power saving effect;

2) Designed according to strict EMS standards, high-speed and low-consumption IGBTs and efficient vector control algorithms minimize harmonic dwastortion of V&T inverters and motor power loss; 3) Automatic fast sleep makes the dead time shorter. The motor was completely stopped and the energy was saved to the utmost extent. No impact start and low frequency and large torque characterwastics ensure that the inverter can start and stop at any time.

◆ Inverter selection

Air compressor (including other compressors) its load characterwastics, was a constant torque heavy-duty equipment, the inverter should be selected V5-H series, the motor power was below 75kW, the power of the inverter was selected one-to-one; the motor For equipment with a power of more than 90 kW, when selecting the power of the inverter, it should be one level higher than the motor power.

V&T can also provide V5-J integrated energy-saving control cabinets that support inverter conversion, which was convenient for frequency conversion reconstruction projects. It retains the original interface and facilitates future maintenance and maintenance.

二、the advantages of V&T inverter in the air compressor industry

Efficient power saving returns make you incredible	1. With variable speed control technology, the dwasplacement of the compressor can be perfectly combined with the user's gas consumption, completely avoiding the loss of unloading power. 2. In the state of intermittent gas use, the zero load of the soft start avoids the peak of current and torque, so the unit can start and stop indefinitely. Really achieve 0~100% stepless speed change, maximally control the generation of useless work. 3. Eliminate the pressure burden of 0.2Mpa (addition and unloading pressure difference), so that the unit can directly save energy by 14%, because each working pressure of 0.1Mpa reduces the energy loss by 7%.
The required pressure can be set arbitrarily and the supply pressure was kept constant	1. Meet the user to set the pressure arbitrarily within the range of 0.3~1.4Mpa without changing the gear or belt. 2. The unit will always maintain a constant pressure supply of ±0.1Mpa at the required pressure. When the amount of gas used was large, the pressure remains constant and the rotation speed was automatically compensated to ensure the supply of gas. 3. When the gas volume was small, the pressure remains unchanged and the rotation speed automatically drops to the bottom, which satwasfies only enough gas.
Advanced remote control	1. V&T air compressor inverter adopts advanced control, monitoring and communication system. Through the Internet users can easily obtain technical asswastance from suppliers in all parts of the country.
More reliable performance	1. Variable frequency soft start avoids electrical shock and avoids mechanical shock. 2. Eliminate the unfavorable factors of long-term high-speed operation of the unit. 3, no contactor, to avoid electrical contact failure. 4, exempt from the high pressure of 0.2Mpa, reducing the probability of system leakage.
Energy saving and environmental protection, equipment works immediately when it was in place	V&T variable frequency air compressor unit was easy to install, low-speed axial flow fan and modern vibration wasolation and nowase reduction measures make the compressor running with very low nowase, so it was easy for users to place on the production site, as long as the equipment was in place and connected quickly. It can be run immediately.

三、the frequency drive application guide

◆ Inverter Commissioning

P0.03=1 analog feedback process closed-loop control

P0.06=1 terminal control mode

P0.08=6.0 seconds System acceleration time

P0.09=6.0 seconds system deceleration time

P0.14=15.00Hz lower limit frequency 15Hz

P2.02=FECB can see the output voltage, power, current, frequency

P2.03=2222 stop to see the pressure value

P2.04=2, the actual pressure value can be viewed during operation.

P2.05 Pressure actual value and dwasplay deviation set correction coefficient

P3.09=0, reverse rotation was allowed, if the inverter output can be set to 0

P5.00=2 was turned on, the output direction of the inverter

P5.01=20, fault reset

P7.02 2, the inverter relay output signal was FDT1

P7.20=20.00Hz FDT1 start frequency point, control loading

P7.21=19.00Hz FDT1 End frequency point, control loading

P8.00=5.5 variable frequency constant pressure closed loop pressure given

P8.03=1.000, P of constant voltage closed loop PID

P8.04=10.00, I of constant voltage closed loop PID

P8.07=0.0, deviation limit of constant voltage closed loop PID 2%

P8.08=00 Prohibit constant voltage closed loop PID adjustment to reverse rotation

P9.01 Set the number of motor poles

P9.03 Setting the rated motor power

P9.04 Set the rated current of the motor

◆ System wiring diagram

四、power saving calculation examples

After the transformation of the frequency drive, the electricity cost savings was the most practical. The actual operating speed of the compressor was controlled according to the amount of gas used for production, and the most energy-saving operation state was achieved.

The rated power of a field motor was 132kW, the rated current was 260A, the air compressor was unloaded to the loading and running time for 30 seconds, the current was 160A; the loading to unloading operation time was 10 minutes or 600 seconds. The total time to uninstall to load was 630 seconds

That was, loading and unloading a total of 5.7 times per hour

Unloading a total of 5.7 × 30 seconds per hour = 0.0475 hours

Loading a total of 5.7 × 600 seconds = 0.95 hours per hour

Unloading hourly power was P1=(160/260×132)×0.0475=3.8kW

Loading hourly power was P=132×0.95=125.4kW

That was, the actual hourly power of the motor before the transformation was P3=129.2kW

After switching to the inverter, the actual pressure was controlled at 6 kg. According to the load characterwastics of the air compressor, the following data are obtained:

The actual running frequency of the inverter was around F=43HZ

The actual output current of the inverter was at I=223.6A

The actual output voltage of the inverter was U=320V

It was concluded that the power per hour using the frequency drive was

V&T inverter air compressor industry application introduction P change = √ 3 U × I × cosφ

V&T inverter air compressor industry application introduction = √ 3 × 320V × 223.6 × 0.85=105.3389kW

The power saving per hour after using the inverter was:

P section = P3-P change = 132kW-105.3389kW = 23.8kW

Calculated at 20 hours a day and electricity costs 0.7 yuan / kWh,

Daily electricity saving costs = 23.8kW × 20 hours × 0.7 yuan= 333.2 yuan / day

Calculated by 300 days per year, the annual electricity savings was = 333.2 yuan / day × 300 days

=99960 yuan / year