The Application of VB VFD in Air Conditioning System

1.Industrial Background编辑

Central air conditioning system is an indispensable and important component in modern buildings. With the improvement of people's living standards and the acceleration of urbanization, the application of central air conditioning systems is becoming more and more widespread, and the market size is increasing year by year. In the past decade, the application scope of central air conditioning systems has continued to expand, not only in traditional commercial and industrial fields, but also in residential, medical, transportation and other fields. Energy saving, environmental protection, comfort and safety have become the main technical features of central air conditioning systems.

2.User Requirements编辑

With the continuous advancement of technology, the energy efficiency ratio and performance coefficient of central air conditioning systems continue to improve, which has also made a significant contribution to energy conservation and emission reduction.

However, there are currently some pain points in central air conditioning system technology:

1) Energy saving: How to reduce energy consumption and improve energy utilization efficiency is the top priority of the current central air conditioning system.

2) Intelligence: How to use intelligent technology to realize automatic control and remote monitoring of the central air-conditioning system to maximize user satisfaction?

3) Diversification: How to make different types of central air conditioners cope with different usage scenarios to meet the needs of users?

4) Safety: How to strengthen the safety performance of central air conditioning and improve the safety, reliability and stability of the system?

3.Solution编辑

The refrigeration principle of the central air-conditioning system is liquid vapor refrigeration, which achieves refrigeration by removing part of the vapor. The high-temperature gas increases the temperature of the water, condenses into liquid, and then evaporates into low-temperature gas, continuously circulating to achieve refrigeration. The heating principle is that the compressor inhales low-pressure gas and compresses it into high-temperature gas, increases the water temperature through the heat exchanger, and then condenses it into a liquid. The liquid enters the evaporator and evaporates into low-temperature gas, which is continuously circulated to deliver hot water to the room that needs heating to achieve heating.

System schematic diagram

图片1.png

VB VFD can achieve various purposes such as energy saving, improving system stability, safety and intelligence by automatically adjusting refrigeration pumps, cooling pumps and other equipment in central air-conditioning systems.

Electrical control diagram

图片2.png

 Parameter Settings

ParameterDescriptionSet ValueRemarks
F0.01Start & Stop Order Source1DI Terminal
F0.03Main Frequency Source X3AI2
F0.04Auxiliary Frequency Source Y0Keypad
F0.07Frequency Calculation Option02Switchover between X & Y
F0.18Acceleration Time30.030S
F0.19Deceleration Time30.030S
F5.00DI1 Option01FWD Run
F5.01DI2 Option18Switch Frequency Source
F5.02DI3 Option20Switch Start & Stop Order Source
F5.23AI2 Maximum Input2.0AI2-4ma
F6.15AO1 Coefficient20.0AO1 Output 4~20mA
F6.18AO1 Gain0.8

4. Specific Effect Presentation编辑

In the case application, VB VFD demonstrated multiple effects.

First, it has significant economic and energy-saving advantages. Through microcomputer control, the system can automatically adjust the temperature of the end air duct to achieve automated operation. The coils can be turned off even when no one is using them, further saving energy.

Secondly, the application of VB high-performance VFD makes the equipment start and stop more quickly and stably, and has the advantages of large starting torque and small impact on the power grid. This provides more efficient and reliable guarantee for long-term operation.

In addition, it has overload, overcurrent, overvoltage, phase loss and other protection functions, which can greatly improve the safety of the system. This enables the system to protect itself promptly and effectively in the face of various possible problems, further ensuring the stability and reliability of the system.

Finally, VB’s optimized programmable DI terminal allows the VFD to easily cope with the requirements of various occasions. It also provides greater flexibility for practical applications. Users can customize settings and operations according to actual needs to meet various application scenarios.

5. Photos at Site编辑

图片3.png

图片4.png

图片5.png

图片6.png


Engineering Video and Machine Pictures