A control method for a frequency conversion control cabinet in an m-drag-n intelligent constant-pressure water supply system

Abstract

The invention discloses an M-driving-N type (M converters driving N water pumps) intelligent variable frequency control cabinet, which comprises a PLC (programmable logic controller), and M converters and N intelligent motor protectors connected to the PLC, wherein M is less than or equal to 5 and is more than or equal to 2, and N is less than or equal to 15 and is more than or equal to 3. The invention also discloses a constant-pressure water supply system comprising the variable frequency control cabinet and N water pumps, wherein the M converters are connected to N water pumps and each of the water pumps is only connected to one converter; the N intelligent motor protectors are connected to the N water pumps one by one; and the PLC is used for starting and stopping frequency conversion and power frequency of the water pumps in accordance with the situation on water outlet pressure of the water supply system. The invention also discloses a control method of the variable frequency control cabinet in the constant-pressure water supply system. The variable frequency control cabinet disclosed by the invention has the characteristics that the water pumps are unnecessary to be started frequently and water pressure is stably controlled, and through further setting, the variable frequency control cabinet has the characteristics of networked communication, goofier operation and intelligent operation; and in addition, the variable frequency control cabinet is strong in university and transportability, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to the field of frequency conversion control cabinets, in particular to an M-to-N intelligent frequency conversion control cabinet, a constant-pressure water supply system and a control method. Background technique [0002] With the development of society and the improvement of people's awareness, people pay more and more attention to energy saving and emission reduction, especially in water supply. How to save energy while ensuring constant pressure and stable water supply in the system has become the focus of current research. [0003] Most of the frequency conversion control cabinets on the market use "one drive to N (one frequency converter drives N water pumps)" frequency conversion control cabinets. The so-called "one drive to N" means that one frequency converter can drive N pumps alone. For any one of the water pumps, ensure that one water pump is in the frequency conversion operation state each time. When the water supply...

AI Technical Summary

Problems solved by technology

This will cause the system to work at a high load for a long time. Even when the water consumption becomes very small at night, the pressure on the pipeline will remain at a high level, which will cause a lot of waste of resources.

[0007] The third is that most of the equipment in the frequency conversion control cabinet and constant pressure water supply system on the market is hard-wired, and the internal wiring of the system is complicated. Once a failure occurs, the maintenance cost is high

In addition, due to the lack of a friendly man-machine interface, the operation of on-site equipment and the setting of related parameters can only be done by professionals connected to the PLC through a computer. Maintenance of personnel

[0008] It can be seen that the above-mentioned existing frequency conversion control cabinet, constant pressure water supply system and control method obviously still have inconvenience and defects in structure and use, and need to be further improved urgently.

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