Automatic adjustment circuit and automatic adjustment method for phase sequence of three-phase power supply of air conditioner

Abstract

The invention provides an automatic adjustment circuit for the phase sequence of a three-phase power supply of an air conditioner, which comprises an electrical control panel, wherein the first, second and third phases of the three-phase power supply are connected with normally-open contacts of a first alternating current contactor and the detection interfaces of the electrical control panel respectively; the normally-open contacts of the first alternating current contactor are connected with the normally-open contacts of a second alternating current contactor; the interface of a compressor is first connected with the normally-closed contact of the first alternating current contactor and then connected to the normally-closed contact of the second alternating current contactor; and the starting contacts of the first alternating current contactor and the second alternating current contactor are connected to the first and second control interfaces of the electrical control panel respectively. According to the technical scheme, when the electrical control panel detects a phase error of the first, second and third phases of the three-phase powder supply, automatic phase switching is realized by turning off the first alternating current contactor and turning on the second alternating current contactor. Thus, the compressor always works with a correct power supply, a protection effect is achieved and the aim of automatic control is fulfilled.

Description

Technical field: [0001] The invention relates to the technical field of air conditioner control circuits, in particular to an automatic adjustment circuit and adjustment method for phase sequence of three-phase electric power supply of air conditioner. Background technique: [0002] With the development of society, air conditioners are widely used in various buildings, and create a comfortable indoor environment for people by exchanging indoor and outdoor air, and perform functions such as cooling, heating, and air purification. For air conditioners with a larger capacity in some larger places, the current required for power supply is larger. Especially for models with more than three or five horses, because the compressor often works in a high-voltage and high-current environment, it usually uses three-phase power supply, and the compressor must be in the correct phase sequence to work normally. When the phase is wrong, the air conditioner cannot work, and the phase sequen...

AI Technical Summary

Problems solved by technology

For larger air conditioners in larger places, the current required for power supply is larger

Especially for models with more than three or five horses, because the compressor often works in a high-voltage and high-current environment, it usually uses three-phase power supply, and the compressor must be in the correct phase sequence to work normally. When the phase is wrong, the air conditioner cannot work, and the phase sequence needs to be adjusted artificially, which brings great inconvenience to the work of the air conditioner

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