Motor automatic control device

Abstract

Provided is a motor automatic control device. A contactor and a main contact of a thermal relay are both connected in a motor power supply loop. A normally opened contact of a first intermediate relay, a press button TA, the contactor, a normally closed contact of a second intermediate relay and the thermal relay are sequentially connected in the 380V of power supply loop in series. A second normally opened contact of the contactor, the thermal relay and a pressurized indicator lamp are sequentially connected in the 380V of power supply loop in series. A second normally closed contact of the contactor and a shutdown indicator lamp are connected in the 380V of power supply loop in series. A power-loss indicator lamp is connected in the 380V of power supply loop. A contact P of an electric contact air pressure gauge is connected with +24V, and a contact P1 is sequentially connected with a first normally closed contact of the contactor and the first intermediate relay in series and then connected with -24V. A contact P2 of the electric contact air pressure gauge is sequentially connected with a first normally closed contact of the contactor and the second intermediate relay in series and then connected with -24V. The motor automatic control device has the advantages that over-temperature automatic shutdown is achieved, the contacts of the electric contact air pressure gauge are instantaneous electrified, and the service life is long.

Description

technical field [0001] The invention relates to an automatic control device for motor operation, in particular to a control device that uses an electric contact pressure gauge to automatically start and stop the motor by switching power supply between three contacts of the pressure gauge when the load of the oil-gas pressurized motor reaches a specified value. Background technique [0002] Overheating of the oil-air pressurized motor can cause the motor to overheat and shorten the life of the motor. At the same time, the three electrical contacts of the electric contact barometer connected in the pipeline often cause arcing due to the long time of energized contact, resulting in damage to the electrical contacts (that is, contacts). Contents of the invention [0003] The purpose of the present invention is to provide an automatic motor control device that automatically shuts down when over-temperature, and the electric contact of the electric contact barometer is charged o...

AI Technical Summary

Problems solved by technology

[0002] Overheating of the oil-air pressurized motor will cause the motor to overheat, thereby shortening the life of the motor

At the same time, the three electrical contacts of the electric contact barometer connected in the pipeline often cause arcing due to the long time of energized contact, resulting in damage to the electrical contacts (that is, contacts)

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