CN102969943A

CN102969943A - Motor automatic control device

Info

Publication number: CN102969943A
Application number: CN2012103444077A
Authority: CN
Inventors: 谯兴宇; 何仕贵; 陈强; 刘正祥
Original assignee: Dazhou Electric Power Bureau Of Sichuan Electric Power Co; State Grid Corp of China SGCC
Current assignee: Dazhou Electric Power Bureau Of Sichuan Electric Power Co; State Grid Corp of China SGCC
Priority date: 2012-02-24
Filing date: 2012-09-18
Publication date: 2013-03-13
Also published as: CN102545727A

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

Motor automatic control device

Technical field

The present invention relates to motor operation automatic control equipment, particularly utilize electro connecting pressure gauge when oil gas pressurization motor load reaches setting, power to realize the control device of motor automatic start-stop by the conversion between three contacts of this Pressure gauge.

Background technology

Oil gas adds Medium-voltage Motor and overheating operation occurs and can cause motor overheating, thereby shortens electrical machinery life.Simultaneously, be connected to barometric three electric contacts of electric contact in the pipeline, because energising is long time of contact, often can causes and emit arc, cause the damage of electric contact (being the contact).

Summary of the invention

The purpose of this invention is to provide a kind of overtemperature autostop, the barometric electric contact of electric contact instantaneous charged motor automatic control device only in the motor shutdown process.

The object of the present invention is achieved like this:: a kind of motor automatic control device, comprise motor YD, the main contacts of contactor JC and thermal relay RJA all is connected in the current supply circuit of motor YD, electric contact air gauge YX, it is anodal that the contact P of described electric contact air gauge YX is connected to direct current 24V, and the contact P1 of electric contact air gauge YX is connected to direct current 24V negative pole after being connected in series in turn the first normally-closed contact JC1 of contactor JC and the first auxiliary relay 1ZJ;

The contact P2 of electric contact air gauge YX is connected to direct current 24V negative pole after being connected in series in turn the first normally opened contact JC2 of contactor JC and the second auxiliary relay 2ZJ;

The normally opened contact 1ZJ2 of the first auxiliary relay is connected in series button TA in turn, and contactor JC behind the normally-closed contact 2ZJ1 of the second auxiliary relay and the normally-closed contact RJ of described thermal relay RJA, is connected in the 380V current supply circuit;

The second normally opened contact JC3 of contactor JC is connected in the 380V current supply circuit after being connected in series in turn thermal relay RJA and pressurization indicator light HD;

After the second normally-closed contact JC4 of contactor JC is connected in series halt indicator LD in turn, be connected in the 380V current supply circuit;

Dead electricity indicator light LD1 is connected in the 380V current supply circuit.

The 3rd normally opened contact JC5 that also has test button QA and contactor JC; The two is parallel with one another for the 3rd normally opened contact JC5 of test button QA and contactor JC, and one after the two parallel connection is terminated at phase line, and the other end after the two parallel connection is connected to the normally opened contact 1ZJ2 of the first auxiliary relay 1ZJ and the node of button TA.

The present invention utilizes automatic equipment transfer contact under external force, makes its middle transfer contact P, P1, P2 auto-closing, disconnection control the automatic startup of electric machinery equipment, stop in the scope of setting.This control device increases by 2 24V(or other electric pressure) DC electronic relay (being auxiliary relay) 1ZJ, 2ZJ, utilize their intermediate conversion closings of contact, disconnect the actuating coil of control contactor JC, realize the operation principle of automatic starting and stopping motor.

The present invention has following characteristics and advantage:

1, utilize electronics auxiliary relay 1ZJ, 2ZJ coil to connect precision instrument work loop, the electrification time that flows through its P of electric contact, P1, P2 is short, by intermediate contact switch operating electric current, and the electric current of stream P, P1, P2 is little, the contact does not emit arc, be difficult for sticking, prolonged such transfer contact useful life.

2, this automatics automatically stable, reliability is high.

3, this device only connects turnover active line and three control lines that oil gas adds Medium-voltage Motor, wiring is simple, and is easy to utilize, utilizes electrical interlocks principle contactor to disconnect the actuating coil of corresponding electronic relay when starting and stopping, not fragile, working life is longer.

4, applied range is such as the automatic starting of the equipment such as factory's numerical-control motor, automatic water pumping equipment, Self-pressurizing agri motor with stop.

5, the present invention be specially adapted to all kinds separate unit motor startup, stop (equipment for using a pair of normally opened contact and normally-closed contact then becomes normally opened contact to the normally-closed contact changing-over, uses this control cabinet not to be affected).Special in the electric contact equipment of precision instrument class, the relay class less such as dry-reed relay, electro connecting pressure gauge and contact capacity, as use the alarm integrated control cabinet of New-type electric machine can reduce to flow through the electric current of corresponding contacts, the contact does not emit arc, be difficult for sticking, prolonged the useful life of such device contact, the stability that improved electric motor starting, stops.This device is integrated in the control cabinet, install wiring simple, be convenient to promote.This device provides foundation for manufacturer production design, and investment for trnasforming urban land is little, designs further hommization, and is convenient for installation and maintenance, and it is more reasonable to use.

Description of drawings

Fig. 1 is circuit theory diagrams of the present invention.

Embodiment

Fig. 1 illustrates, this motor automatic control device, comprise motor YD, the main contacts of the main contacts of contactor JC and thermal relay RJA all is connected to (by three phase line A1, B1 and C1 power supply) in the current supply circuit of motor YD, electric contact air gauge YX, it is anodal that the contact P of electric contact air gauge YX is connected to direct current 24V, and the contact P1 of electric contact air gauge YX is connected to direct current 24V negative pole after being connected in series in turn the first normally-closed contact JC1 of contactor JC and the first auxiliary relay 1ZJ; The contact P2 of electric contact air gauge YX is connected to direct current 24V negative pole after being connected in series in turn the first normally opened contact JC2 of contactor JC and the second auxiliary relay 2ZJ; The normally opened contact 1ZJ2 of the first auxiliary relay is connected in series button TA in turn, contactor JC, behind the normally-closed contact 2ZJ1 of the second auxiliary relay and the normally-closed contact RJ of described thermal relay RJA, be connected in the 380V current supply circuit (namely be connected between phase line A1 and the phase line C1, lower with); The second normally opened contact JC3 of contactor JC is connected in the 380V current supply circuit after being connected in series in turn thermal relay RJA and pressurization indicator light HD; After the second normally-closed contact JC4 of contactor JC is connected in series halt indicator LD in turn, be connected in the 380V current supply circuit; Dead electricity indicator light LD1 is connected in the 380V current supply circuit.The 3rd normally opened contact JC5 that also has test button QA and contactor JC; The two is parallel with one another for the 3rd normally opened contact JC5 of test button QA and contactor JC, and one after the two parallel connection is terminated at phase line, and the other end after the two parallel connection is connected to the normally opened contact 1ZJ2 of the first auxiliary relay 1ZJ and the node of button TA.Among Fig. 1, be serially connected with contactor main contacts JC0(among triple line A1, B1, the C1 between each phase line and the motor and often open) and thermal relay main contacts RJ0(normally closed).

This device capital equipment comprises:

1, comprehensive protector of motor or open one of circuit breaker according to the suitable plastics sky of work drive motor Capacity Selection;

2, according to respectively one of the suitable contactor of oil gas pressurization Selection of motor capacity, thermal relay;

3,24V(or adopt as required the relevant voltage grade) two of electronics auxiliary relays;

4, power source special is one, is equipped with electronic relay and uses.5, pressurization indication, shutdown indication, three indicator lights of dead electricity indication, the startup-shutdown test button.

Operation principle of the present invention: when the contact P of electric contact air gauge YX and P1 connect, the 24V electric current consists of the work loop through actuating coil and contactor JC the first normally-closed contact JC1 of the first auxiliary relay 1ZJ, the normally opened contact 1ZJ2 of the first auxiliary relay 1ZJ is closed, electric current is by the 1ZJ2 closing contact, button TA, contactor coil JC, the normally-closed contact 2ZJ1 of the second auxiliary relay 2ZJ, thermal relay normally closed contact RJ consists of the 380V path, contactor JC action, connect working power, electric motor starting, begin pressurization, in contactor work, contactor JC normally-closed contact JC1 disconnects, electric contact air gauge P1 dead electricity, the work of pressurization indicator light.Same principle, when the barometric air pressure of electric contact reaches setting (contact P and contact P2 on-state), the 24V electric current consists of the work loop through actuating coil and contactor JC the second normally opened contact JC2 of the second auxiliary relay 2ZJ, the normally-closed contact 2ZJ1 of the second auxiliary relay 2ZJ disconnects, contactor coil JC dead electricity, contactor JC action, disconnect working power, motor stops, automatically stop pressurization, in the out-of-work while of contactor, contactor JC the first normally opened contact JC2 disconnects, electric contact air gauge P2 dead electricity.When equipment fault causes over current of motor, motor protective circuit breaker disconnects working power, the indication of dead electricity indicator light indication halt indicator.Just crossing and starting and stopped process, electric contact P1, P2 are that moment is charged, and change through the electronics auxiliary relay, when P respectively with P1, when P2 contacts, pick-up current all very little, do not emit arc, and connecing normally closed through contactor and normally opened contact JC1, JC2 conversion, not charged when P disconnects with P1, P2 respectively, improved the barometric stability of electric contact and useful life.

Claims

1. motor automatic control device, comprise, motor YD, the main contacts of contactor JC and thermal relay RJA all is connected in the current supply circuit of motor YD, electric contact air gauge YX, it is characterized in that it is anodal that the contact P of described electric contact air gauge YX is connected to direct current 24V, the contact P1 of electric contact air gauge YX is connected to direct current 24V negative pole after being connected in series in turn the first normally-closed contact JC1 of contactor JC and the first auxiliary relay 1ZJ;

2. motor automatic control device according to claim 1 is characterized in that, also has the 3rd normally opened contact JC5 of test button QA and contactor JC; The two is parallel with one another for the 3rd normally opened contact JC5 of test button QA and contactor JC, and one after the two parallel connection is terminated at the 380V phase line, and the other end after the two parallel connection is connected to the normally opened contact 1ZJ2 of the first auxiliary relay 1ZJ and the node of button TA.