SU1224937A1 - Device for controlling electric motor - Google Patents

Abstract

The invention makes it possible to increase the reliability of a motor control device. When voltage is applied, time relay 11 is triggered through pins 3, 19 and 20. Contact 12 is closed and prepares the circuit for switching on starter 5. Pressing button 1 energizes relay 2, contacts 3,4, 15 and 16 are switched. Starter 5 closes the main contacts in the motor circuit, pins 7 and 17 and opens contacts 9 and 19. The motor is rotated in the Forward direction. When the second and third button I is pressed, the corresponding contacts of the relay 2 are closed, the second starter 6 is prepared and turned on, and the motor executes the Stop and Back commands. By the fourth pressing of the button 1, the winding of the second actuator 6 is de-energized, the corresponding contacts of the relay 2 and 14 operate and the electric motor is turned off. When you first press button 1, the entire work process is repeated. Reliability is ensured by the fact that the device allows the on-line switching of the actuator without time delay. 1 il. 1 (lu 1C NU from 00

Description

The invention relates to electrical engineering and can be used in electric drives.

The aim of the invention is to increase the reliability of the device.

The drawing shows schematically a device for controlling an electric motor.

The device contains a control button I connected in series with the winding of the first intermittent 2, accurate relay 2 5 first and second switching contacts 3 and 4 of which are connected to the windings of the first 5 and second 5 starters, respectively, the main contacts of which are included in the power supply circuit of the electric motor 5a saNDJKaromjie the block contacts 7 and 8 are connected to the closing parts of the switching contacts 1–1 of contacts 3 and 4 of the first relay. The opening blocking contact 9 of the first circuit 5 is connected in series with the winding of the second actuator 6, and the blocking contact 10 of the second start is disconnected: atel 6 in series with the winding of the first actuator 5. The device also contains an open-circuit relay with a release 5 of the winding, of which II connected in series with its 5 aa azp ayush, their contact 12,

The second 13 and the third 34 relays are entered into the device, and the first relay 2 is made with additional contacts 15 and 16, the first 5 and second connectors with an additional 3 a1–1 C 17.18 and disconnecting 19 and 20 6noK-KOHTaKTa. each, while the winding of the second re. 13 is connected with a series of first interrupting breakers 15 of the first relay 2 and an additional one for. the auxiliary contact 17 of the first actuator .5 ,, 1-mounted g. The closing cock-up 21 of the second relay 13 and the disconnecting contact 22 of the third relay 14, the winding of which is connected to the second additional p.: L.-; ..e 2 .shunted closing contact 23 of the third relay 14 n with additional closing contact block 18 of the second starter 6, General winding point of the time relay 11 SI of its contact terminal 12 through the breaker and shorting part of the power switch contact 24 of the second relay 13 is connected with ra - in lots

9372

respectively the first 3 and second

4 switching contacts of the first relay 2, the second terminal of the winding of the time relay 11 is connected with series-connected additional disconnecting block contacts 19 and 20 of the first 5 and second 6 starters.

The device works as follows

When the supply voltage is applied through the disconnection, the thawing parts of contacts 3 and 24, and the opening of contacts 19 and 20, the winding of the time relay 115 is energized, it works and closes the contact 12 and prepares the circuit for turning on the first actuator 5. When you first press the button 1, the winding the first relay 2, which, having worked, switches contacts 3,4

and opens the contacts 15 and 16, closes the power supply circuit of the winding of the first start-up 5 (contacts 12,24,3 and 10), the actuator 5 closes the main contacts (not shown) in the motor circuit, the block contacts 7 and 17 and opens the block contacts 9 and 39, Produced by DITS. I rotate the motor in the Forward direction, shut down the closing part of contact 3, prepare the circuit to turn on the second relay 13 and break the power supply circuits of the windings of the second starter 6 and time relay 11.

If the button does not return to its original position after the time delay has elapsed, contact 12 is opened and the winding of the switch 5 is de-energized. Run Forward command - push,

If the button 1 is released after the first press, then the relay 2 de-energizes and its contacts 3,4,15 and 16 before the opening of contact 12 of the time relay returns to its original position,

At the same time, the supply circuits of the winding of the first actuator 5 (contacts 3.7, 10) and the winding of the second relay 13 (contacts 15, 7 and 22) are formed, which, having operated, will close contact 2 and switch contact 24. 12 time relay 11. Forward command is executed.

The second pressing of the button 1 triggers the first relay 2, switches the contacts 3.4 and opens the contacts 15 and 16, Winding the first starter

5 is unlocked, open it

the main contacts and the auxiliary contacts 7, 17 and the auxiliary contacts 9 and 19 are closed. The motor turns off,.

After releasing the button 1, the first relay 2 de-energizes and its contacts 3,4,15 and 16 return to their original position. At the same time, through the opening part of contact 4, the closing part of contact 24 (closed, as well as the second relay 13 is turned on) and the opening contacts 19 and 20 energizes the winding of time relay 11, which closes contact 12 and prepares the circuit to turn on the second starter 6. Execute is the stop command.

When the button 1 is pressed for the third time, the first relay 2 triggers, switches contacts 3.4 and opens contacts 15 and 16. Through contacts 12,24,4 and 9 the second starter 6 turns on, closes the main contacts in the motor circuit, block contacts 8,18 and opens the auxiliary contacts 10 and 20. Rotation is performed backward, shunting from the closing part of contact 4, the circuit is prepared for switching on the third relay 14 and the supply circuits of the windings of the first actuator 5 and the time relay 11 are open.

If button 1 does not return to its original position after the time delay has elapsed, contact 12 is opened and the coil of starter 6 de-energizes, the command Back-push is executed.

If after the third push the button 15 is released, then the relay 2 de-energizes and its contacts 3,4,15 and 16 before opening the contact 12 of the time relay 11 returns to its original position. At the same time, the supply circuits of the winding of the second actuator 6 (contacts 4.8.9) and the windings of the third relay 14 (contacts 16 and 18) are formed, which, having actuated, opens contact 22 and closes contact 23, contacts 16 are bridged and the supply winding of the second winds relay 13. Relay 13 is de-energized, its contacts 21 and 24 return to their original position. When the time delay expires, contact 12 of the time relay opens. Executes the Back command.

With the fourth pressing of the button 1, the first relay 2 operates, switches contacts 3,4 and opens contacts 15 and 16. The winding of the second starts-up 6 de-energizes, opens 249374

its main contacts and the auxiliary contacts are 8.18 and the auxiliary contacts 10 and 20 are closed. The coil of the third relay 14 is de-energized, which opens the contact 23 and closes the contact 22. The motor switches off.

After releasing the button 1, the relay 2 de-energizes, its contacts 3,4,15 and 16 return to their original position. At that, winding relay 11 is energized through the disconnecting parts of contacts 3 and 24 and disconnecting contacts 19 and 20. Contact 12 is closed and the circuit is prepared for switching on the first actuator 5. When the button 1 is pressed, the device operates in the same way as the first button .

ten

15

Thus, the device allows for rapid switching of the electric drive without a time delay, which increases reliability.

Claims (1)

Invention Formula A motor control device comprising a control button connected in series with the winding of the first relay, the first and second switching contacts of which are connected to the windings of the first and second starters, respectively, the main contacts of which are connected to the motor power supply circuit and the closing contacts are connected to the closing parts the switching contacts of the first relay, the disconnecting block contact of the first actuator is connected in series with the winding of the second actuator, and the disconnecting block contact torogo actuator - series with the coil of the first actuator, the time delay relay for release, the winding of which is connected in series with its closing contact, differs from the fact that, in order to increase reliability, the second and third relays are introduced into it, the first relay is made with two additional opening contacts, and the first and the second starters - with additional locking and disconnecting block-contact Tat-ni each, while the winding of the second relay is connected to the first additional contact in series with the first relay and an additional closing unit with contact of the first actuator j bypassing the closing contact of the second relay, and opening contact of the third relay, the winding of which is connected to the series-connected second opening switch of the first relay, bypassing by the contact of the third relay, and an additional closing closing contact of the second relay, the key, and the additional switch; time relay and its closing contact through the opening and closing parts of the switching contact of the second relay is connected to the opening parts respectively, the first and second switching contacts of the first relay, the second winding terminal of the time relay is connected to a series of additional disconnecting contacts of the first and second starters.