SU756368A1 - Electric drive control device - Google Patents

Description

The invention relates to the field of automation and can find application in devices of the electric drive.

A device for controlling an electric drive is known, comprising a tracking system with a speed controller and a counter, an automatic system with a counter and a valve, a manual control circuit, a brake system control unit [DZ ·

The disadvantage of this device is its complexity.

The closest to the invention to the technical essence is a device for controlling the electric drive containing four flip-flops, the inputs of which are connected to the corresponding contacts of the control unit and the input bus, the drivers, the outputs of which are connected to the control tires by the speed and direction of movement of the electric drive, and whose inputs are connected to the outputs of the corresponding logical elements of the INR-NOT, and one input of the logical element ILY-NOT of the first speed control channel is connected to the first input of the logic ementa NOR brake control channel and input of the control channel vto2

speed, the second input of the logic element OR-NOT is connected to one input of the logic element OR-NOT of the control channel of the second speed and the output of the driver of the third-speed control channel and the second input of the logic element OR-NO of the brake control channel. The third input of this logical element 1 OR OR-NOT is connected to the output of the first-speed control head driver, the inputs of the second-speed control channel OR-NO are connected to the output of two inverters, the second input of the second speed control logic is an inverter, and the output of the logical element OR-NOT of the brake control channel is connected through the fourth inverter to the input of the corresponding driver \ _2 ^. However, this device is not reliable enough.

The aim of the invention is to increase reliability.

This goal is achieved by the fact that the device introduced two additional logic element OR NOT time relay, logic element AND 30, three additional inverter input

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one of which is connected to the inverse output of the first trigger, and the output is connected to the first input of an OR-NO logic element of one direction control channel directly, and to the first input of an OR-NOT logic element of the second direction control channel via a second additional inverter, the second input of this logic element OR is NOT connected via the third additional inverter with the inverse output of the fourth trigger, and the third input of the OR gate of the given channel is connected to the second input of the logic element ment OR NOT another direction control channel and the output of the first additional logic element OR NOT, the inputs of which are connected to the direct outputs of the first and fourth triggers, the output of the second trigger connected to the input of the first of the mentioned main inverters, the output of the third trigger connected to one input of the logical element And, the output of which is connected to the input of the second and third main inverters, and the second input of the logic element And is connected to the output of the time relay, the inputs of which are connected to the outputs of the worlds of channels controlling the direction of movement and the inputs of the second additional logical element OR-NOT, the output of which is connected to the third input of the logical element OR-NOT of the first speed control channel.

Structural electrical circuit of the described device is shown in the drawing.

The described device contains .trigger 1, inverter 2, logic elements OR-NOT 3, 4 inverter 5, trigger b, drivers 7.8, logic OR-NOT 9.10, driver 11, trigger 12, logic element I 13, inverter 14 , logical element ILINE 15, driver 16, trigger 17, ₍ inverter 18, logic element ILINE 19, driver 20, logical element OR-NOT 21, inverter 22, form-generator 23, logical element OR-NOT 24, inverter 25, relay time 26, inverter 27, command switch 28.

The input signals are fed to the input bus 29. (The control device includes contacts, respectively. 30 ... 36.

Elements 21-23 form a brake control channel, elements 10 and 11,

15 and 16, 19 and 20 form the speed control channels, respectively; elements 3 and 7, 4 and 8 form the direction control channels.

The output signals to the drive are removed respectively from the tires 37.,. 42.

The principle of operation of the device is as follows.

The device receives power +6 And -12 V from the power supply through the relay contacts (not shown in the drawing). The switching on of the relay, and consequently, the supply of power to the device is possible only at the position of the control unit handle at the position of contact 33. After switching on, the relay is blocked by its contacts.

If the command device is in the position of contact 33, the device will generate prohibitory signals for,., The power supply to the output buses 38 and

40 first, second and third speeds as well as to the brake bus 37. In this case, the trigger 1 is in such a position that, from its output through the inverter 2, a signal "1" is sent to the element OR-NOT 3 and the signal on the bus

41 is missing. There is also no signal on bus 42, since the input element OR-NOT 4 receives the signal "1" from inverter 5, which receives "0" from trigger 6. From the outputs of drivers 7.8, the signal OR-NOT 9 receives signals' "0", which, in turn, cause the appearance of "1" at the output of the element OR NOT 9. This prohibitory signal is fed to the input of the element OR NOT 10 and through the driver 11 to the bus 38.

The signal "0" from the output of the trigger 12 is fed to the input element And 13 and causes the appearance of 0 "at its output. This signal through the inverter 14 is fed to the bus 39, since the output of the element OR NOT 15, and hence the driver 16, will "0".

From the output of the trigger 17 is fed "0" to the input of the inverter 18. After double inversion at the output of the element OR NOT 19, as well as the output of the former 20, this signal will cause "0".

On the bus 37 will be "0", since the element OR-NOT 21 from the outputs of the formers 11, 16, 20 receives "0", which after double inversion give the output of the former 23- "0".

When you install the handle of the command device on pin 32, the following happens; at the output of trigger 1, "1" appears, which after inverting causes the appearance of "0" at the input of the element OR NOT 3. At the remaining inputs of this element it will also be "0", indeed at the output of the element OR-NOT 24 will be "0", so as its input receives “1” from trigger 6. At the output of time relay 25 there will be “0”, since its input receives “1”. Thus, the output of the element OR NOT 3 will be "1" and therefore there will be a signal on the bus 41. At the same time, "1" from the driver 7 through the inverter 9 gives a signal on the bus 38. From the driver 11 "1" it enters the input of the element OR -NE 21 and gives, after double inversion, a signal on bus 37. Some time after the occurrence of "1" at the output of the driver 7, at the output of the relay, time5

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6

Neither 26 will appear. "1" and will prepare the element And 13 for inclusion.

If komandoapparat. will be set from the position of contact 33 to the position of contact 34, then the trigger 1 will remain in the same position, and the trigger 6 will change its state and “1” will appear on its output, which will go to the input of the inverter 5 and will cause a signal on the bus 42. Similarly, the work will take place in other positions of the command device.

In case of accidental closure of any contacts of different directions, simultaneous installation of triggers 1 and 6 takes place in such a state that "O" appears on their outputs. These signals affect the inputs of the element OR NOT 24, while the output will appear: "1", which prohibits the signals on the tires 41,

42. The disappearance of these signals will cause disconnection of signals from buses 37, ... 40. Since :, the speed of the circuit is very high, the shutdown occurs almost instantly. In order to bring the circuit out of this state, it is necessary to set the control knob in the position of contact 33.

When two or three contacts of different speeds of the same direction are simultaneously closed, lower speed is preferred.

Claims (1)

Claim A device for controlling an electric drive containing four triggers whose inputs are connected to the corresponding contacts of the controller and the input bus, a driver whose outputs are connected to the speed control and direction of movement of the electric drive, and the inputs of which are connected to the outputs of the corresponding logical elements OR NOT, and one input the logical element OR-NOT of the control channel of the first speed is connected to the first input of the logical element OR-NOT of the brake control channel and to the input of the driver control of the second speed, the second input of the said logic element OR-NOT is connected to one input of the logical element OR-NOT of the control channel of the second speed and the output of the driver of the control channel of the third speed, and the second input of the logical element OR-NOT of the brake control channel, the third input of this logic element OR-NOT is connected to the output of the first-speed control channel former driver, the inputs of the second-speed control channel OR-NOT logic element are connected to the output of two inverters, the second input of the second speed control OR-NOT logic element, moreover, the output of the logical element OR-NOT of the brake control channel is connected through the fourth inverter to the input of the corresponding driver, characterized in that, in order to increase reliability, it is There are two additional logic elements OR-NOT, a time relay, logic element I. and three additional inverters, one input of which is connected to the inverse output of the first trigger, and the output is connected to the first input of the logic element OR-NOT of one direction control channel directly, but to the first input of the logical element OR — NOT the second control channel of the direction through the second additional inverter; the second input of this logical element OR — NO is connected via the third additional inverter with the inverse the fourth trigger, and the third input of the logical element OR-NOT of this channel is connected to the second input of the logical element OR-NOT of another direction control and output of the first additional logical element OR-NOT, whose inputs are connected to the direct outputs of the first and fourth triggers, and the output The second trigger is connected to the input of the first of the mentioned main inverters, the output of the third trigger is connected to one input of the logic element And, the output of which is connected to the input of the second and third base inverters, and the second input of the logic element I is connected to the output of a time relay whose inputs are connected to the outputs of the drivers of the direction of movement control channels and the inputs of the second additional logic element OR NOT, the output of which is connected to the third input of the logic element OR NOT the control channel first by speed.