SU1638667A1 - Device for checking potentiometer - Google Patents

Abstract

The invention relates to the field of instrumentation technology and can be used to control potentiometers. The purpose of the invention — an increase in the accuracy and performance of the control — is achieved by introducing a sampling and storage unit 20, waiting for the multivibrator 21 and the memory register 4 with corresponding links. In addition, the device contains a current collector drive 5, a block 6 with the first 7 and second 8 terminals for connecting a controlled potentiometer 1 (having a speech element 2, a current collector 3 on the axis 4), an angle converter 9, a voltage source 10, the first 11 and second 12 comparators, elements AND 13, start block 14, control block 15, setpoint reference unit 16, pulse counter 17, first 18 and second 19 OR elements, analog-to-digital converter 22, recorder 23 and non-contact alarms 25. 1 il. . i (/)

Description

The invention relates to instrumentation technology and can be used for automated control of a potentiometer.

The purpose of the invention is to improve the accuracy and performance of control potentiometers.

Functional diagram of the device for monitoring potentiometers is shown in the drawing.

The device contains a controlled potentiometer 1, containing a resistive element 2 and a current collector 3, mounted on the axis of the actuator 5 of the current collector, the output shaft 4, block 6

with the first 7 and second 8 terminals for connecting a controlled potentiometer, angle converter 9, voltage source 10, first 11 and second comparators 12, element 13, start block 14, control block 15, setpoint reference 16, pulse counter 17, the first 18 and second 19 OR elements / sample and storage unit 20, the waiting multivibrator 21, the analog-to-digital converter 22, the recorder 23, the memory register 24 and the non-contact signaling device 25.

In this case, the output of the launch block 14 is connected to the first inputs of the block 15.

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control and alarm 25 some clocking, the second input of which is connected to the output of the first comparator 11 and the first input element And 13, the second input of which is connected to the output of the angle converter 9, and the output to the counting input of the pulse counter 17, the installation input of which is connected to the output of the block 16 of the reference setting, the input of which is connected to the first output control unit 15, the second output of which is connected to the input of the current collector drive 5, the second input to the first input of the first element OR 18, the output of the second element OR 19 and the first Vyhm recorder 23, the second input is connected to the second input of the first element OR 18, the input of the waiting multivibrator 21 and the clock output of the pulse counter 17, the information output of which is connected to the information input of the memory register 24, the control input of which is connected to the output of the waiting multivibrator 21 and a control input of the sampling and storage unit 20, the information input of which is connected to the second input of the second comparator 12, the middle output from the current collector 3 of the resistive element 2 and the second input of the first comparator torus 11, the first input of which is connected to the first output of the voltage source 10, the first terminal 7 for connecting the monitored potentiometer 1 and the second input of the analog-digital converter 22, the first input which is connected to the output of the first element OR 18, the third input to the output of the unit 20 sample and store, information output — with the first information input of the recorder 23; the second information input of which is connected to the output of the memory register 24; the second output of the voltage source 10 is connected to the second terminal 8 for connecting the control Potentiometer 1 and the first input of the second comparator 12, the output of which is connected to the first input of the second element OR 19, the second input of which is connected to the output of the non-contact signaling device 25, and the output shaft 4 of the actuator 5 of the current collector 3 are connected to the angle converter input 9.

The device for monitoring potentiometers operates as follows.

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Before starting to control the parameters of the monitored potentiometer 1, it is connected to the block 6 via terminals 7 and 8 and the current collector 3 is installed outside the working angle, i.e. in the sector where the resistive element 2 is absent. After that, the measurement start block 14 is turned on, which produces a start pulse, which causes the non-contact detector 25 (which can be performed on the basis of a trigger with separate inputs) to be in the initial state and includes through the first input, the control unit 15, so that its first output signal, through the setpoint reference unit 16, brings the pulse counter 17 to the initial state, the digital value of which corresponds to the response threshold of the first 11 and second 22 th comparators. The second output signal of the control unit 15 at this time includes the drive 5 of the current collector, which, through the output shaft 4, causes the rotation of the current collector 3 and the input shaft of the angle converter 9. Then, as the drive 5 of the current collector 3 rotates, the current collector reaches the beginning of the resistive element 2 and the voltage at the input of the first commulator 11 begins to increase. In this case, the output pulses of the angle converter 9 through the second input of the element I 13 do not pass to the counting input of the counter 17 pulses. The moment when the voltage at the output of the current collector 3 reaches the threshold of operation of the first comparator 11 at its output and, consequently, at the first input of the element 13 there appears a signal opening the element 13 to pass the output pulses of the angle converter 9 to the input of the pulse counter 17 of the pulses. Thus, with further rotation of the output shaft 4 of the drive 5 together with the current collector 3 and the output shaft of the angle converter 9, the angle increases and the accumulation of pulses in the pulse counter 17 occurs, which is proportional to the digital angle value and, therefore, the digital value of the reference impedance with a linear characteristic. As the pulses accumulate in the counter, 17 pulses are output from one of the trigger triggers of the counter of the 17 pulses periodically, depending on the need for

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controlled points of potentiometer i. discreteness of the control over the angle, pulses are received from the clock output of the waiting multivibrator 21, the output signal of which, through the control input, records in the memory register 24 the reference angle and, accordingly, of the controlled potentiometer, and through the control input of the sampling and storage unit 20 the actual resistance value of the monitored potentiometer at the time of arrival of the clock pulse at the information output of the sampling and storage unit 20 and at the third input of the analog-digital converter 22. At the same time, fixing coupon and real values occur in a short period of time. Therefore, a change in information at the output of the counter 17 and at the information input of the sampling and storage unit 20 does not affect the measurement result. The signal from the clock output of the pulse counter 17 simultaneously through the second input of the first element OR 18 passes a start pulse to the first input of the analog-digital converter 22 for converting a fixed voltage value at a given point at its third input from the output of the sampling and storage unit 20 and through the second the input triggers the recorder 2 to retrieve information from the memory register 24, and after the conversion is completed, and from the output of the analog-to-digital converter 22, by the end of the measurement pulse. The recorder 23, which can be an electronic computer with a communication unit with peripheral devices or a microprocessor, periodically perceives current information at discrete points on the first and second information inputs, processes it according to a given program and outputs it in a convenient form for consumption. After the current collector 3 reaches the end turn of potentiometer 1, the second comparator 12 is triggered. Its output signal through the second input of the second element OR 19 turns off the second input control unit 15 and, therefore, stops the drive 5 of the current collector 3, turns on the first input of the first element OR 18 digital sampler 22 and the recorder 23 through the first input. At this moment re

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the horn 23 perceives the nominal value of the controlled potentiometer. If during the control process a non-contact occurs between the resistive element 2 and the current collector 3, indicating defective condition, then the output of the first comparator 11 appears a voltage jump opposite to the jump sign that opens the AND 13 element, and the non-contact warning lamp 25 changes to another the steady state, and its output voltage, through the second input of the second element OR 19, turns off the control unit 15 and, therefore, the current collector drive 5, turns on the recorder 23 and, through the OR 18 element, converts the analog-to-digital converter 22. this case, the registrar 23 is fixed nekontaktirovani angle value and control is stopped.

Claims (1)

Invention Formula 25 five 0 five A device for controlling potentiometers, containing a current collector drive, voltage source, first and second terminals for connecting a controlled potentiometer, first and second comparators, angle transmitter, reference unit, first and second OR elements, AND element, analog-to-digital converter, counter pulses, the recorder, the non-contact detector, the control unit and the start-up unit, the output of which is connected to the first input of the control unit and the first input of the non-contact signaling device, the second input to The first input is connected to the output of the first comparator and the first input of the element I, the second input of which is connected to the output of the angle converter, and the output to the counting input of a pulse counter, the installation input of which is connected to the output of the reference unit, the input of which is connected to 0 laziness, the second output of which is connected to the input of the current collector drive, the second input to the first input of the first OR element, the output of the second OR element, and the first input of the registrar, the second input of which is connected to the second input ohm the first element OR and the clock output of the pulse counter, the first information input of the recorder is connected to the output five an analog-to-digital converter, the first input of which is connected to the output of the first OR element, the second input to the first input of the first comparator, the first terminal for connecting the monitored potentiometer and the first output of the voltage source, the second terminal of which is connected to the second terminal for connecting potentiometer and the first input of the second comparator, the second input of which is connected to the second input of the first comparator and the average output of the monitored potentiometer from the current collector, the output to the first input the second OR element, the second input of which is connected to the output of the non-contact signaling device and the output shaft of the current collector articulated with the input shaft of the angle transducer, distinguished by the fact that, in order to improve the accuracy and performance of the control, a sampling and storage unit, a waiting multivibrator and a memory register, whose information output is connected to the second information input of the recorder, are entered into it, information input — with an information output of a pulse counter, the clock output of which is connected to the input of a waiting multivibrator, the output of which is connected to the control inputs of the memory register and the sampling and storage unit; the input of which is connected to the second input of the second comparator, and the output - to the third input of the analog-digital converter.