SU1619312A1 - Device for checking electric wiring - Google Patents

Abstract

The invention relates to automation, computing and electrical engineering and is used in the manufacture of automation equipment, for example, to monitor signals. When connecting a test cable to the device inputs, it informs about the presence of an open circuit, short circuit, or cable. The aim of the invention is to improve the speed of the device. Achieving the goal is achieved by introducing a device containing a counter, a pulse generator, KOMMVTSTOP, a display unit, two triggers, the AND element and the starting pulse generator, a comparator, a HE element, a continuation pulse generator, and two status indicators. 1 il. c th

Description

The invention relates to automation and computer technology and can be used to verify electrical installation of harnesses.

The aim of the invention is to improve the speed of the device.

The drawing shows the functional diagram of the device.

The device contains a pulse generator 1, a counter 2, an indication unit 3, a decoder 4, triggers 5 and 6, a comparator 7, an AND 8 element, a HE 9 element, an isolation diode 10, the Start button 11, the Continued operation button 5 12, the setting unit 13 of the reference voltage load resistors 14-19, smoothing capacitor 20, LEDs 21 and 22, a group of cells

23 polling, each of which contains a HE 24 element, a load resistor 25, isolation diodes 26 and 27, a buffer amplifier 28 and an AND 29 cell. The cells 23, diode 10, resistors 14 and 15, and the capacitor 20 form a switch. LEDs 21 and 22 with resistors 18 and 19 form the indicators of the capacitor, then neither. Buttons 11 and 12 with resistors 16 and 17 form the starting and continuing pulse formers.

The device works as follows.

Let the ends of the wires of an operable n-wire cable be connected to the first and second inputs of the device. When you press the Start button 11, triggers 5 and 6 are reset, respectively,

The LEDs 21 and 22 are hot, the counter 2 is reset, a zero code is set at its output, respectively, zeroes are displayed on the display unit 3. A logic O signal appears at the zero output of the decoder 4, and a logical 1 signal appears at the setup input of the trigger 6. After the release, the LED 21 (CC) lights up. The inhibit signal of the logical About with the inverse output of the trigger 5 through the element And 8 enters the input of the generator and stops it. In this case, the number three is displayed on the display unit 3.

Fault LED 21 and digit

The start button 11 button's input to the account of the THREE on the display unit 3. inform

that the third wire of the capacitor 2 check, through the load resistor 16, receives a high-level enable signal, counter 2 is triggered and the traveling zero signal appears on the outputs of the decoder 4, and the running unit on the diodes 27 cathodes. Thus, at the setup input of the trigger 6 all the time there is a signal of logical 1 and trigger 6

This cable is shorted with a different cable wire. To find out exactly with which, press the button 12 (Continuing operation). The trigger 5 is reset, the LED 21 goes off and the generator 1 starts. After the counter 2 counts to 15, the LED 21 lights up and the generator 1 stops, and the number 15 is displayed on the display unit 3. Then press the Continue button 12 again, the circuit calculates to the last number and stops the generator 1, reveals that the third and fifteenth wires are closed.

20

is lost in the initial state (the light-emitting diode Break 22 does not burn.

The reference voltage at the input of the comparator 7 is set at such a level that when interrogating the cells 23, the voltage on the combined cathodes of the diodes 26 is greater than the reference voltage. Then at the output of the comparator 8 presence15

the signal is logical 1 and the trigger 5 remains in the initial state (the fault LED 21 does not light up). After the (logical) signal appears at the (n + 1) -th output of the decoder 4, the inhibitory signal of the logical O is fed to the input of generator 1 through element 8, the counting stops and the polling cycle ends. In this step, the number (n + 1) is displayed on the display unit 3. The capacitance of the capacitor 20 is chosen such that, when switching from one cell 23 of demand to the next, there is no failure of logical 1 and trigger 6 does not work.

Consider the case of a short circuit, for example, the third and fifteenth wires of the tested cable are closed. In this case, when the meter counts to three, i.e. At the output of the decoder 4, connected to the third cell 23, a logical signal O appears, and the remaining outputs of the decoder 4 present a logical signal 1. Accordingly, the amplitude of the signal on the combined cathodes of the diodes 26 becomes less than the reference voltage (a divider is created on the resistors 25 ) and at the output of comparator 1, a logical O signal appears, which sets the trigger 5 and

This cable is shorted with a different cable wire. To find out exactly with which, press the button 12 (Continuation of work). The trigger 5 is reset, the LED 21 goes off and the generator 1 starts. After the counter 2 reaches 15, the LED 21 turns on and the generator 1 stops, and the number 15 is displayed on the display unit 3. Then press the Continue button 12, press again. the circuit reads to the last number and stops the generator 1, reveals that the third and fifteenth wires are closed.

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Consider the case of a break, for example, in the fourth polling cell 23, the first and second inputs of the device are not connected. The circuit starts, and when counter 2 counts to four, a logical O signal appears at the fourth output of the decoder. This signal does not reach the amplifier 28, since there is an interruption and, accordingly, the logical O signal is generated at the output of element 29 at the same time, in other polling cells 23, the outputs of the And 29 elements also have a logical O signal. Thus, the setup input of the trigger 6 receives a logical O signal, it is set, 5 the LED 22 lights up and the generator 1 stops. At this time, the number four is displayed on the display unit 3, which on the display unit 3 and the burning LED Break 22 inform about the break of the fourth wire of the cable. To continue the operation, button 12 is pressed, trigger 6 is reset, LED 21 goes out and generator 1 is started.

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In the case when at the same time one wire has a short circuit and a break, then the fault of fault fault 21 and the LEDs ditch 22 are broken.

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Claims (1)

Invention Formula A device for controlling electrical installation, containing a pulse generator connected to the counter input of the counter, the output group of which is connected to the input groups of the display unit and the decoder, the output group of which is connected to the group of control inputs of the switch, the first and second triggers, the outputs of which are connected respectively to the first and second inputs of the element And, the pulse shaper start, the output connected to the first reset inputs of the first and second triggers, and the group of outputs and the group of information Switching inputs of the switch are groups of outputs and inputs of the device for connection to groups of inputs and outputs of controlled installation, characterized in that, in order to increase the speed of the device, a comparator has been entered into it, a follower pulse generator, two status indicators and a NO element, the zero output of the decoder through the element is NOT connected to the gate input of the switch, the enabling and signal outputs of which are connected respectively to the setup input of the second trigger and the first input of the comparator, the second input and output of which are connected with the output of the reference voltage setting device and the installation input of the first trigger, the enabling input of the counter is connected to the output of the start pulse shaper, the output is formed l continuation pulse operation is connected to the second inputs reset said first and second triggers, outputs connected to inputs of the first and second indicators of the condition, the last output of the decoder is connected to a third input of the AND gate, whose output is connected to the input of the stop pulse generator. 17 th vina by pr.rvb - V