SU1543421A1 - Device for inspecting electric wiring - Google Patents

Abstract

The invention relates to computing and can be used to control the electrical installation of products. The purpose of the invention is to reduce the hardware cost of the device. The goal is achieved by the fact that a switch, three AND elements, the NOT element are entered into the device containing the decoder, pulse generator, counter, interrogation switch and control unit. In the polling switch controlled by the decoder counter, switching relays are switched on alternately. The circuits to be tested are alternately connected between the power supply and the current sensor. If an electrical circuit is formed for each clock pulse, a "NORM" signal is formed, otherwise a "FAILURE" signal. 3 il.

Description

The invention relates to computing technology and is intended for use in devices for controlling electrical units.

The purpose of the invention is to reduce the hardware cost of the device.

FIG. shows a block diagram of the device; Fig. 2 is a functional block diagram of the control unit; fig.Z - diagram of the current sensor.

The device contains a generator of I pulses, control unit 2, counter 3, decoder 4, first element 5, switch 6, interrogation, current sensor 7, element 8, switch 9, second element 10, trigger}, third element 12 , inputs-outputs 13 devices, control object 14 and display unit 15.

The control unit 2 is a trigger 16. The current sensor 7 can be made on the basis of a resistor 5 7 and a threshold element 18.

The switch 6 of the survey contains a relay 49.1, 19.2, ..., 19.ps contact groups 20.1, 20.2, .. ,, 20.p.

The device works as follows.

In the initial state, counter 3 and trigger 11 are zeroed.

The signal of block 2, the counter 3 starts counting pulses, and the input element And 10 receives a signal allowing the passage of polling pulses from the generator 1. The pulse sequences fed to the input of the element And 10 are offset from the pulses fed to the input of counter 3, which

eliminates interference and signal lag at switching times. When counter 3 starts counting pulses from generator 1, signals that alternately turn on relays of switch 6 appear at outputs of decoder 4. Since the second enable element 1 arrives at trigger 11 of the second element 10, the interrogation pulses from generator 1 arrive at the element input And 5.

In this case, when checking the electrical circuits of the object 14 for control of the message, the monitored circuits are connected between inputs 13-1, 13-2. When switched on, for example, relay 19.1, its contacts 20.1 are thrown to the position opposite to that shown in Fig. 1, and sensor 7 is connected via a controlled circuit to the power bus. With a properly monitored circuit through the current sensor 7, the current flows, while the switch 9 is turned on so that the signal O arrives at the input of element 5. If all the circuits of the monitored object 14 are closed, then the trigger 11 remains in its original state and the signal from the decoder 4 forms the output of the element And 12 signal Norm. By the same signal, through block 2, the counting of pulses by counter 3 is stopped and the generation of interrogation pulses at the output of the element 10 is prohibited. In the absence of contact in any of the tested circuits from the current sensor 7, through switch 9, the signal 1 enters the input of element 5 The interrogation passes through the element I 5 to the input of the trigger I and it overturns. Thus, using block 2, a signal is generated that prohibits further counting of pulses by the counter 3, it stops and the number of the faulty circuit is displayed on the display block 15.

If it is necessary to continue the check on the signal sent to the bus. Step (start), the trigger 11 returns to the initial state and the check continues.

In the test mode of electrical circuits for disconnection (absence of closures), the controlled circuits of the object 14 of the control are connected to the outputs 13-3, and the output of the current sensor 7 is connected to the input of the element AND 5 through the element HE 8 and the switch 9.

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In the initial state, all controlled circuits are connected via a normally closed contact 20 to the power bus. Then, the relays of the switch 6 are alternately turned on and alternately each of the monitored circuits is disconnected from the power bus and connected via the corresponding normally open contact 20 to the current sensor 7. If the circuit is not connected to any other controlled circuit, then the current through current sensor 7 does not flow and the trigger 11 does not overturn, counter 3 continues counting until the signal ends the cycle and the Normal signal is generated. If the monitored circuits are electrically connected, then a current flows through the current sensor 7 and the interrogation pulse passes through the element 5 and trips the trigger 11. The test stops and the number of the faulty circuit is formed on the display unit 15.

Claims (1)

Invention Formula A device for controlling electrical installation, comprising a pulse generator, a polling switch, the first and second groups of inputs of which outputs are input / output groups of a device for connecting to a control object, and a group of address inputs connected to a group of outputs of the decoder connected to a group of inputs meter outputs whose counting input input is connected to the first output of the control unit, characterized in that, in order to reduce the hardware costs of the device, a current sensor is inserted into it, This And, the switch, the element is NOT and the trigger trigger, and the output of the polling switch through the current sensor is connected to the first input of the switch and the input of the element NOT, the output connected to the second input of the switch, the output of which is connected to the first input of the first element And respectively, to the output of the second element I and the installation input of the trigger trigger, the output of which is connected to the first reset input of the control unit and the first inputs of the second and third elements I, the second inputs of which are connected the first output of the pulse generator output decoder ii, vy per-- reset input start trigger and the counter reset input connected to the second output of the control unit, the second reset input of which is connected to the output of the decoder, the count input the counter is connected to the second output of the pulse generator, the output of the third element I is the indicator output of the device, the second reset input (the trigger trigger is the start input of the device. one V y ten 0 / 700C ltctn.JQ "N k / 71 $ but 12 ma eight R eleven figure 1 fwae SS &. Bt11 dm 4 of fig. Z Compiled by V. Vertlib Tehred M. Didyk Proofreader V.Girn to Editor L.Pcholinsk : | order 402D circulation 568Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 NZ sixteen K1Q fig.Z Proofreader V.Girn to