SU490123A1 - Device for detecting electrical faults - Google Patents

Description

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The proposed device relates to the field of automation and computer technology and can be used in the construction of devices for the production control of electronic equipment.

Known devices for detecting electrical installation faults include a galvanic communications recorder, first and second meters, the first outputs of which are connected to the corresponding inputs of the galvanic communication recorder, an output unit whose inputs are connected to the second outputs of the meters, an input unit, an address register, an input which is connected to the output of the input unit, and a control unit associated with the first and second counters. The first input of the control unit is connected to the output of the recorder of galvanic communications, the second input is connected to the output of the output unit.

The relatively low operational reliability of the known devices is a consequence of the frequent malfunction of the galvanic communications recorder, the equipment volume of which is a significant part of the equipment volume of the entire installation check device.

Failure of any switching key to cause a false information about the checked installation, that is, to the disruption of the normal functioning of the device, which accordingly reduces its reliability.

The proposed device is characterized in that it comprises a storage unit, a failure analysis unit and two coincidence elements. The first inputs of the matching elements are connected to the output of the address register, the outputs to the inputs of the first and second counters, respectively, and the second inputs to the first and second outputs of the control unit. The third output of the control unit is connected to the first input of the storage unit, the second input of the storage unit is connected to the second output of the address register, and the output to the input of the failure analysis unit, the output of which is connected to the third input of the control unit.

This makes it possible to reduce operating costs by further reducing the effect of failures in arbitrary cells of the galvanic recorder on the 10-minute operation of the device for detecting electrical installation faults.

The block diagram of the proposed device is shown in the drawing.

The device contains a registrar of 1 galvanic connection with the matrices 2 and 3 of the switching keys interconnected and with the contacts being checked 4. The counters are controlled by counters 5 and 6, the outputs of which are entered in the output unit 7 and in the control unit 8. This unit 8 is connected, in addition, to the storage unit 9, the failure analysis unit 10, the galvanic coupler 1, the input unit 11 and the coincidence elements 12, 13, the second inputs of which are connected to the address register 14 and their outputs the inputs of counters 5 and 6. The input unit 11 is connected to the address register 14 connected to the memory device 9, which is associated with the failure analysis unit 10.

Each pair of switching keys connected in series with each other from the matrices 2 and 3 is assigned a two-bit cell of the storage unit 9, where information on the presence of a fault in the pair is stored at the beginning of operation of the device. If, as a result of prophylactic control, it turns out that some switching key failed, then the number 1 is written to the address corresponding to its number, moreover, in the cell that corresponds to matrix 2 or 3, where the faulty key is located. The presence of “1 in the cell of the storage unit indicates a failure, resulting in the loss of the ability to close the switching key (a failure type).

The introduction of the storage unit into the composition of the proposed device significantly increases its survivability due to the use of an adaptive installation check algorithm, which varies depending on the specific technical condition of the electroplating recorder.

Let us consider the operation of the device for detecting faults in the installation located on the tested contacts 4, renumbered, for example, by the natural numbers NI, NZ, Лз. ..., iVn.

The program for checking it is recorded on a carrier (punched tape) by groups of numbers corresponding to galvanically connected contacts. The last largest number in each group is combined with a sign indicating the end of the electrical circuit.

Failure information in the recorder 1 is entered into the corresponding cells of the storage unit, the verification program is entered through the input unit (photo reader). First, the number of the first contact is entered. Then the circuit should be checked for an “open, i.e., clarification of the question whether all contacts whose numbers are recorded on a punched tape to the next“ end of the circuit are galvanically connected to each other. ”To do this, after entering the number of the first contact, look for In this installation any other contact (maybe even “superfluous”) connected to the first one. Suppose that the contact in question is detected and there are codes in counters 5 and b, according to which in matrices 2 and 3 each key is connected with a single operable key with a galvanic connection to them, laid out in a checked installation. Further, in accordance with the verification program, information recorded at the address following the first contact number is read from the storage unit 9. After analyzing it in block 10, the number taken is rewritten into one of the counters 5 or 6, which; controls the matrix of recorder 1, where, as you dreamed from as a result of the analysis, the corresponding key is found.

In the case of a correct Mounting, a signal should be present at the output of the recorder 1, indicating the presence of a connection, and if there is no such signal, then in the output unit 7 a fault is detected - an open circuit in the circuit under test. The same procedure for inputting from a punched tape, analyzing a failure of a galvanic connection recorder, rewriting the code into the corresponding meter and registering a galvanic connection is repeated alternately for all the contacts of the circuit.

After the sign of the end of the circuit from the punched tape, the presence of possible extra connections is monitored by iterating through all the contacts of the monitored installation located to the right (on the number axis) of the last contact of this circuit, and fixing the detected links in the output block.

As an example, consider the process of detecting errors in a circuit located on pins 4, the test program of which can be written as Le 2, MQ 3, jN 5, "end of circuit.

We will now write the numbers of the switching keys associated with the contacts included in the specified price, in square brackets enclose the numbers of the faulty keys (data about them are in the storage unit 9): the keys in the matrix 2 are l 2, d 3, the keys in matrix, lg3, 5.

The nerve-to-number in the co-tact chain ("2) is entered through the input block 11 into the address register 14 and then through the coping elements 12 and 13 into both counters 5 and 6. By this number, the code (01) is read from the memory block via the address register corresponding cell, which enters block 10 of the failure analysis.

Since, according to the assumption, only one key was corrected from the pair of switching keys associated with the NO 2 contactor, a command is generated to enter the address of the next number (No. 3) in the register, and the result of the analysis is remembered. The code (01) of the cell with the address No. 3 is read and analyzed in block 10. Since both pairs of switching keys (2 and ЛЛЗ) have damages in the matrix controlled by the same counter 6, its readings for each pulse from block 8 Controls begin to increase by one (i.e., sequential non-selection of keys in matrix 3 is performed, starting from key 02). As soon as the code Kb 5 appears in the meter 6, a signal from the galvanic communication recorder appears, indicating the presence of a galvanic connection between contacts 2 and 5, as a result of which the search stops. Then the code (No. 3) from the address register is rewritten into counter 5 and the presence of a connection already between contacts No. 3 and No. 5 is checked. Taking into account that there is no installation error and such a connection exists, the next number (No. 5) is entered into the address register from the punched tape and the corresponding cell of the memory block is accessed. As a result of the next analysis, it is found out that the key in matrix 3 is working, after which the information from the address register through element 13 matches is overwritten into counter 6. There are no open circuits detected, and since the last number was entered (# 5) the end of the circuit appears, the device proceeds to search for possible extra connections. To do this, with the help of the counter 6, all the remaining contacts are sorted up to the last. The signal for the end of the search enters the control unit, after which the next circuit begins to be checked.

When checking a circuit for an open circuit, another contact having a galvanic connection with the first one entered from a punched tape must necessarily exist, because otherwise it can be stated either an open circuit in the circuit or a failure of all the keys associated with the contacts. circuit, and located in the same matrix of the recorder galvanic couplings. The last option will be considered invalid, and for its recognition, if necessary, we will sequentially enter from punched tape and analyze in block 10 all the numbers up to the end of the target. The absence of at least one “О” in the corresponding discharge of all the read cells indicates the need for repair of the registrar of electroplated communications. The same is required in the case of the presence of "1 simultaneously in both digits of the cell.

As a storage unit, it is convenient to use semi-permanent storage.

device, for example, based on a ferroelectric. If a memory block is supposed to be used, information in which is destroyed when the power is turned off, then

Failure data can be stored on a punched tape, and its contents can be rewritten into a storage unit before starting work.

Improving the reliability of the device also contributes to the fact that in a number of cases the false reading of the I from the storage unit is not reflected in the quality of the mounting check.

Subject invention

A device for detecting electrical installation faults, containing a galvanic communications recorder, the first and second meters, the first outputs of which are connected to the corresponding inputs of the galvanic communication recorder, an output unit, the inputs of which are connected to the second outputs of the meters, the input unit, the address register, which input connected to the output of the input unit; a control unit which is connected to the first and second counters; the first input of the control unit is connected to the output of the recorder of galvanic couplings; the second input from one with output block output, different

in order to increase flexibility and operational reliability, it contains a storage unit, a failure analysis unit and two coincidence elements, the first inputs of which are connected to the output of the address register,

the outputs are connected to the inputs of the first and second counters, respectively, and the second inputs are connected to the first and second outputs of the control unit, the third output of which is connected to the first memory input} of the 1st unit,

the second input of the storage unit is connected to the second output of the address register, and the output is connected to the input of the failure analysis unit, the output of which is connected to the input of the control unit.

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