SU765783A1 - Device for monitoring electromagnetic relay - Google Patents

Description

one

The invention relates to the field of instrumentation technology and can be used to monitor the parameters of electromagnetic relays in enterprises producing and using electromagnetic relays.

Devices for monitoring parameters of electromagnetic relays are known, comprising a smoothly increasing voltage generator, a resistor, a differentiating circuit, pulse shapers, threshold devices, logic gates AND, as well as a control mode switch in which the instant of operation and release of the monitored relay is determined by abrupt current changes flowing through the winding of the relay ij.

Of the known devices, the closest in technical essence to the invention is a semiautomatic device for controlling relay parameters, comprising a generator of linearly varying voltage, connected to a comparison circuit and, through a switch, to a winding of a tested relay, blocks of rates connected to other inputs of circuits comparisons, shelf life and control circuitry.

This device is designed to control relays with up to four contact groups, and contains eight current sources per 10 mA and as many as 5 current sources per 100 mA connected to the normally open and closed contacts.

In the known device, there is a possibility of determining the moments of operation and release of the relay by closing or opening the contact groups C23.

15 The disadvantages of the known device are cumbersome, due to the large number of current sources, and the poor quality of the control due to the lack of control of the possibility of a possible closing of the switching contact simultaneously with the closing and opening contacts, the dependence of the rate of change of voltage on the relay coil on the relay time parameters, the absence of the possibility of fixing and changing;: c: Yyyy, the response rate is unavailable and there is no possibility of programmatically changing the initial value of linearly changing y.

30 Voltage on the winding of the relay. The purpose of the invention is to simplify the device and improve the quality and productivity of control. This is achieved by the fact that the device for monitoring parameters of electromagnetic relays contains a control unit connected in series, a program block, a setup unit, a validity analysis unit, an indication unit, a switching unit connected to the control unit, a current source and terminals for connecting the winding and contacts monitored relays, a generator of stepwise varying voltage, a pulse distributor, keys according to the number of monitored contacts, two diodes, a group of logic elements and the number of contacts to be controlled are introduced two logical elements NOT, three logical elements OR, four logical elements AND, three-input shift register and a trigger, the shift register connected to one input of each of the group of logical elements AND, the outputs of which through one logical element OR are connected to the inputs of two of the other four logic gates And, each of the outputs of which are connected to the trigger inputs, and to the other inputs of these two logic elements AND connect the output of the control unit, the trigger outputs are connected to the two inputs of the generator by stepwise changing Its voltage is connected to the inputs of the unit for analysis of the validity and the switching unit, while the terminals for connecting the switching contacts of the monitored relay are connected to the corresponding switches, the control inputs of which are connected to the corresponding outputs of the pulse distributor, one of the other outputs of which is connected to the zeroing input of the shift register; the terminals for connecting the disconnecting contacts of the monitored relay are connected via another logical element OR to the input of the third of the other four logical elements And the input of one logical element is NOT the output of which through the fourth of the other four logical elements of AND connected to the input of the third of the logical elements OR, the output of which is connected to one input of the shift register, terminals for connecting the break contacts of the monitored relay through one diode are also connected to the source current, and through another diode - to the terminals for connecting the closing contacts of the monitored relay, which are connected via another logical element NOT to the fourth of the four logical elements And, the other shift register input, the third input and a third input trigger generator stepwise varying voltage connected to respective outputs of the control unit FIG. 1 shows a diagram of the described device; in fig. 2 is a graph of time diagrams. The device contains a sequentially connected control unit 1 program block 2, a setting unit 3, an analysis analysis unit 4 connected by an output to the display unit 5 and a control unit 1. The second output of the control unit 1 is connected to the switching unit b connected to the winding 7 of the monitored relay. The device also contains a pulse distributor 8 connected by outputs to the control inputs of keys 9. 4. I,. The outputs of the keys are connected to the common bus, and the other inputs are connected to the switching contacts of the monitored relay. The opening contacts of the monitored relay are connected and connected through the first logic element 10 to the first input of the logic element 11 and the logic element NO 12 connected by an output to the third input of the logic element 13. In addition, the contacts are connected to the source output 15. The output of the current source 15 is also connected via the second decoupling diode 142 to the closing contacts of the contact group 16 ... ti of the monitored relay connected via the logical element HE 17 to the second input m, the logical element And 11, and directly from the second input of the logical element And 13. The outputs of the logical elements And 11 and 13 through the logical element OR 18 are connected to the shift input of the shift register 19. The outputs of the shift register 19 are connected to the first inputs of the logical group- elements AND 20, the outputs of which through the logical element OR 21 are connected to the first inputs of logical elements AND 22 and 23. The second inputs of logical elements AND 22 and 23 are connected to the third inputs of logical elements And 11 and 13, respectively, and connected to the output of the block 1, and the outputs of the logic elements 22 and 23 are connected to the installation inputs of the trigger 24 connected to the generator 25 by stepwise varying voltage, the output of which is connected to the second inputs of the analysis unit 4 and the switching unit 6. The second inputs of the first logic element OR 10, groups of logic elements AND 20, generator 25 of stepwise varying voltage and control input of current source 15 are connected to the corresponding outputs of program block 2, and outputs of control unit 1 are connected to inputs of pulse distributor 8, generator 25, trigger 24, and shift register 19. The zero reset input of c.11viga 19 is connected to the last (n + 1) th output of pulse distributor 8, where n is the maximum number of relay contact groups monitored in the proposed device.

The number of keys 9 logical elements And 20 is also equal to p. The operation of the device is described for the case when the monitored relay contains k contact groups.

After switching on the monitored relay with the help of a contact device (not shown in the drawing) by a signal from the control unit 1, the program block 2 enters 25 step-varying voltage into the generator - the code of the minimum tripping voltage of the monitored relay Ucp. min and the response time code is tcp, in the block of settings 3 — the limit value code of the operation voltage of the relay Ucp-tp., to the second input of the k-ro logic element AND 20 — the enabling signal, to the current source 15 — the code of the value of the current passed through monitored relay contacts.

Simultaneously from the control unit 1, pulse distributor 8 is started, trigger 24 is zeroed, AND 11 is enabled at the third input, AND 22 at the second input, and one is recorded in shift register 19. According to the permission signals from the control unit 1 and the trigger 24, the voltage Ucp is generated at the output of the generator 25 by stepwise varying voltage. inin coming directly to the unit of analysis of validity 4 and through the switching unit b to the winding 7 of the monitored relay.

The impulse from the first output of the distributor 8 opens the key 9 and if under the influence of voltage and cf. min contact group 16 (triggered, the current from the current source 15 through the diode 14 2 and the closed contacts flows to the common bus and on the cathode of the diode 14 a negative impulse appears, coming directly to the second input of the AND 13 logic element and through the logical element HE 17 - to the second input of the logical element AND 11. Since each of the logical elements AND 11 and 13 is a coincidence circuit for a positive signal, the pulse n is only at the output of the logical element 11 and further through the logical element OR 18 on shifts m input shift register 19, Unit of information recorded in it with the control unit at the beginning of the control process is advanced to the next discharge.

Next, a pulse from the second output of the pulse distributor 8 opens the key 9d. Suppose that the contact group 162 did not work. Then IQK, from the current source 15 through the diode

14 and key 92 flows to a common bus. At the cathode of diode 14, a negative pulse appears, which through the logical element OR 10 prohibits the logical element AND 11 from the first 2 input (the logical element AND 13 is prohibited from the third input from the control unit 1). Therefore, the second pulse of the pulse distributor 8 to the input of the shift register 19 does not pass. By

 to the remaining pulses of the pulse distributor 8, when the corresponding contact groups are triggered, the unit in the shift register 19 advances further. As with the voltage Ucp. generator 25 of stepwise varying voltage, not all contact groups worked, then the number of pulses at the shift input of the shift register 19 will be less than the number k and at the first input of the logic element AND

0. 20 | the enable signal is not consistent, but the pulse with the k + 1 output of the pulse distributor 8, the shift register 19 returns to the initial state. If, after repeated cycles paq5 of pulse limiter 8 (the repetition period of these cycles is significantly less than the response and release time of the relay), the unit in shift register 19 does not advance to the k-ro output,

Q then the voltage of the generator 25 with stepwise varying voltage increases by one step and the relay operation monitoring continues at a high voltage, and the step durability is equal (see Fig. 2, a).

If, with this value of the voltage on the winding 7 of the monitored relay, all contact groups have operated, the unit will advance to the k-ro output

0 shift register 19, permitting a logical / element AND 20 by. the first entry. Logic element AND 20 is allowed at another input from program block 2. Signal from logic element AND 20 through logic elements OR 21 and And 22 overturns trigger 24. Generator 25 with stepwise varying voltage stops and its output is fixed

0 is the voltage at which the relay has been activated, and which, in the validation analysis unit 4, is compared with the voltage Ucp gr. . The result of the analysis enters the display unit 5 and is recorded. At this, the control for actuation is terminated, and, after a signal from the analysis unit 4, the control unit 1 switches to monitoring the release voltage of the relay. Then, according to the signal from control unit 1, the program unit 2 generates a stepwise varying voltage to the generator - a code for the maximum value of the relay release voltage. ° time

5 release t ..; in the block of settings 3, the code of the limit value of the release voltage of the relay UQ p. the second input of the logical element I 20 | is the enabling signal, and the current source 15 is the code of the value of the current passed through the contacts of the monitored relay. From the control unit 1, the logic input e; 1, terminal 23, is enabled at the third input, the pulse distributor 8 is started, and one is recorded in the shift register 19. According to the permission signals from the control unit 1 and the trigger 24, the voltage I-op is generated at the output of the generator 25 in stepwise varying voltages. / ua-k. coming directly into the unit analysis of fitness 4 and through the unit, switching 6 on the winding 7 of the controlled relay. The pulses from the first output of the pulse distributor 8 unlock the key 9 and if during the voltage the contact group 16 released, then the current from the current source 15 through the diode 14 and the closed contacts flow to the common bus, a negative pulse appears at the cathode of the diode 14 logical elements OR 10, NOT 12 to the third input of the logical element. And 13 and then through the logical element OR 18 to the shift input of the shift register 19 and one

it is promoted to the next rank.

By pulses from the next outputs of the pulse distributor 8, in the case of releasing the corresponding contact groups, the unit in the shift register 19 advances further.

If the generator voltage 25 stepwise voltage Utjtn.max through the time torn ® the contacts of the monitored relay are released, then the number of pulses at the shift input of the shift register 19 will be less than the number k of the contact groups of the relay being tested and at the input of the logic element 20 on Vits, then on the pulse from the last n + 1 output of the pulse distributor 8 shift register 19 will be reset

If, after repeated cycles of the pulse distributor 8, the unit in the shift register 19 does not advance to the k-ro output, the voltage of the generator 25 of the stepwise varying voltage is reduced by one step. (see Fig. 26) and the control cycle repeats at the next voltage value on the relay coil.

When all the relay contacts are released, a pulse appears at the output of the AND 20, the inputs through the OR 21 and AND 23 logic gates to the zero reset input of the trigger 24, and the voltage of the relay releasing in the validity analysis unit 2 4, it is compared with the voltage UOTO c. The result of the analysis goes to the display unit 5 and to the control unit 1. This completes the monitoring of the release voltage.

If there is no disconnecting contact in the controlled type of relay, then when monitoring the release of a relay, the AND 13 logic element is resolved with a corresponding signal from the progrgshma 2 unit through the OR 10 and NOT 12 logic elements.

If, when monitoring the voltage of the operation or release of a relay, one or more of the switching contacts simultaneously closes with the closing and opening contacts,

logical elements and 11 and 13 will be

the one in the shift register 19 is also propelled to a smaller number of bits, the trigger 24 does not overturn, and the generator voltage 25 is a stepwise varying voltage

will increase to the maximum value at monitoring the voltage of operation and drop to zero during monitoring the release voltage, after which, in the validity analysis unit 4, a Scrap signal is generated, which also occurs in the event of a free or uncoupled contact group.

Using the proposed device allows you to control

voltage (current) actuation and release of the relay with one current source, detect relays with faulty contact groups and improve the accuracy and performance of the control.

Claims (2)

Invention Formula A device for monitoring the parameters of electromagnetic relays containing a control unit connected in series, a program block, a setting unit, an expiration analysis unit, a display unit, a switching unit connected to the control unit, a current source and terminals for connecting the winding and switching, opening and closing contacts of the monitored relay , characterized in that, in order to simplify the device and improve the quality and performance of the control, a generator of stepwise varying voltage, a pulse distributor, keys for the number of contacts of the monitored relay, two diodes, a group of logic elements AND for the number of contacts of the monitored relay, two logical elements NOT, three are entered into it logical element OR, four other logical elements And / three-input shift register and trigger, and the shift register is connected to one input of each of the group of logical elements And, the outputs of which are black s one logical the OR element is connected to one input of two of the other four logic elements AND, each of the outputs of which are connected to the trigger inputs, and to the other inputs of these two logic elements AND the output of the control unit is connected, the trigger outputs are connected to two generator inputs of stepwise varying voltage which is connected to the inputs of the unit for analyzing the validity and the switching unit, while the terminals for connecting the switching contacts of the monitored relay are connected to the corresponding keys, the control inputs of which are connected with the corresponding outputs of the pulse distributor, one of the other outputs of the pulse distributor is connected to the zeroing input of the shift register, the terminals for connecting the open contacts of the monitored relay are connected via another logical element OR to the input of the third of the other four logical elements AND through the fourth of the other four logical elements and is connected to the input of the third of the indicated other logical elements OR, the output of which is connected to one input of the shift register, terminals for connecting the disconnecting contacts of the monitored relay, draw one diode also connected to the current source, and through another diode - to the terminals for connecting the closing contacts of the monitored relay, which are connected through another logical element NOT to the fourth of four other logical elements AND and the other input of the shift register, the third trigger input and the third generator input with stepwise varying voltage are connected to the outputs of the control unit. Sources of information taken into account in the examination 1, USSR Author's Certificate 520566, cl. G 05 B 23/02, 1975, 2.Boldyrev V.D. and Sokolov D.A. Semiautomatic device for control of relay parameters. Sat Exchange of experience in the radio industry 1976, no. 4, p.47 (prototype).