SU830323A1 - Device for monitoring parameters of electromagnetic relays - Google Patents

Description

The invention relates to an automatic control technique and is intended for use in automated systems for checking the parameters of electromechanical K9mutation elements. : It is known: a device for monitoring the parameters of electromagnetic relays. However, such a device does not provide sufficient speed and reliability of control, since it uses the reference value of the monitored parameter, for example, the response current, which does not allow one device to provide multilevel tolerance control to the measurement, the values of the controlled parameters. The technical solution that is closest to the invention is a device for monitoring the parameters of electromagnetic relays, a switch containing the first input to the device input, a voltage comparison unit connected by the first input to the switch output, a control unit connected by the first inputs to the second inputs of the switch and the unit voltage comparison, the output of which is connected to the first input of the control unit connected by the second output and input, respectively, to the input and the first output of the program block, and third inputs - to the outputs of the analysis unit; the state of the contacts connected by the input with the second output of the program block. The disadvantage of this device is relatively low speed and reliability, as well as increase. (drop) the voltage on the winding of the monitored relay continues until the contact groups of the relay are activated (released), and, for example, the voltage rise time can reach several tens of seconds, and the self-voltage can significantly exceed the operating voltage of the test- a relay that can disable it. The purpose of the invention is to increase the performance and reliability of the device. . The goal is achieved by the fact that the voltage comparison device connected to the device input, the voltage comparison unit connected by the first input to the switch output, the control unit connected by the first outputs to the second inputs of the switch and the unit compared to the output of which is connected to the first input of the control unit connected by the second output and the input respectively to the input and the first output of the program block, and the third inputs to the outputs of the en block A contact counter connected to the second output of the program block was entered into the contact state, a counter connected by one input to the third output of the program block, a pulse generator connected by the input to the fourth output of the unit, two And elements, and a D / A converter whose output A switch and a voltage comparison unit are connected to the third inputs, and the input is connected to another input of the comparator and connected to the output of a reversible counter connected by other inputs to the third output the ynpaBxi unit and the outputs of the And elements, the first inputs of which are connected to the output of the pulse generator, the second inputs to the fourth input of the control unit and the comparator output, the third inputs are connected to the outputs of the contact state analysis block, and the fourth inputs of the And elements are connected to the fourth outputs control unit. The drawing shows the functional diagram of the device. The device contains an input 1, to which the winding of the tested relay is connected, the switch is a switching unit 2, a comparison unit 3 voltage (control unit), a control unit 4, a software unit (program input unit) 5, a pulse generator b, elements And 7. and 8 J unit 9 analysis of the state of contacts, reversible counter 10, digital-analogue converter 1.1 code-analogue, comparator. (code comparison unit) 12, blocks and elements 6,7,8,10 and 11 form a generator of stepwise varying voltage. The device operates as follows. After on: the controllable relay is emitted by a signal from the control unit 4, the program input unit 5 outputs the minimum voltage code of the controlled relay 0.8 to the reversible counter 10, to the pulse generator 6 the response time code t p, The control unit 3 is the code for the threshold value of the relay trigger voltage. , in block 12, code comparison, the operating voltage code sets an indication of the number of contact groups of the monitored relay in block 9. At the same time, control unit 4 switches on switching unit 2, which connects the winding of monitored relay 1 to control unit 3 and code-analogue output of converter 11. When monitoring the response voltage, the And 7 element is allowed on the second, third, and fourth inputs. Pulses with a period of equal to, from the generator. 6 pulses are fed through element 7 to the forward counting input of the reversible counter 10. With the arrival of each pulse, the code at the output of counter 10 is increased by one, the converter 11 code-analog converts the code from counter 10 to a voltage that is applied to the winding of the monitored relay. When all the contact groups of the monitored, the relay analysis unit 9, are triggered, the contact state generates a signal that arrives at the third input of the element And 7 and prohibits the passage of pulses from the generator b pulse. In the reversible counter 10, the voltage of the monitored relay is detected to be fixed}. The control unit ..j control cp 1calls the tripping voltage. the code-analogue coming from the output of the converter 11, with the boundary action of the trigger. If the relay has faulty contact groups (for example, welding a normally-closed contact and a switching contact), then the device operates as follows. The time of the relay operation by the contact state analysis unit 9 is not fixed, therefore the pulses from the generator of 6 pulses continue to flow through the AND 7 element to the forward counting input of the reversible counter 10. Once the output code of the counter 10 arrives at one of the inputs of the code comparison unit 12. , reaches the code of operating voltage j supplied to the other input of block 12 of comparison of codes from block 5 of the program, then at the output of block 2 of comparison of codes, a Scrap signal is formed prohibiting the fourth input element And 7, and at the same time Scrap signal falls into the control unit 4 and stops the operation of the device.

If the tripping voltage of the monitored relay is less than the tripping boundary voltage, then the output of control unit 3 appears. Signal Norm entering unit 4 controls. Thereby, the monitoring voltage control is terminated, and the control unit 4 is switched to the release voltage monitoring. According to the signal from control block 4, program block 5 outputs to the reversible counter 10 a code for the maximum value of the release voltage of the relay Uorn.max to the generator 6 pulses — a code for the release time t, to block 3 for control — a code for the threshold value of the release voltage .РР to block 12 code comparison - code zero. Element And 8 is allowed by three inputs and pulses with a follow-up period equal to t-., From the generator 6 pulses are fed to the reverse counting input of the reversible counter 10. At the moment of releasing the relay, the contact analysis section 9 causes the inhibit signal to the third input of the And 8 element In the reversible counter 10, the response voltage code of the controlled burner is fixed, the control unit 8 compares the release voltage coming from the converter 11 with the threshold value of the release voltage. The result of the anahgas is supplied to the control unit 4 .

If a relay with faulty contact groups is monitored (for example, a non-closure of a switching contact with a normally closed contact), the release time of the relay is not detected by the CONTEKToiB condition analysis unit 9, therefore the pulses from the generator of 6 pulses continue to flow through AND 8 to the reverse counting reverse input counter 10. When the reversible counter GO reaches the code O, the block 12 compares the codes and gives a signal. Scrap, which prohibits the AND 8 element and simultaneously enters the block 4 of the control, stopping devices.

In the device according to the invention, the Scrap signal is formed through the time determined by the expression

+ pa5-0. f,.-.- tcT

where Upgg.- is the value of the working item. So, with Upa (In

UCP 20 V zd 0.1 V, c.

30-1b

 - 7 with p 0.01

and in the known device, under equal conditions, after 22 s. g

Thus, the performance of the proposed device when detecting relays with defective contact groups compared to the known above is more than 3 times.

When a device fails, the proposed device reliably protects the winding of the monitored relay from overcurrent and voltage, and since it is possible to form a step-varying voltage, it can be used for multi-level tolerance control when sorting the relay by shelf life, along with the ability to determine the measurement of monitored parameters.

Claims (1)

Invention Formula A device for monitoring the parameters of electromagnetic relays, containing a switch connected by a first input to a device input, a voltage comparison unit connected by a first input to a switch output, a control unit followed by first outputs to the second inputs of a switch and a voltage comparison unit whose output is connected to the first input of the control unit, connected by the second output and the input, respectively, to the input and the first output of the program block, and the third inputs to the outputs of the contact state analysis unit, a single input with the second output of the program block, which is based on the fact that, for the purpose. The speed and reliability of the device, it contains a comparator and a reversible counter connected by one input to the third outputs of the program block and a pulse generator connected by the input to the fourth output of this block, two AND elements and a digital-analog converter, the output of which is connected to the third inputs of the switch and the unit is equal to the voltage, and the input is connected to another input of the comparator and connected to the output of the reversible counter, connected by its other inputs to the third output of the control unit and the element outputs The first inputs of which are connected to the output of the pulse generator, the second inputs are connected to the fourth input of the charging unit and the comparator output, the third inputs are connected to the outputs of the contact state analysis unit, and the fourth inputs of the AND elements are connected to the fourth outputs of the control unit.