RU1830517C - Apparatus for electromagnetic relay operation control - Google Patents

Abstract

The inventive device contains a voltage source 1, an integrator 2, a voltage-current converter, four pulse shapers 4-7, three inverters 8-10, three elements And 11-13, three triggers 14-16, three indicators 17-19 , two switches 20-21, a pickup resistor 22, a common bus 23, terminals for connecting a relay 24-26. 1-20-2-3-24, 1-20-5-9-13-16-19, 23-22-21-7-11 (12.13) - 14 (15, 16) -17 (18), 26 -8-21-7. 2 ill. thirteen

Description

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The invention relates to measuring equipment and can be used to control the operation of electromagnetic relays during their production, as well as during adjustment work.

In FIG. 1 is a structural diagram of an inventive device for monitoring the operation current of electromagnetic relays; in FIG. 2 shows voltage diagrams illustrating the operation of the device.

The device for monitoring the response current of electromagnetic relays in its composition contains a voltage source 1, an integrator 2, a voltage-current converter 3. four pulse shapers 4,5, 6,7, three inverters 8,9,10, three elements And 11, 12, 13, three triggers 14, 15, 16, three indicators 17, 18, 19, two switches 20.21, current-limiting element 22, a common bus 23 and terminals 24, 25, 26 for connecting the winding 27 and contacts 28 of the controlled electromagnetic relay 29.

In the case of monitoring the response current of an electromagnetic relay with a normally open contact group, the device operates as follows.

Before starting work, the coil 27 of the monitored relay 29 is connected to terminal 24. and the contacts 28 are connected to terminals 25 and 26. The switch 21 is set to the position where the input of the pulse former 7 is connected to the input of the inverter 8. At the same time, the input of the former 7 with a common the device bus 23 through a current-limiting element 22 and a switch 21 receives a signal of the level of logical O. The electric potential is supplied from the output of voltage source 1 to the installation inputs of integrator 2 and triggers 14, 15, 16, determines their zero state. In this case, the current through the winding 27 of the relay 29 and indicators 17, 18, 19 does not flow. When the first switch 20 is switched, the positive signal of voltage source 1 is removed from the installation inputs of integrator 2 and triggers 14,15,16 and applied simultaneously to the inputs of three pulse shapers 4, 5 and 6, each of which generates a positive field pulse along the leading edge of the input signal durations of duration ta, ti and 12. respectively (see diagrams C, E and G shown in Fig. 2). The times ti and ta qoOTseTCTeyiOT are the lower and upper limits of the tolerance field of the relay trip current, and t2 is the average value of the tripping current. Inverters 9, 10 invert the output signals of the drivers 5 and 6, respectively. With the arrival of a positive signal at integrator 2, a linearly increasing voltage is generated at its output, which is fed to the input of voltage-current converter 3. Converter 3 ensures proportional correspondence to the input signal of the current flowing through the coil 27 of the controlled relay. Pulse former parameters 4, constant

integrator time data 2

the transfer coefficient of the converter 3 is set in such a way that during 1h the winding current 27 reaches a value greater than the trip current of any relay from the controlled batch. At the moment of operation of the relay 29 t, the contacts 28 are closed and through the switch 21 the electric potential from the output of the voltage source 1 is fed to the input of the pulse shaper

0 7, which forms a short positive signal (plot J). This signal is fed to the first inputs of the elements And 11,12, 13. The symbol indicates possible practical implementations during the monitoring of 5 "and the operation of the relay.

In the case when the time ti is less than ti (the response time of the monitored relay 29 is less than the lower tolerance limit), at the moment of arrival of the pulse to the first inputs of elements 11, 12, 13, a positive polarity signal will be present at the second input of element 11 (see diagram E ), which will ensure the passage of the signal to the counting input of the trigger 14, and at the second inputs of the elements

5 12,13 there will be a potential of logical zero (see diagrams H and G), which will block the receipt of a pulse at the counting inputs of triggers 15 and 16. As a result, trigger 14 goes into a single state (see diagram L) and lights up connected to indicator 17 is smaller. Indicators 18 and 19 will remain in their former zero state.

In the case when the time t.2 is greater than or equal to ti and less than or equal to t2 (the triggering time 5 of the monitored relay 29 is in tolerance), at the moment of arrival of the pulse to the first inputs of the elements And 11, 12,13 on the second and third inputs of the element And 13, there will be signals of positive polarity (see diagrams F and G), which will ensure the passage of the signal from the output of the pulse former 7 to the counting input of trigger 16. In this case, at the second inputs of elements 11, 12 there will be a potential

5 of logic zero (see diagrams E and H), which will block the receipt of a pulse at the counting inputs of triggers 14, 15. As a result, trigger 16 will go into a single state (see diagram H), and the indicator 19 associated with it will light up. Indicators 17, 18

while remaining in the previous zero state.

In the case when the time 1c is longer than t2 (the response time of the monitored relay 29 is greater than the upper tolerance limit), at the moment of the pulse arriving at the first inputs of the elements And 11, 12, 13 at the second input of the element 12 there will be a signal of positive polarity (see diagram H ), which will ensure the passage of the signal from the output of the shaper 7 to the counting input of the trigger 15. At the same time, at the second input of the element 11 and at the third input of the element 13 there will be a potential of logical zero (see diagram E and G). which will block the arrival of the pulse to the counting inputs of the triggers 14, 16. As a result, the trigger 15 will switch to the single state (see diagram P), and the indicator 18 connected to it will light up more. Indicators 17, 19 will remain in their former zero state.

After the time elapses at the information input of indicator 2, a logic zero signal appears (see diagram C), which fixes the value of the output voltage of integrator 2 and the corresponding current flowing through the winding 27 of relay 29. Current limitation necessary to prevent the load of the monitored relay 28.

After restoring the initial position, switch 20 (the upper one according to the drawing shown in Fig. 1), the positive signal from the output of voltage source 1 goes to the installation inputs of the integrator 2 and triggers 14, 15. 16. As a result, all the triggers: 4, 15, 16 and the indicators 17, 18 connected to them, 19 turn to zero state, the output voltages of integrator pa2 and the current flowing through i coil 2 of relay 29 fall to zero, the contacts are 28 pa. poke and device transition, g to the end; th state. At this point, the cycle of operation of the device for monitoring the operation current of electromagnetic relays ends.

In the case of monitoring the operation current of the relay with a normally closed group of contacts 28, the input of the pulse former 7 using the switch 21 is connected to the output of the inverter 8. In this case, in the initial state of the device, the voltage of the source 1 through the closed contacts 28 is fed to the input of the inverter 3, which ensures the formation of zero the signal at the input of the pulse former 7. When the relay 29 is activated, the input of the inverter 8 generates a signal of positive polarity. Otherwise, the device operates according to the algorithm described above.

Integrator 2 can be implemented on the basis of an operational amplifier, for example, type 140UD8. An emitter follower may act as a voltage-current converter. Single vibrators can serve as pulse shapers 4, 5, 6, 7. implemented on the basis of chips 133AG1. As inverters 8, 9, 10 and elements And 11. 12, 13 can be used circuits 133LA1, as triggers 14, 15. 16 - 133TV1. LEDs can serve as indicators.

An experimental verification of this device showed the possibility of providing two-sided tolerance control of the operation current of the electromagnetic relay with high accuracy and reliability.

FORMULA AND SECTION

A device for monitoring the response current of electromagnetic relays, containing a voltage source, an inverter, a first switch, three AND elements, three triggers, three indicators, terminals for connecting the winding and contacts of the controlled electromagnetic relay, while the voltage source output is connected via normally closed switch contacts with installation inputs of all triggers, and the output of each AND element is connected to the counting input of the corresponding trigger, the output of which is connected to the output of one of the indicators, In order to provide two-sided tolerance control of the operating current of the electromagnetic relay with high accuracy and reliability, an integrator, a voltage-current converter, four pulse shapers, two inverters, a second switch and a current-limiting resistor are introduced into the device, while the output the voltage source is connected to the terminal for connecting the contact of the controlled electromagnetic relay and through the make contacts of the first switch to the inputs of the first, second and third formations pulse generator, the output of the first pulse former is connected to the information input of the integrator, the output of which is connected via a voltage-current converter to a terminal for connecting the coil of a controlled relay, while the input of the first inverter is connected to a terminal for connecting a contact of a controlled relay, through a current-limiting resistor - with a common device bus and through the contacts of the second switch and the fourth pulse shaper - with the first inputs of all the elements And, and the output of the first inverter is connected to the input of solid formiro7 18305178

f

the pulse case through the contacts of the second is connected to the third input of the third e-switch. and the output of the second form And, and through the third inverter, with the second

The pulse voltage level is connected to the second input of the second AND element, while the output

the input of the first element And m through the second voltage source through disconnecting

inverter - to the second input of the third element5 the contacts of the first switch are connected

And, and the output of the third driver is impulse with the installation input of the integrator.