SU1160371A1 - Device for monitoring operation of a.c.electromagnets - Google Patents

Abstract

DEVICE FOR MONITORING ELECTROMAGNETIC OPERATION TRANSFER. FLUID CURRENT, containing an indication unit, a source of alternating current j with a first output via a current sensor connected to the first input of the device, and a second output to an information input of a key, an output connected to the second input of the device, and a control input to the first control output, the first input of the plug-in. to the starting u, the comparator, the first input connected to the source of the reference source for the yarn, and the BtopbiM -. With the output of a two-half-wave AIR V1TEL, an input of a current sensor connected to the output of the current sensor, that is, with the aim of ensuring the control of the time of the electromagnet to be monitored, an element is introduced into the device OR EXCLUSIVE OR, 11 Ver1 Element I, first, second I third triggers, pulse generator, OR element, delay element, first and second counters, and the control unit consists of a reset pulse generator, a second AND element, and a command signal generator, with a reset pulse driver not the first one, the input of the control unit and the first input of the second element I, and the output with the second step of the control unit; the second input of the second element I is connected to the second control input, and the output to the first input of the command signaling device, the second input and the output of the connected .Accordingly to the third input and the first output of the control unit, when (this is the third input of the control unit is connected to the second output of the AC voltage source, and the second output to the first input of the OR element and the installation input to zero p STARTING the first counter and the first trigger, the inverse output connected to the second input of the control unit, and the installation input to the 00 unit state - with the replenishment output of the first counter, the counting input of which is connected to the comparator output, the input of the delay element and the first input of the element ITS1 ID1 , BTopbtM input connected to the output element, delay and. the installation input to the unit state of the second trigger, and the output to the second input of the OR element, the output connected to the installation input to the zero state of the second and third triggers and the second counter, the output of the second trigger

Description

it with the first input of the first element I, the second input connected to the output of the pulse generator and the output to the counting input of the second counting output of which is connected with the input q of the installation of the third trigger, the direct output connected to the first input of the turkey 1 {oi, the second input of which is connected to the direct one of the first trigger, and the third inputs are connected to the outputs of the first counter.

. The invention relates to automation and instrumentation technology, which can be used to control the fact and time of operation of AC electromagnets. ;.:,. ., A device for monitoring electromagnet-alternating current, containing a current sensor. The 1K signal normalization circuit is connected, the comparator, one of whose inputs is connected to the output of the normalization circuit, and the other to the source of reference equipment, and the display unit {J. The drawback of the device is a low deactivation, due to the presence of an inertial filter element in the circuit . In addition, the device does not allow controlling the response time of the electromagnet. The closest in technical essence to the present invention is a device for monitoring electromagnetic AC relays containing an indication unit, an alternating current voltage source, a first output through a current sensor connected to the first input of the device, and a second output to a key information input, an output connected to the second input of the device, and the control input from the first output of the control unit, the first input connected to the start bus, a comparator, the first input connected to the source of the reference voltage, and the second input with the output of the full-wave rectifier, input. the house is connected to the output of the current sensor. The known device makes it possible to determine the currents of operation and release of the electromagnetic relays 2. A disadvantage of the known device is that it does not allow controlling the time of operation, as well as determine the fact of the operation of electromagnets that do not have their own contact groups. The purpose and benefit of the invention is to make it possible to control the time and fact of operation of the electromagnet. The goal is achieved by the fact that in devices for the Control of actuation of electromagnets of alternating current, containing an indication unit, an alternating current source, a nepiBbTM output through a current sensor connected to the first input of the device, and a second output to the information input of the key, output connected to the third input device, and a control input with the first output of the control unit, the first input connected to the start bus, a comparator, the first input connected to the output of the reference voltage source, and ring input to an output full-wave rectifier, an input connected to the output of a current sensor incorporated ISYUYUCHAVDEE OR element, the first element and the first, second and third flip-flops, the pulse generatsf, element or delay element. The first and second counters, and the control unit consists of a reset pulse shaper, a second AND element and a command signal shaper, the reset pulse shaper input connected to the first input of the control unit and the first input of the second And element, and the output to the second output of the control unit, the second input of the second element I is connected to the BTOpbiM input of the control unit 3

and the output is from the first input of the comaid signal generator, the second input and output of the connected one, respectively, to the third input and the first input of the control unit, while the third input of the control unit is connected to the second output of the AC voltage source, and the second output - to the first input . the OR element and the input to the zero state of the first counter and the first trigger, the inverse output connected to the second input of the control unit, and the unit setup input with the overflow output of the first counter, the counting input of which is connected to the comparator output, the input of the delay element and the first input of the EXCLUSIVE OR element, the second input of the support element connected to the output and the installation input into the single state of the second trigger, and the output to the second input of the OR element, the output connected to the installation input to the zero state of the second and third triggers and the second clock, the output of the second trigger is connected to the first input of the first element AND, the second input connected to the output of the pulse generator, and the output to the counting input of the second counter whose overflow output is connected to the installation input the unit state of the third trigger, the direct output connected to the first input of the display unit, the second input of which is connected to itpAhe M SH1PSODOM first trigger, and the third inputs are connected to the input of the first counter.

FIG. 1 shows a diagram of devices for monitoring the operation of ac electromagnets; in fig. 2-4 - timing diagrams, ref. «(Ie device operation.

The diagram shows the first input t of the y1p unit (directions, control unit 2, start-up bus 3, reset pulse shaper 4, second element I 5, control signal shaper 6, switch 7, electromagnet coil 8, current sensor 9, voltage source alternating current, two-full-period rectifier t1 pin, comparator 12, reference voltage source 13, delay element 14, element EXCLUSIVE ШШ 15, element ШШ 16, second trigger 17, general 603714

the torus 18 pulses, the first element And 19, the second counter 20, the third trigger 21, the first counter 22, the first trigger 23, block 24 of the indication. } FIG. 1-4, signals 25-45 are indicated; in FIG. 2-4 - the moments of time t, tj, t J and t4. , period of supply voltage T, period of impulses from comparator f, and period of impulses from generator T. .

 The device works as follows

In the initial state on the first input 1 of the control unit 2 the signal

f5 logical About from starting 1nina 3 (Fig. 2-4, time interval 0) At the same time, at the outputs of the shaper 4, a reset pulse, element 5 and shaper 6 of the command signal

20 zero output signals. The key 7 is in a non-conducting state, therefore the current in the circuit of the coil 8 of the electromagnet, the current sensor 9 and the source 10 of the AC voltage

5 is missing. The voltage at the output of current sensor 9 and the full-wavelength meter 11 is equal to zero. At the first output of the comparator 12, the voltage from the source 13 of the reference voltage, and at the second input, zero

The signal from the photocell is 11. At the same time, at the output of the comparator 12 there is a zero signal. At the outputs of the element 14 for the support, the element EXCLUSIVE ШШ 15 and the element OR 16 are also zero signals. The output of the second counter 17 is logical. In this case, the pulses from the generator 18 pulses through the element And 19 arrive at the counting input of the second counter 20.

The pulses from the overflow output of this counter go to the S input of the third trigger 21, without changing the single state of its output. On . the outputs of the first counter 22 and perg

 the first trigger 23 signals correspond to the results of the previous test, which are indicated by the display unit 24.

Upon admission from the starting tire

3 at the moment of time q (Fig. 2-4) of the signal of logical G (signal 25) the shaper 4 of the reset pulse generates one short pulse (signal 26), which resets

the triggers 17 (signal 27), 21 (signal 28), 23 (signal 29) and counters 20 (signal 30) and 22 (signals 31-34). At the inverse of the output of the first trigger 23 (signal 35), a signal of logical 1 is set, which is fed to the second input of element 5. At the first input of this element there is already a signal of logical 1 from the start bus 3. At the output of element 5, a signal of logical 1 appears which causes the appearance of the output signal 36 of the driver 6 only after the first passage through the voltage zero (signal 37) of the source 10 (Fig. 2 and 3, time t). The key 7 becomes conductive and the coil 8 of the controlled electromagnet receives the voltage from the source 10, the alternating current voltage. At the same time, the moment of opening the key 7 coincides with the beginning of the power voltage phage. This control mode is the most optimal, as the fuel and energy complex provides the maximum speed and increases the reliability of operation of the AC electromagnets. A transient process arises in the circuit of the coil 8 of a controlled electromagnet, characterized at the initial stage by a sudden surge of current. This is due to the fact that the inductive resistance of the coil 8 at the deflected position of the core is significantly less than at the fully retracted core. As the core moves, there is a decrease in the air gap, and therefore an increase in the inductive resistance and a decrease in the current. The shorthand current value corresponds to - Fully retracted koryu. From current sensor 9, the voltage (signal 38) proportional to its current in the coil of the electromagnet is fed to the full-wave drive 11, from which the output signal is a small signal. 39 is applied to the first input of the comparator f2. The voltage of the direct current (signal 40) from the source 23 of the reference voltage is supplied to the second input of the comparator 12. The magnitude of the reference voltage is chosen: a greater amplitude value of the voltage from the current sensor corresponding to fully retracted measles, in the comparison of the variable time signal 39 with a constant level (cHrHaj 40) at the output of the comparator 12 appears follower pulses (signal 41), which is formed until the voltage amplitude from the rectifier becomes less than the reference level, i.e. As long as the measles are not completely we nets. Therefore, the frequency breakdown at the output of the comparator 12 can be interpreted as the fact of the electromagnet triggering. The frequency cutoff is fixed by elements 14-21, which control the duration of the pulse following period from the comparator. - When the electromagnet core moves, the period f can take on any value, within 0.5 T f 0.75 T, where T is the period of the supply voltage frequency. When the next and post-next pulses are opened (frequency breakdown), the duration of the specified period is increased by 0.75-T. The control of the duration of the pulses generated by the comparator 12 is carried out as follows. The delay element 14 delays the front of the pulse from the comparator (signal 42, Fig. 4). The TIPPING STI 16 element generates a short pulse (signal 43), the duration of which is equal to the delay time of element 14. This pulse resets the second counter 20 and the triggers 17 and 21, the front of the pulse from the delay element 14 sets the second trigger 17 to one state. The signal of logic 1 from the trigger output .17 is fed to the first input of the element And 19, to the second input of which pulses are fed from the generator 18 (signal 44). These pulses pass to the output of the element And 19 (signal 45) and are fed to the counting input of the second counter -, ka 20. The frequency f of the pulses from the generator 18 and the capacitance NJ of the counter 20 must satisfy the condition Nj / f. 0.75-T. If the next pulse appears at the output of the comparator 12, the counter 2O with & fails to have time to Fill to the limit, therefore the signal 30 at its output overflow does not form a gap. If the next pulse is absent (frequency breakdown), the counter 20 & rises to the limit and an emulsion (phage 2-4, time t) is generated at the overflow stage, which enters the S input of the third trigger 21 and sets it to , 7. f is outside, which is a sign of the electromagnet srabapa. The first counter 22 counts the pulses generated by the comparator 12. The number of pulses formed by the comparator is equal to the number of half-waves of current with amplitude. The larger amplitude corresponds to the final position of the core. The time t Tp / 2, where T / 2 is the half-wave duration, the track, and n is the number of generated pulses, is approximately equal to the Electromagnet Tripping time. When the electromagnet fails due to a disturbance of the power supply circuit of the coil 8 of the electromagnet, the impulses B6, generally, do not fcrm. In case of incomplete operation (the measles did not reach its extreme "O" at the output of the comparator 12, a continuous sequence of pulses appears (Fig. 3, signal 44), but as a nerve counter 22 is filled at its output overflow. signal 34, time tj), which sets the first trigger 23 to one state (signal 29) fixing the fact that the electromagnet does not operate for some time tj "S T / 2, where NY is the capacitance of the nepjBoro counter 22. This time should not exceed the maximum allowable response time elect Omagnet. In the preFfer shown in Fig. 3. .J ;;., .-, -,: Swirling O from the inversion output of the first trigger 23 (signal 35) closes the AND element 5 As a result, at the output of the rotator 6 of the control signal set The TC of the electromagnet opens i Such a lock is blocking (a coil 8 is overheated and is burned when the ESM is not electrically operated: iit. . . . . . . -.; ;. The formation of pulses by the dagger 12 stops and at the moment 1 t the third trigger 21 fixes the breakdown of the frequency by setting the unit to one state. However, this signal cannot be regarded as a sign of srabatan since it appears simultaneously with the ghost signal at the output of the first trigger 22, fixing the fact that the electromagnet is not working. Various combinations of signals at the outputs of the first and third triggers, corresponding to different technical conditions of the electromagnet, are presented in the table. . , - l - Electromagnet technical condition Did not work (violation of coil power supply circuit) Did not work (measles did not reach extreme retraction) Srabrtal When all elements of the device are intact, such a combination is impossible Conversion of information from the outputs of the first counter 21, first rigger 22 and third trigger 20, a form convenient for visual observation is carried out by the display unit 4. Thus, the proposed device allows controlling the act and response time of electro-magnetic devices that do not have their own contact groups. In addition, the device protects the coil of the electromagnet from overheating and burning if the latter is not cracked.

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Claims (1)

DEVICE FOR CONTROLLING ELECTROMAGNETS TRANSFER -. VOLTAGE CURRENT, containing the indication unit, AC voltage source, the first output through the current sensor connected to the first input of the device, and the second output to the information input of the key, the output connected to the second input of the device, and the control input to the first output of the unit control, the first input connected to the start bus, a comparator, the first input connected to the output of the reference voltage source, and the second input to the output of a half-wave rectifier, the input connected to the output of the current sensor, from Personally, in order to provide the possibility of controlling the response time of the electromagnet, an EXCLUSIVE OR element, the first AND element, the first, second and third triggers, the Pulse generator, the OR element, the delay element, · the first are introduced into the device and the second counters, and the control unit consists of a reset pulse shaper, a second And element, and a command signal shaper, with a reset pulse shaper connected to the first input of the control unit and the first input of the second And element, and the output to the second output the control unit, the second input of the second AND element is connected to the second control input, and the output to the first input of the command signal shaper, the second input and output connected respectively to the third input and the first output of the control unit, while the third input of the control unit is connected to the second the output of the AC voltage source, and the second output with the first input of the OR element and the input to the zero state of the First counter and the first trigger, the inverse output connected to the second input of the control unit i, and with the input of the unit in a single state - with the overflow output of the first counter, the counting input of which is connected to the output of the comparator, the input of the delay element and the first input of the element EXCLUSIVE OR, the second input connected to the output of the element, the delay and the input of the unit to the single state of the second trigger, and the output is to the second input of the OR element, the output of the second and third triggers and the second counter connected to the input to the zero state, the output of the second trigger is connected to it with the first input of the first element And, with the second input connected, to the output of the pulse generator / and the output - to the counting input of the second counter * whose overflow output is connected ς the input of the unit in the single state of the third trigger, the direct output of which is connected to the first input of the display unit, the second input of which is connected to direct the output of the first trigger, and the third. inputs are connected to the outputs of the first counter. 1 .