SU1241298A1 - Relay device for switching two units in turn - Google Patents

Abstract

The invention can be used in devices for alternately switching on a sensor signal and contains a single normally open control contact, two units, for example, two reserved fans for uniform development of their resource. The purpose of the invention is to expand the functionality and increase reliability by ensuring the sustainability of the device without energy consumption. To achieve this goal, two two-input storage key elements 13 and 14, a resistor 25 and two neutral relays are introduced into the device. 7 and 8, as well as two three-input key elements 11 and 12 on transistors 15 and 16, resistors 17-22, diodes 23 and 24 ,, switching contacts 26, 27 and 28 of remote switch 1 with windings 2 and 3, shun-. diodes 4 and 5, process contact 29, make contacts 30 and 31 and 32, 33 relays 7 and 8, respectively, diodes 9 and 10, shunt relays. 1 il. SS (L

Description

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The invention relates to the automation of production processes and can be used in devices for alternately switching on a sensor signal with one normally open control contact of two units, for example, two redundant fans for uniform development of their resource.

The purpose of the invention is to enhance functionality and increase reliability by providing a steady state without energy consumption.

The drawing shows a circuit diagram of the proposed device.

The device contains a two-winding remote switch 1 with windings 2 and 3, shunted by opposite-connected diodes 4 and 5, the first terminals of windings 2. and 3 are connected to the negative first bus 6 of the power supply; two neutral relays, 7 and 8, also shunted by counter-switched diodes 9 and 10 and connected to bus 6; two three-input key elements P and 12, connected by their outputs respectively to neutral relays 7 and .8, the first inputs to the inputs of the corresponding two-input storage key elements 13 and 14, the second inputs cross with the first inputs of these elements, and the third inputs with the negative bus of the pin ani, and containing transistors 15 and 16, resistors 17-22 and diodes 23 and 24. In addition, there is a common resistor 25, switch, that pins 26, 27 and 28 of the remote switch 1, connected to the resistor 25 and two-way control inputs key memory elements 13 and 14, a control technology contact 29 connected to the combined inputs of elements 13 and 14, the first and second closing contacts 30 and 31 of the first relay 7 and the first and second closing contacts 32 and 33 of the second relay 8. Contacts 30 and 32 are connected in parallel to the positive bus 34 of the power supply and the first inputs of elements 13 and 14, and contacts 31 and 33 to the positive bus 34 and the corresponding windings 2 and 3 of the remote switch 1. Two-input key elements 13 and 14 are made on thyristors 35 and 36.

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The device works as follows.

In the initial state, the controller; the process contact 29 is open, 5 the position of the contacts 26-28 and 30-33 corresponds to that shown in the drawing and all elements are de-energized. When the control technology contact 29 is closed, the positive power supply bus 34 connects to the anodes of the thyristors 35 and 36 of the two-input storage key elements 13 and 14 and through a common relay 25, the start-up current limiter and the disconnecting contacts 26 and -27 of the remote switch 1 to the control electrode of the element thyristor 35. 13. Since the transistor 15 of the three-input key element 1 1 due to the presence of a negative bias across the base through the resistor I 8 is constantly prepared for opening, the element 13 and the transistor 1 5 open and the neutral relay operates 7. Resistors 17 and 19 (20 and 22 ) provide reliable operation of the transistor 15 (16) in the key mode. Closing its first contact 30, the relay 7 stands for self-blocking, shunt the control technology contact 29 and thereby eliminating the effect of possible contact oscillation 29 with the formation of a series of short pulses on the switching cycle of the entire device. The thyristor 35, having opened, remembers the activation signal The signal coming from the output of the element 13 is blocking for the element 12, since it acts through the diode 24 directly on the base of the transistor 16. Due to this, the transistor 16 is reliably locked and the relay 8 is de-energized. The closure of the second contact 31 of the relay 7 triggers the remote switch I on the winding 2 and switches the contacts

26 - 28 to the opposite steady state. As a result, the thyristor 36 of the two-input storage key element 14 also opens across the circuit: resistors 20 and 22 and minus 6 power supply, but transistor 16 remains closed and relay 8 de-energized. The signal is removed. from the output of the element 14, through the diode 23 it closes the transistor 15 of the element, 11 And lowers the relay 7, disconnects its contacts 30 and 31. When the contact 29 is opened, the thyristors 35 and 36 are closed, and the blocking signals are removed from the bases of the transistors 15 and 16.

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incoming through diodes 23n24, n the whole device goes into de-energized state. After tripping on coil 2, remote switch 1 closes its first contacts (not shown) to turn on the first unit. Upon the subsequent closure of the control technology contact 29, the thyristor 36 of the element 14 is first opened along the circuit: resistor 25 - contacts 26 and 28 - control electrode. In this case, the second neutral relay 8 is triggered, and the relay 7 is de-energized because the transistor 15 is closed by a positive signal supplied to. its base is through diode 23. The further operation of the device is similar to the indicated one. At the end of the switching cycle, the device is once again de-energized, and the remote switch I, triggered by winding 3, opens its first contacts, removes the command to turn on the first unit, and closes its second contacts (not shown) to turn on the second unit for uniform working out their resource. Thus, the proposed device eliminates the need to use a tee control technological contact, which significantly expands the functional capabilities of such a device, a significant portion of

sensors of technological parameters and regulating devices do not have triple switching contacts

In addition, this device has an increased operational reliability, since its elements are supplied with current only at the moment of switching of the control technological contact 29, remaining all the rest, the time of de-dividing

which is effective in operation.

At the same time, the device is protected against short and wireless contact 29, which can be formed during the transition of a technological parameter than, cutting the limit value, which is achieved by self-locking relays 7 and 8 (contacts 30 and 31).

The proposed device allows the use, in addition to postsc with control signals, to form 2.1 x k

EXT-Order 3604/47

Production polygr., Pr-tie, Uzhgorod, st. Project, 4

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ticks of the remote switch I, the pulse signals generated when the contacts are switched (not shown) of the neutral relays 7 and 8, which also expands the field of application of this device.

Since instead of a triple switching contact, one closing contact is used, it is necessary to connect two connecting wires to connect the device to the process variable sensor.

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Claims (1)

Invention Formula A relay device for alternately switching on two units containing a two-winding remote switch connected by the first leads of its windings to the first power supply bus, two three-input key elements, the first input of each of which is connected to the second input of the other, their third inputs are connected to the first power source bus power supply, the control contact connected by the first output on the second power supply bus, from the fact that, in order to expand the functionality and increase the reliability of the providing a steady state without energy consumption, introduced into it, two two-input. memory key elements, a resistor and two neutral relays, with the first inputs of two-input memory elements connected to the second output of the control contact and through parallel connected first closing contacts of two neutral relays. - to the second power bus, and through a resistor and switching contacts of the remote switch - to the second inputs of these elements, and their outputs are connected to the first inputs of the corresponding three-input key elements connected to their outputs through the respective windings of the neutral relays to the first power supply bus, / second The windings of the remote switch windings are connected through the corresponding second closing contacts of two neutral relays to the second power supply bus. Subscription