SU408280A1 - DEVICE FOR CONTROL RELAY - Google Patents

Description

one

The invention relates to automation and instrumentation technology and can be applied to control relays.

A device for controlling a relay is known comprising a pulse generator, the input of which is connected to the input of the input pulse counter and the first input of the selector, an input pulse counter and a time pulse automaton, the output of which is connected to the input of the load unit.

However, the known device is characterized by complexity and lack of reliability.

The aim of the invention is to simplify the device and increase the reliability of its operation.

For this purpose, a clock polling unit consisting of series-connected cells of monitored relays is entered into it, and a relay master, whose input is connected to the output of the pulse generator, and the output is connected to the relay winding of the first cell of the clock polling unit and through contacts and decoupling diodes of previous cells are connected to the windings of the second and subsequent cells of the clock polling unit, the output of which is connected to the input of the output pulse counter and to the second input of the selector, li ne output to the pulse generator and relays Setpoint.

The drawing shows a diagram of the device.

The device for controlling the relay contains a pulse generator 1, a time pulse machine 2, a selector 3, a load unit 4, a counter for output pulses 5, a setpoint relay, 6, a clock polling unit 7 and a counter for output pulses 8.

The device works as follows.

The principle of operation of the device is based on the principle of self-testing the relays tested by a method of sequential clock polling of input pulses from the pulse generator 1. The indication of gaps in the pulses and of the contacts of the failing relay is indicated by contact indicators, and the number of the failing relay is indicated by the indicator of the time pulse 2.

The indication of sticking of the contacts is made by the selector 3.

When a triggering pulse is applied to the winding of the first relay, it is activated and the winding of the subsequent relay is fed through its closed contacts, etc. During the one input clock pulse, the cells are polled.

After the clock pulse ends, the first relay turns off and breaks the power supply circuit of the winding of the second relay, the contacts of which

de-energize the winding of the third relay, etc. to the lth.

The load current circuit in the pause between input clock pulses is closed through sequentially connected disconnecting contacts of the tested relays, isolating diodes and disconnecting contacts of the temporary automatic switching device 2, and during the passage of the clock pulse, the load circuit is interrupted sequentially from the opening contact to the closing contact and vice versa, while the minimum time pulse automaton 2 does not work, since its delay time is longer than the flight time of the core.

The mode of operation of the circuit is determined by the frequency of the clock pulses and the resistance value in block 4.

The pulses of a given frequency from the pulse generator 1 are fed to the output pulse counter 5 and through the setpoint relay of 6 to the relay coil of the first cell of the clock polling unit 7, simultaneously through the setpoint relay 6 is fed plus power to the circuit.

When the first pulse arrives at the winding of the tested relay of the first cell of the clock polling unit 7, relay 9 operates and closes its closing contacts, and the switched current will flow through the following circuit: , the closing contacts of the relay 9 of the first cell of the clock polling unit 7 - the diode And the clock polling unit 7 - the diode 12 of the first cell of the temporary pulse automaton 2 - the disconnecting contacts of the relay 10 of the second cell of the temporary pulse machine 2 - disconnecting contacts of the relay 9 of the second cell of the clock polling unit 7 - diode 13 of the second cell of the clock polling unit 7, etc., successively through all the cells of the clock polling unit 7 and the temporary pulse machine 2 - load resistance of the load unit 4 - minus power source.

When the pulses pass through the contacts of the tested relays, the corresponding LEDs 14 or 15 will light up, indicating the pulse passing through the contact.

The pulses from the output / g-th cell of the clock polling unit 7 are fed to the counter of output pulses 8 and through the input diodes 11

and 13 to the selector 3, simultaneously to the input of the selector 3 receives the input clock pulses from the pulse generator 1.

In normal operation, pulses from the output of the nd cell of clock polling unit 7 and from the pulse generator 1 arrive at the input of the selector 3, while the key 16 of the selector 3 remains closed and the indicator 17 does not light up. In the case of sticking of the contacts of any relay to the input of the selector 3, no pulses will be received or a constant voltage will be applied, then the key 16 will open and the indicator 17 will light up, indicating a failure has occurred. In this case, by a constant LED illumination in the corresponding cell of the clock polling unit 7, it is possible to determine the failing relay and the number of the stuck contact.

When the impulse is lost or the contacts of the tested relays hang, the temporary automatic switch 2 is activated and disconnects the power supply circuit of the load. In this case, the operator can determine the number of the failing relay by the LED of the temporary pulse automaton 2, and by which output pulse counter 8 - at which pulse the failure occurred.

Subject invention

Device for controlling a relay containing a pulse generator, the output of which is connected to the input of the counter of input pulses and the first input of the selector, the output counter

pulses and a temporal pulse automat, the output of which is connected to the input of the load block, characterized in that, in order to simplify the device and increase the reliability of its operation, a block is inserted into it

clock polling, consisting of series-connected cells connected to the windings of monitored relays, and a relay master, whose input is connected to the output of the pulse generator, and the output is connected to the winding of the first relay and through a series-connected time pulse machine, closing contacts of the previous relays and isolating diodes of previous cells - to the windings of the second and subsequent relays, the output of the clock polling unit is connected to the input of the output pulse counter and to the second input of the selector connected by the output to the generator in pulse and point adjuster relay.