SU957133A1 - Device for controlling and checking electric circuit faults - Google Patents

Description

(54) DEVICE FOR CONTROL AND MONITORING THE CORRECTION OF ELECTRIC CIRCUITS

one

The invention relates to electrical measuring equipment and can be used to create control devices and control the health of electrical circuits in process control systems.

A device for controlling electrical circuits is known comprising a power source, an actuator, a switch and a control circuit 1.

A disadvantage of this device is insufficient verification completeness.

The closest in technical essence to the invention is a device comprising a power source, the output of which is connected to one of the inputs of the operation mode selection unit, the other input of which is connected to one of the outputs of the program block, the control blocks, the first inputs of which are connected to the corresponding other outputs of the software the block, and the second inputs through the power buses with the output of the mode selector, and the actuators 2.

A disadvantage of the known device is the inability to control the health of the electrical circuits in the process of performing

technological operations and registration management teams.

The aim of the invention is to expand the functionality by providing the ability to monitor the health of electrical circuits in the process of performing technological operations and registering commands to control the actuators.

To achieve this goal, a device for controlling and monitoring the health of electrical circuits, which contains a power source, the output of which is connected to one of the inputs of the operating mode selector, the other input of which is connected to one of the outputs of the software unit, the control units, the first inputs of which are connected to the corresponding the other outputs of the program block, and the second inputs through the power supply lines — with the output of the operating mode selection block, and the executive 1 ”mechanisms, are equipped with a control block and shift elements with keys according to The actuators are connected to the outputs of the respective control units and to one of the inputs of the corresponding keys, the outputs of the elements of the displacement are connected to the inputs of the corresponding actuators and to other inputs of the corresponding switches whose outputs are connected to the corresponding inputs of the control unit, output which is connected to the input of the program block.

At the same time, the control unit is equipped with pulse formers according to the number of actuators and recorder, whose inputs are connected to the corresponding input terminals, and the outputs of the pulse formers are combined and connected to the output terminal.

In addition, diodes are used as bias elements.

FIG. 1 shows a structural electrical circuit of the device; in fig. 2 is a structural electrical circuit of the control unit.

The device contains a software unit, 2-1, 2-2, ... 2-p control units, actuators 3-1, 3-2, ... 3-p, operating mode selection unit 4, power supply sources 5, buses 6 meals, elements 7-1, .... 7-p offsets, keys 8-1, 8-2, ... 8-p and control block 9.

The control unit 9 includes drivers 10-1, 10-2, ... 10-n pulses and the recorder II.

The device works as follows.

All control operations are carried out under reduced voltage on the feed tires. The magnitude of this voltage should be insufficient for actuating the actuators 3-4, ... 3-n, but acceptable for keeping them in working condition after applying full voltage to them. This condition is quite feasible, since the minimum required voltage for actuating actuators, such as electropneumatic valves, is 2–3 times the value of m, the excimer voltage for releasing these mechanisms. Relays of electronic keys 8-1, 8-2 ... 8-p are chosen, based on the requirements of their stable switching on both at low and full voltage on the power supply buses 6.

Each of the formers 10-1, ... 10-n pulses of the control unit 9 converts potential signals arriving at its input into two voltage pulses, which are generated respectively when a signal is received and removed, i.e. along its front and rear edges.

In the initial state, all blocks 2-4, ... 2-n controls are turned off, their command relays are de-energized, and actuators 3-4, ... 3-n are disconnected from power supply buses 6. Transistors of electronic switches 8-1, ... 8-p are closed, and the windings of their control relays are de-energized.

To carry out a test control, before turning the device into operation, the control unit 1 is supplied with a control signal at the input of unit 4, and the voltage on the power supply buses 6 is reduced to

insufficient for actuating actuators 3-1, ... 3-p. According to the program recorded in block 1, the alternate (within one cycle) operation of all blocks 2-1, ... 2-n control is performed. Each interrogated circuit is connected to the supply bus 6 with the help of the closing contacts of the relays included in the control units. A current appears in the circuit of the actuator, for example 3-1, which creates a voltage drop across the bias element 7-1 (diode). Due to this voltage drop, a potential signal is supplied to the input of the imager 10-1 of the block 9, which is converted into a voltage pulse, which is then applied

to the input of program block 1. At the same time, the presence of a potential signal is recorded by the recorder 11. After switching off the control block 2-1, key 8; -1 is closed. When removing the potential signal from the input of the imager 10-1, the latter again

A voltage pulse is transmitted to the input of the program block 1. The presence of two pulses is perceived by this unit as the operability of the interrogated circuit. If the interrogated circuit is faulty, for example it has an open circuit, then the current in the circuit of its actuator

missing and the key will not open. If the interrogated circuit has a short circuit, voltage pulses do not arrive at the input of software block 1, which is detected by it as a device malfunction.

To perform technological operations, the control signal is removed from the input of block 4. A full voltage is applied to the bus 6, then program block 1 is put into operation, which, in accordance with predetermined algorithms, activates actuators 3-1, ... 3-p. After the formation of each control command, the program block checks the arrival at its input of a voltage pulse, which is the resultant signal of the health of the entire control circuit. At the same time, all changes in the state of the output circuits of the 2-1, ... 2-n control units are recorded by the recorder 11.

Monitoring of circuit health without stopping the process is carried out in the same way.

described

Claims (2)

For this, the device switches to monitoring mode, i.e. the voltage on the power supply tires 6 decreases. All previously activated actuators remain in working condition. Program block 1 polls the chains of those blocks 2-1, ... 2-n control, which will be involved in the work in the next cycle of technological operations. Claim 1. A device for controlling and monitoring the health of electrical circuits, comprising a power source, the output of which is connected to one of the inputs of the operation mode selector, the other input of which is connected to one of the outputs of the software unit, the control units, the first inputs of which are connected to the corresponding others the outputs of the software block, and the second inputs through the power buses - with the output of the operating mode selection block, and actuators, characterized in that, in order to expand the functionality We need to ensure that the electrical circuits are monitored in the process of performing technological operations and registering actuator control commands, it is equipped with a control unit and displacement elements with keys according to the number of actuators, and the inputs of the corresponding displacement elements are connected to the outputs of the corresponding control units keys. the outputs of the bias elements are connected to the inputs of the respective actuators and to the other inputs of the corresponding keys, the outputs of which are connected to the corresponding inputs of the control unit, the output of which is connected to the input of the program block. 2. The device according to claim 1, characterized in that the control unit is equipped with a pulse shaper according to the number of actuators and a recorder, the inputs of which are connected to the corresponding input terminals, and the outputs of the pulse shapers are combined and connected to the output terminal. 3. The device according to claim 1, characterized in that diodes are used as bias elements. Sources of information taken into account during the examination 1. USSR author's certificate No. 661426, cl. G 01 R 31/02, 1977. 2. USSR author's certificate for application number 2919343, cl. G 01 R 31/02, 07.05.80 (prototype). // / P I I .