SU469957A1 - The device for conducting routine checks - Google Patents

Description

one

The device relates to the systems for monitoring and testing control systems and can be used to test the operation of control systems for distributed objects.

The known devices of the same designation contain a logic control unit, a power source, relay-repeaters connected to it with a contact in the circuit of the executive body of an object, the terminal contact of which is connected in series with the alarm relay with a lamp. These devices do not provide checks without special simulators and additional service personnel.

The proposed device is characterized in that it has a mode switch, a load switch and an additional normally open contact of the first repeater relay and a diode connected in series with an end point contact point and a signal relay. The mode switch terminals are connected to the output of the logic unit and the power source, and its moving contact is connected to the winding of the first repeater relay. The moving contact of the load switch is connected to a power source, and its terminals to the windings of the second and third repeater relays, normally open contacts of which are installed respectively between the power source and the contact of the first repeater relay and the power source and an additional contact of the same relay.

This reduces the laboriousness of the inspection by reducing the amount of equipment and maintenance personnel and reducing the time of the inspection.

The block diagram of the device shown in the drawing.

The device contains a logic unit 1, a control panel 2 with a load switch 3, a mode switch 4, a signal relay 5 with contact 6 in the signal lamp circuit 7. The movable contact of switch 3 and one of the terminals of the switch 4 are connected to the power supply 8, the second terminal of the switch 4 connected to the output of logic unit 1. Remote rack 9 is close to the object under test 10 and contains three repeater relays 11-13 connected to power supply B and, respectively, to the moving contact of switch 4 and the terminals of switch 3. Dio 14, one terminal connected to the common point of the signal terminal 5 and the relay contact 15 executive object 10, and the other - to the power supply through a series connection of normally open auxiliary contact 16 and contact 17 of the first 11 and third 13 relepovtoriteley. The executive unit 18 is connected to the power source via successively connected normally open contacts 19 and 20, respectively, of the first AND and the second 12 repeaters. The number of switches 4, relay-repeaters 11, diodes 14 and signal circuits (relay 5 and lamp 7) corresponds to the number of objects to be checked. In this case, the measles of the contacts 16 are assembled into a single point (calibration tire), and the measles of the contacts 9 are also combined into one point (the working tire). The device works as follows. When operating on object 10, switch 3 in control panel 2 is set to position I. At the same time, the second repeater relay 12 in remote stand 9 is under voltage and, with its normally open contact 20, connects the working bus to the power source. At this time, the repeater relay 13 is de-energized, its normally open contact 17 is open, and there is no voltage on the test bus. After switching on the device, logic unit 1 generates a command to the executive body of the control object through the mode switch 4, which is located in position I ("automatic operation"). The first repeater relay 11 is activated and closes its normally open contacts 16 and 19. Contact 19 turns on the actuator 18 of the control object, since the working bus is under voltage. As a result of actuation of the actuator, its end contact 15 closes, and applies voltage to the signal relay 5 on the control panel. Relay 5 is triggered, and its contact 6 turns on the signal lamp 7 on the mimic diagram of the control object, indicating the state of the executive body. At the same time, the contact 16 of the relay 11 does not affect the operation of the device, since the calibration bus is de-energized, and the decoupling diode 14 does not allow it to run from the end contact 15. During routine checks, switch 3 is set to position II. In doing so, relay 12 releases and opens its contact 19, as a result of which the working bus is de-energized. The relay 13 triggers and closes its normally open contact 17, which connects the calibration bus to the power source. After switching on the device, the first repeater relay 11 is activated and closes its contacts 16 and 19. But now the executive body 18 does not work, because the working bus is de-energized and its end contact 15 is not closed, and the auxiliary contact 16 of the relay I supplies voltage from the calibration bus through diode 14 to the signal relay 5. Relay 5 is triggered, and its contact 6 switches on the signal lamp 7 on the mimic of the control object, thereby simulating the actuation of the actuator. The operator, referring to the instruction, observes on a mnemonic the correct passage of an automatic operation. Upon completion of checking the logic unit 1, the operator sets the switch 3 to position I and then, setting the mode switch 4 to HI, performs one-time operation of the executive body 18, thereby checking the actual operation of the executive body, from the working bus through pin 19 and the executive body 18, and also from end contact 15 to relay 5. After that, the control system is considered to have completed the routine checks. The operator can intervene in the course of an automatic operation in emergency situations, set the switch 4 to the H position to forcibly shut down the actuator and to the III position to force it to be activated. The subject of the invention is a device for performing routine checks, containing its logic unit, power source, repeaters connected to one of its terminals, the normally open contact of the first of which is connected to the actuator, the end contact of the actuator in series and the alarm relay, the contact of which Included in the signal lamp circuit, characterized in that, in order to reduce the laboriousness of the checks, a mode switch, a load switch, and a series of switches are installed in it The connected additional normally open contact of the first repeater relay and a diode connected to the offensive end contact point and the signal relay; the switch modes are connected to the output of the logic unit and the power source, and its moving contact is connected to the winding of the first repeater relay; The moving contact of the load switch is connected to a power source, and its terminals to the windings of the second and third repeater relays, normally open contacts of which are installed respectively between the power source and the first relay receptacle and between the power source and an additional contact of the same relay.

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