SU1644194A1 - Warning signalling device - Google Patents

Abstract

The invention relates to automation and signaling and can be used to provide a leading warning signal before starting individual machines or a complex of machines. The aim of the invention is to simplify and increase the reliability of the device. For this purpose, a device containing light and acoustic signaling devices, a time relay with closing and opening contacts, a blocking relay with a closing contact, a potentiometer, a switching element, a Start button, a rectifying element, the first current limiting element, a magnetic starter and power supply buses , the Stop button, the cumulative element and the second current-limiting element are introduced. After pressing the Start button and the operability of the light and acoustic signaling devices, the latter are turned on. After a time determined by the time relay, the light and acoustic warning devices are turned off and the magnetic starter is turned on. 1 il. (L

Description

The invention relates to automation and signaling and can be used to provide a leading warning signal before starting individual machines or a complex of machines.

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

The drawing shows a schematic of the device for warning.

The device contains a time relay 1 with a closing contact 2, a potentiometer 3, a blocking relay 4 with a closing contact 5, a disconnecting contact 6 of the time relay 1, a stop button

7, switching element made of seven-day 8, Start button 9, acoustic 10 and light 11 signaling devices, accumulative element made of capacitor 12, current limiting element made of resistor 13, closing contact 14 of intermediate relay 15, diode 16, Stop 17 button , the resistor 18 of the magnetic starter 19, the rectifier element made of diode 20, the current-limiting element made of resistor 21, the power supply bus 22 and 23.

The device works as follows.

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To start the machine, for example, the conveyor, briefly press the Start button 9. At the same time, I apply the unlocking voltage to the control electrode of the sevenistor. Semistor 8 is unlocked, and through potentiometer 3, acoustic 10 and light 11 signaling devices and time relay 1 are powered. When the acoustic 10 and light 11 alarm devices and their circuit are in good condition, the voltage taken from the middle output of potentiometer 3 is enough to turn on the blocking relay 4. The blocking relay

4includes its closing contact

5 shunts the start button 9.

When the warning signal time has expired, time 1 switches on, which closing contact 2 turns on intermediate relay 15 on starter 19, and break contact 6 breaks the control circuit of sevenistor 8. Speed sensor 8 closes and stops warning and light signals, de-energizes time relay 1. Due to the capacitor 12 and the resistor 13, the time relay 1 is turned off with a certain exposure time, which ensures that the intermediate relay 15 of the magnetic starter 19 is reliably turned on. After the intermediate relay 15 is turned on, it closes with ontact 14 by self-blocking through diode 16 and resistor 18.

The device stops working before switching on the actuator 19 by briefly pressing the Stop button 7, and stopping the conveyor by briefly pressing the Stop button 17 of the magnetic actuator 19. The potentiometer 3 moves to such a position that when the predetermined amount of acoustic 10 and light 11 alarms The voltage taken from the middle output of potentiometer 3 was sufficient to turn on the blocking relay 4. In case of acoustic failure 10 and light 11

Claims (1)

Signaling devices greater than a predetermined value or failure of their circuit reduces the current flowing through potentiometer 3, and the voltage taken from its middle output will not be sufficient to turn on the blocking relay 4 and there will be no permission to start. Invention Formula U five 0 five 0 A warning device containing a blocking relay, the first winding terminal of which is connected to the first potentiometer terminal, the second terminal of which is connected via parallel light and acoustic warning devices to the first power supply bus, the third potentiometer terminal is connected to the second winding relay winding terminal and to the first terminal switching element, the second output of which is connected to the second power supply bus and to the first output of the Start button, the second output of which is connected to By the first output of the closing contact of the blocking relay and through a series-connected disconnecting contact of the time relay, the rectifier element and the first current-limiting element are connected to the control terminal of the switching element, the closing contact of the time relay is included in the control circuit of the magnetic actuator, In order to simplify and increase the reliability of the device, a storage element is introduced into it, the second current limiting element and the Stop button, the first output of the time relay winding is connected to the first The power supply bus and via successively connected accumulative and second current-limiting elements are connected to the second terminals of the winding of the time relay and the potentiometer, the second power supply bus is connected via the Stop button to the second output of the closing contact of the blocking relay. 0 i 22 23