SU1539896A1 - Device for remote control - Google Patents

Abstract

The invention relates to electrical engineering and is intended for remote control of magnetic actuators in explosive environments. The purpose of the invention is to increase reliability by controlling the presence of supply voltage and the operability of the on and off circuits. The device contains a transformer, to the secondary winding of which a DC relay is connected, one output of which is connected via a serially connected switch key, made in the form of a transistor and a turn-on signal source, a switch key, made in the form of two transistors, three resistors, an optocoupler and a turn-off signal source and a diode with a different DC relay output. The device provides switching on and off of the starter, as well as monitors the voltage on the secondary winding of the transformer, monitors the passage of control commands (start and stop), which allows the operator to more quickly recognize emergency situations when controlling the magnetic starter. 1 il.

Description

The invention relates to electrical engineering and is intended for remote control of magnetic actuators in explosive environments.

The purpose of the invention is to increase reliability by controlling the presence of supply voltage and the operability of the on and off circuits.

The drawing shows the electrical circuit of the device.

The remote control device comprises a transformer 1, a direct current relay 2, a ballast resistor 3, a first transistor 4, a second transistor 5 of a switch-off key, a switch-key transistor 6, a diode 7,

resistors 8-10, optocoupler 11 switch off key. The start and stop control signals are received respectively at the base of transistors 12 and 13 of the sources of the on and off signals. The output of the control device is the phototransistor of the optocoupler 11.

Relay 2 is connected to the secondary winding of transformer 1. The collector of transistor 6 is connected to the first output of relay 2, to the first output of the ballast resisGtor 3, through a resistor 8 to the collector of transistor b, through a resistor 10 to the anode of the diode of the optocoupler 11, the cathode of which is connected to transistor base 5. Emitter

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Transistor 6 is connected to the collector t | of the transistor 4 and the second output of the ball. Resistor 3 The emitter of transistor 4 is connected to the anode of diode 7, the cathode of which is connected to the emitter of transistor 5 through the common wire of the actuator control circuit. .

The device works as follows.

In the initial state, the transistors

6,12, 13 are closed, transistors k, 5 are open. DC relay 2 is not turned on, as the current through the ballast resistor 3 is not enough to turn it on. The current in the base circuit of the transistor i ensures the inclusion of the optocoupler 11.

When a start command is applied to transistor 12, transistors 6, 12 open, shunt the ballast resistor 3 which leads to the switching of dc current relay 2, the current through transistor 4 also increases, the voltage drop across the diode increases

7, an additional negative feedback occurs on the emitter of the transistor 5, which leads to a decrease in the base current of the transistor 5 and the switching of the optocoupler 11. After the turn-on impulse, the transistors 6, 12 close. Through the ballast resistor 3, a current is established which holds the direct current relay 2 in the on state. When a stop command is received at the input of the transistor

13, the base of the transistor 5 is short-circuited by the transistor 13. When this is removed, the optocoupler 11 is turned off and the transistors 4, 5 are closed. The current circuit is opened and the direct current relay 2 is turned off.

Thus, the base current of the transistor S responds to all three states of the control circuit: the presence of voltage, the arrival of the Stop command, the arrival of the Start command, and the optocoupler 11 controls the controllability of the start

Katel: voltage control on the secondary winding of the transformer 1 (presence of voltage on the starter); monitoring the absence of a break in the cable connecting the magnetic starter and the remote control device; control of passing control commands (Start or Stop).

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The formation and subsequent transfer of these informational signs allows the operator to more quickly recognize emergency situations when controlling the magnetic starter. For example, if the optocoupler 11 is in the on state, then the control circuit and starter are in good condition. When control commands are received, the optocoupler 11 switches, signaling to the operator about the health of the circuits between the operator and the output of the remote control device.

Claims (1)

Invention Formula A remote control device containing a transformer, to the secondary winding of which a Pd switch is connected to a DC relay, the first pin of which is connected via a serially connected switch key, a switch key and a diode to the second pin of the DC relay, a ballast resistor connected in parallel to the switch key, characterized in that, in order to increase reliability by controlling the presence of supply voltage and the correctness of the on and off circuits, the switch is turned on or made in the form of a transistor and source the turn-on signal and the switch-off key are made in the form of two transistors, three resistors, an optocoupler and a switch-off signal source, the first output of the DC relay is connected to the collector of the switch-on transistor, through the first switch-resistor to the collector, and through series-connected second resistor, photodiode of the optocoupler and the third switch-off resistor - to the base of its first transistor, the emitter of which is connected to the base of the second transistor of the switch-off key, the collector of the transistor connected to the emitter the switch on key and the emitter of the diode connected to one of the leads; the switch on signal source is connected between the collector and the switch key base of the transistor, and the switch off signal source is connected between the emitter of the second transistor and the common pin of the second resistor and the photodiode of the switch off optocoupler.