SU446873A1 - Method for remote control of on-off object - Google Patents

Description

This invention relates to telemechanics.

A known method of remote control of a two-position object with the transfer of a command to turn on an object with the separation of half-periods of one sign of alternating voltage, supplying the communication line, & transmitting a control signal control point to perform the operation and using this signal to maintain the asymmetry of the alternating voltage in the communication line.

This method became widespread in the systems of remote control of mine shafts and mechanisms.

When implementing this method, as a device that reacts to the asymmetry of the line supply voltage and that acts on the object control, usually a direct current electromagnetic relay connected to the communication line is used, and

The control point is a push-button post with a built-in diode. Due to the flow of current through the diode and the resistor that shunt the start button, the asymmetry of the supply voltage in the line is constantly created, which, when properly configured, the relay should be insufficient to turn it on, but sufficient to keep the relay in the on state. Switching on the relay should occur at greater asymmetry of the supply voltage, when, in the process of transmitting the command to turn on the controlled object by closing contacts of the start button, the resistor is bridged and a half-period of one character of the alternating voltage supplying the communication line is selected.

This method has the following disadvantages:

I) the possibility of spontaneous activation of the controlled object

1 when the relay is misaligned;

2) Possibility of spontaneous shutdown of the controlled object;

3) there is no control over the execution of the .. command to turn on the object.

In order to control the control signal, the control signal is transmitted to the control point by cutting off the phase of the selected half-cycles of non-simultaneous voltage supplying the communication line.

On y; igla, b, c, the shape of the voltage in the communication line is correspondingly: in the absence of signals transmitted through the line, when the command is transmitted, the controlled object is not turned on, and the control signal is transmitted when the switch is turned on; On d: i, 2 shows a diagram of a device implementing the method.

on the control {.; ohm object from transformer 1 is powered by the alternating voltage of the communication line 2, 3, in parallel with which the electromagnetic relay 4 is connected and through the closing control terminal 5 of the switching control unit - device b, which performs the cut-off phase of half-periods filed on him nanr lshni.

At the control point, the Stop 7 button is connected in parallel to the line through the break contact: a series of Start 8 buttons connected in series and a diode 9, an input device of the receiving device 10, a thyristor 11, whose control junction is connected to the output terminals of the receiving device 10.

In the initial state, when the line is powered by alternating voltage, due to the large ind: resistance of the windings of relay 4, the current at its value is insufficient to operate the relay. Wired object is disabled.

The start button 8 push button start due to diode 9 is performed by passing half of the periods of one voltage sign, a thread that is being connected, as shown in Fig. 16. Under the action of a voltage-carrying current through the relay coil, it reaches a value sufficient to trigger it. In this case, Chshyand is sent to activate the controlled object.

When the controlled object is switched on to the main communication lines 2, 3, the transmitting device 6 is connected via the auxiliary contact, which transmits the phase out of the half-periods of the voltage applied to it

5 power, as shown in figv. The control signal generated in this way is transmitted to the control point, received by the device 10 and the potential signal

10 at its output is controlled by a thyristor il, which continues to cut off over (during the half-cycles of the alternating voltage in the communication system even after releasing the Start button 8.

15 In this case, the relay 4, receiving power asymmetric variables. voltage, continues to remain in the on state.

Thus, the control signal on the execution of the command to turn on the controlled object is transferred to the control point, the compartment, the phase of the voltage half-periods in the communication line, and this signal is used to maintain voltage asymmetry in the line.

The remote shutdown of the object is carried out for a short time with the stop 7 button pressed.

30 of this relay 4, receiving power from a symmetrical voltage, shuts down and, acting on the switching device, shuts down the controlled object. Blocking pin 5 transmitting

35, device 6 is disconnected from the gate of the communication line, and the circuit returns to its initial state.

SUBJECT OF MOBILE

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The method of remote control of a two-position object with the transfer of a command to turn on an object with the separation of half-periods of one character of an alternating voltage supplying the communication line, with a broadcast to the control point control point of the execution of the specified command and using this signal to maintain acMMfje three alternating voltages in communication, characterized in that, in order to increase the reliability of control, the translation of the co-signal of the control signal to a point; iitJai leiin is carried out by cutting off the selected half-period in pereivniogo voltage supply line CBHSi.-j

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