JPH02188096A - Remote control relay - Google Patents

Abstract

PURPOSE:To display even the off state of the remote control relay by providing a photocoupler which illuminates to display an on/off state when driven by a terminal device for control. CONSTITUTION:The remote control relay 13 is provided with a photocoupler PC2 for off operation display in parallel to a photocoupler PC1 for on operation display. The light emitting diode LD2 of the photocoupler PC2 is connected in the opposite direction from the light emitting diode LD1 of the photocoupler PC2. Therefore, the photocoupler PC2 illuminates in the negative half cycle period of an AC power source AC while its auxiliary contact (r) is switched to the diode D2, thereby displaying the off state of the remote control relay 13. If coil wire breaking or a connection defect of coil breaking occurs, both the light emitting diodes LD1 and LD2 turn off, so the off state and fault of the remote control relay 13 can be recognized clearly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application 1 The present invention relates to a remote control relay used in a remote monitoring and control system.

[Prior Art] Conventionally, a remote control relay 13 used in a remote monitoring and control system is driven by a control terminal 3 connected to a central control device (not shown) through a signal line 4, as shown in FIG. controlled. In the control terminal 3, unique address data is set by the address setting section 14, and when the address data of the transmission signal received via the signal line 4 and the own unique address data match, the transmission signal control data is taken in, and the remote control relay 13 is driven based on this control data. Above remote control relay 1
3 operates using a voltage obtained by stepping down the AC power supply AC by a step-down transformer T as a power source, and switches a main contact (not shown) according to the direction of current flowing through the excitation coil 14. In this remote control relay 13, an excitation current is caused to flow through the excitation coil by conduction of any one of 5CEIQ, Q2, and the conduction control of these 5CRQ, Q2 is operated according to the output of the terminal device 3. This is done by the driver 16. In addition, the direction of current flowing to the excitation coil is regulated by an auxiliary contact connected in series with the excitation coil, and a diode that regulates the direction of current flowing to the excitation fill in one direction in response to switching of this auxiliary contact r. In other words, when the driver 16 triggers 5CRQ+Q2 to become conductive, which diode D
,,D, are connected to the excitation coil L by the auxiliary contacts, Kr, which determines whether the main contacts, α, are open or closed. Now, with the auxiliary contact r switched to the diode D1 side,
When the driver 16 triggers 5CRQ, Q2, 5CRQ turns on and the AC power supply AC is turned on for excitation filling.
An opening magnetic current of positive half cycle flows. This results in
The main contact is controlled to open or close, and at the same time, the auxiliary contact is switched to the diode D2 side. Therefore, when the driver 16 applies a trigger to 5CRQI and Q2, the AC power supply AC is applied to the excitation coil. A current flows in the opposite direction during the negative half cycle of , and the main contact is controlled to open and close in the opposite direction. Also at this time, the auxiliary contact r is switched to the guide D side. In this remote control relay 13, S CRQ
A photocoupler PC is connected in parallel with + and Q2,
When the auxiliary contact r is switched to the guide D, a light emitting diode LD is turned on, and the operating state of the remote control relay 13 is indicated by the lighting of the light emitting diode LD. In this remote control relay 13, when the auxiliary contact r is switched to the side of the diode D, the main contact is in the on state, and therefore the light emitting diode LD indicates the on state of the remote control relay 13. Then, when the light emitting diode LD of this photocoupler PC emits light, the lannostar PT turns on, and the terminal device 3
The remote control relay 13 is designed to send back an operation signal indicating that it is on. Therefore, the terminal device 3 can monitor the operating state of the remote control relay 13.

Note that when controlling the switching of the remote control relay 1 by the central control device, the operating state of the remote control relay 13 is checked in advance, and then the switching control of the remote control relay 1 is performed.

[Problem to be Solved by the Invention 1] By the way, in this conventional example, the on/off state of the remote control relay 13 can be displayed on the photocoupler PC, but it is possible to display the on/off state of the remote control relay 13 (for example, a disconnection of the coil or a poor contact of the auxiliary contact r). In this case, the light emitting diode LD of the photocoupler PC goes out in the same way as when it is off, so there is a problem that it is impossible to distinguish between the off state of the remote control relay 13 and a failure.

Furthermore, it was also impossible to distinguish between an off state and a failure of the terminal device.

The present invention has been made in view of the above points, and its purpose is to provide a remote control relay that can indicate a malfunction and can also recognize that a terminal is malfunctioning. .

[Means for Solving the Problems 1] In order to achieve the above object, the present invention displays the on and off states by lighting respectively when turned on and off by a control terminal, and also displays the lighting state. It is equipped with a photocoupler that sends the signal back to the terminal as an operating signal.

[Function 1] As described above, the present invention also displays the OFF state of the remote control relay, so that the OFF state of the remote control relay and the failure can be clearly distinguished and displayed, and an operation signal indicating this lighting state is transmitted. By sending the information back to the terminal, the terminal can also distinguish and recognize the off state and the failure.

[Example 1] First, the overall configuration and operation of a remote monitoring and control system will be schematically explained. In this remote monitoring and control system,
As shown in FIG. 2, a central control unit], a plurality of monitoring terminals 2 each having a unique address and monitoring switches SI to S, a control terminal 3 controlling loads 1 to L,
A wireless relay terminal 7, an external interface 7, an ace terminal 8, and a pattern setting terminal 9 are connected by a pair of signal lines 4, and transmissions sent from the central controller 1 to the signal line 4 are connected to each other by a pair of signal lines 4. As shown in FIG. 3(a), the signal Vs includes a start pulse signal ST indicating the start of signal transmission, and a mode data signal MD indicating the signal mode.

Address data signal A that transmits 8-bit address data for calling terminals 2, 3, 7-9 1. '), load, ~L, control data signal CD, checksum data signal C3, and terminal device 2, which transmit control data for controlling load, ~L,
, 3. A return standby signal W that sets the return period from 7 to 9.
It is a bipolar (±24■) time division multiplexed signal consisting of T.
Data is transmitted using pulse width modulation. When the address data of the transmission signal Vs received via the signal @4 and its own unique address data match, each terminal device 2, 3゜7-9 captures the control data of the transmission signal Vs, and The monitoring data signal is converted into a current mode signal (
The signal #i4 is short-circuited through an appropriate low impedance and sent back. Further, the central control device 1 includes a dummy signal transmitting means for constantly transmitting a dummy transmission signal with the mode data signal MD in a dummy mode, and either a monitoring terminal 2 or a wireless relay terminal 7 or an external interface terminal. 8. Figure 3 () returned from the pattern setting terminal 9
]) When an interrupt signal Vi as shown in
Detects the terminal device 2, 7 to 9 in which an interrupt has occurred and processes the terminal device 2.
Access 7 to 9 and send back the monitoring datatm')
and processing means are provided. The central control device 1 also includes the monitoring terminal 2 or wireless relay terminal 7, external interface terminal 8,
Based on the monitoring data sent back from the pattern setting terminal 9 to the central control device 1, control data is created to be transmitted to the control terminal 3 that controls the corresponding load, ~L, and the control data is The load, .about.L, is controlled by time-division multiplex transmission to the control terminal 3 via the signal #i4.

The wireless relay terminal 7 includes an optical wireless transmitter 10,
Optical wireless receiver 11 and wireless signal #112
This is a terminal device that relays data in an optical wireless system consisting of a wireless optical transmitter 10, which receives an optical signal emitted from an optical wireless transmitter 10 using an optical wireless receiver 11, and transmits the received data via a wireless signal line 12. At the same time, this data is transferred to the central control unit 1. Further, the external interface terminal device 8 is a terminal device that performs data transmission with the external control device 1i 8a, and the pattern setting terminal device 9 is a terminal device that performs data transmission with the external control device 1i8a.
This is a terminal device that transfers pattern control data input from the central control device 1 to the central control device 1. The monitoring terminal 2 and the control terminal 3 installed in the distribution board 6 or the relay control 4fl6a have the dimensions agreed upon by the distribution board, and their control output enables the remote control for load control. A relay 5 (a remote control relay that can be turned on and off using a hand switch) is controlled.

The remote control relay 13 of this embodiment will be explained below. In this remote control relay 13, as shown in FIG.
A photocoupler PC2 for displaying an OFF operation is provided in parallel with a photocoupler PC for displaying an ON operation. Note that the light emitting diode LD2 of this photocoupler PC2 is the same as the photocoupler PC1.
The light emitting diode LD is connected in the opposite direction. Therefore, in this photocoupler PC2, with the auxiliary contact switched to the diode D2 side, it can be lit during the negative half cycle period of the AC power supply AC to indicate that the remote control relay 13 is off. The output of the photocouplers PC, , PC2 is input to the signal processing section 15 of the terminal device 3 via the OR date 17.

During normal operation, the light emitting diodes LD, L of any of the photocoupler PC, PC2 are switched on according to the switching of the auxiliary contact.
D2 lights up. Now, if a coil breakage or a poor contact of the auxiliary contact r occurs, any light emitting diode LD,...
Since the LD2 is also turned off, it is possible to clearly distinguish between the off state of the remote control relay 13 and a failure. Further, at this time, the output of the OR gate 17 becomes low level, so that the terminal device 3 can recognize from this that the remote control relay 13 is out of order. At the time of this failure, the terminal 3
transmits data to the central control unit 1 indicating that there is a failure.

[Effect of the Invention 1] As described above, the present invention includes a photocoupler that lights up and displays the on and off states when turned on and off by the control terminal, so the off state of the remote control relay can also be controlled. This OFF operation display and ON operation display have the effect of clearly distinguishing and displaying the OFF state and failure of the remote control relay. Moreover, since the photocoupler sends back an operating signal indicating the lighting state to the terminal device, there is an advantage that the terminal device can distinguish between the off state and a failure.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a remote monitoring and control system, and FIG.
FIG. 4 is a circuit diagram of a conventional example. 1 is a central control unit, 3 is a terminal, 4 is a signal line, 131 is a remote control relay, and pc is a photocoupler. Agent Patent Attorney Ishi 1) Choshichi

Claims (1)

[Claims] (1) Connect the central control unit and multiple monitoring terminals and control terminals for which unique addresses have been set via a pair of signal lines, and access each terminal from the central control unit to collect monitoring data. It is used in a remote monitoring and control system that transmits time-division multiplexed control data, and when turned on or off by a control terminal, it lights up to indicate the on or off state, and uses this lighting state as an operation signal. A remote control relay with a photocoupler that sends the signal back to the terminal.