JPS6211168Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a remote control switch device that operates a power load switch device from a distance using low voltage signal communication wiring and displays the results of the operation on the operating side.

When remotely controlling a power load circuit, it is desirable that the operating circuit be safe, easy to operate, and not constantly carrying current. For this reason, recently, when controlling a simple load such as a light load that only requires opening and closing the main switch from a distance, it is possible to repeat the opening and closing operations alternately by simply passing an instantaneous current through the electromagnetic coil, and to switch the switch from the open position to the closed position. A mechanically held relay (hereinafter referred to as a keep relay), which is mechanically held in each case, is used as the main switch. When this keep relay circle is used, the operating circuit can be wired insulated from the main circuit via an isolation transformer, making it safe, and long wiring to distant places can be wired with thin and easily insulated wires, taking only safe current into account. It can be signal communication wiring. However, since this keep relay opens and closes the main switch by simply passing an instantaneous current through one electromagnetic coil, the operator cannot operate it unless he or she knows the open/close status. Therefore, an indicator lamp is provided on the operating side to display the open/closed status of the main switch. As described above, energy-saving remote control switch devices have recently appeared that are equipped with indicator lamps, but many devices still have complex circuits and require three or more wires to reach the operating circuit. FIG. 1 is a wiring diagram showing an example of a relatively superior conventional remote control switch device that eliminates the above-mentioned drawbacks. In FIG. 1, a main switch 3 inserted between an AC power source 1 and a load 2 forms a keep relay consisting of a switching type auxiliary contact 4 and an electromagnetic coil 5 that operate in conjunction with the main switch 3. coil 5
Two diodes 6a and 6b are connected at one end in opposite directions, and the other end is connected to the auxiliary contact 4 so as to be alternately switched, thereby forming a control circuit 7.
The operation display circuit 8 includes an indicator lamp 9 and a diode 10
and two diodes 12a and 12b connected in parallel so as to be switched in opposite directions by the changeover switch 11 are connected to the signal communication wiring 13. The isolation transformer 14 which receives the power supply 1 as an input has one end of the secondary output connected directly to the electromagnetic coil 5 and the other end connected to the common point of the auxiliary contacts 4 via the operation display circuit 8 via the signal communication wiring 13. .

Now, when the changeover switch 11 of the operation display circuit 8 is turned to the diode 12a side, a current flows in the direction of the diode 12a - changeover switch 11 - transformer 14 - electromagnetic coil 5 - diode 6a - auxiliary contact 4 (in the direction of the arrow shown by the solid line). The electromagnetic coil 5 is excited, the keep relay operates, the main switch 3 is closed, and the load 2 is activated.
is injected. Also, the auxiliary contact 4 is a diode 6b.
can be switched to the side. Then, the current flowing in the direction of the solid arrow is suddenly cut off, and the current flows in the direction of the diode 6b - electromagnetic coil 5 - transformer 14 - indicator lamp 9 - diode 10 - auxiliary contact 4 (in the direction of the arrow shown by the broken line). Indicator lamp 9 lights up and load 2
will be displayed. At this point, the changeover switch 11 is returned to the intermediate position. In this case, a current also flows through the electromagnetic coil 5, but since the indicator lamp 9 is inserted, this current is small and can be ignored if the number of indicator lamps 9 is small. Next, when the changeover switch 11 of the operation display circuit 8 is turned to the diode 12b side, a current flows in the direction of the arrow shown by the broken line except for the display lamp 9 and the diode 10, and the electromagnetic coil 5 is energized again, operating the keep relay and switching off the main switch. Open 3 and disconnect load 2. At the same time, the auxiliary contact 4 is switched to the diode 6a side, so no current flows through the indicator lamp 9 even if the changeover switch 11 is returned to the intermediate position and turned off. In other words, the indicator lamp 9 does not light up, indicating that the load 2 has been interrupted. As mentioned above, this remote control switch device can be operated by simply passing an instantaneous current through two signal communication wires via an isolation transformer, but as already mentioned, this current is kept when the indicator lamp is lit. flowing through the electromagnetic coil of the relay. Of course, if there are few indicator lamps, this current will be small and can be ignored, but if many operating circuits are installed and one main switch is operated from various locations, the number of indicator lamps will increase, and this current will increase and eventually the keep relay It has the disadvantage of causing malfunction.

The purpose of this invention is to eliminate the above-mentioned drawbacks and to provide a remote control switch device that uses two signal communication lines and allows many indicator lamps and therefore many operating circuits to be installed in parallel. do.

In order to achieve this purpose, this invention uses a main switch, which is inserted into a closed loop circuit consisting of an AC power source and a load, is switched on and off by an electromagnetic coil, and is mechanically held in the open or closed position each time, by the power source. In a remote operation switch device that is operated from a distance via an isolation transformer and displays the open/closed state of the main switch from a distance, one diode is connected to an auxiliary switch that is linked to the main switch, and the other diode is connected to the electromagnetic coil. A control circuit has two sets of diode circuits connected in series, each connected in antiparallel to each other, and a push button switch is connected to one diode, and an indicator lamp is connected in series to the other diode.
an operation display circuit in which a set of diode circuits are connected in antiparallel to each other, the operation display circuit and the control circuit are connected in series to the secondary circuit of the isolation transformer, and the auxiliary contact circuit and the display The lamp circuit is characterized in that the diodes are connected so that current flows in the same direction.

Next, this invention will be explained in detail based on drawings showing examples. In FIG. 2, a main switch 3 inserted between an AC power supply 1 and a load 2 forms a keep relay consisting of an auxiliary contact 4 and an electromagnetic coil 5 that operate in conjunction with the main switch 3. Diodes 6a and 6b are connected in series to the electromagnetic coil 5 and auxiliary contact 4 of this keep relay, respectively, and these circuits are connected so that the diodes 6a and 6b are antiparallel to form a control circuit 7. . The operation display circuit 8 has diodes 12a and 12b connected in series to the display lamp 9 and the pushbutton switch 11', respectively.
a and 12b are connected in antiparallel to each other. The isolation transformer 14 which receives the power supply 1 as an input has one end of the secondary output directly connected to one end of the control circuit 7 and the other end connected to the other end of the control circuit 7 via the operation display circuit 8 via the signal communication wiring 13. ing. Here, the diode 12b of the operation display circuit 8 must be connected in the same direction as the diode 6b connected in series with the auxiliary contact 4 of the control circuit 7 so that its current direction is the same. The operation display circuit 8 can be installed in two or more locations by extending the wiring, or the operation display circuit 8 can be installed in two or more locations.
It is also possible to separate the circuit 1' and the circuit of the indicator lamp 9 and install them at separate locations.

Now, when pushbutton switch 11' is pressed, pushbutton switch 11' - transformer 14 - diode 6a
- Current flows in the direction of the electromagnetic coil 5 and the diode 12a (in the direction of the arrow shown by the solid line), the electromagnetic coil 5 is excited, the keep relay operates, and the main switch 3
is closed and load 2 is applied. Then, auxiliary contact 4 closes, transformer 14 - indicator lamp 9 - diode 1
A current flows in the direction of 2b-diode 6b-auxiliary contact 4 (in the direction of the arrow shown by the broken line), and the indicator lamp 9 lights up. At this time, even if the push button switch 11' is released, this state is maintained.

Next, when the pushbutton switch 11' is pressed, the current flows again in the direction of the arrow shown by the solid line, and the electromagnetic coil 5 is energized again, which activates the keep relay.This time, the main switch 3 is opened and the load 2 is briefly cut off. Ru. At this time, the auxiliary contact 4 is opened, the circuit in the direction of the arrow shown by the broken line is cut off, and the indicator lamp 9 is turned off. This remote control switch device repeats the above operation every time the push button switch is pressed to close or open the main switch. And the indicator lamp shows this,
This current does not flow through the keep relay's electromagnetic coil.

As mentioned above, the remote control switch device of this invention is switched on and off using the secondary voltage of the isolation transformer connected to the power source by the same electromagnetic coil, and is mechanically maintained in the open or closed position each time. By using a main switch and distinguishing between the excitation circuit and the indicator light circuit by the connection direction of the diode, the current in the indicator light circuit is prevented from flowing into the excitation circuit. Therefore, there is no problem even if a large number of operation display circuits, that is, indicator lights are connected so that the main switch can be operated from various locations, and the main switch can be operated using two signal communication wirings.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram showing an example of a conventional remote operation switch device, and FIG. 2 is a wiring diagram showing an embodiment of the remote operation switch device according to this invention. 1... AC power supply, 2... Load, 3... Main switch, 4... Auxiliary contact, 5... Electromagnetic coil, 6a,
6b...Diode, 7...Control circuit, 8...Operation display circuit, 12a, 12b...Diode, 1
4...Isolation transformer.

Claims (1)

[Scope of utility model registration request] The main switch, which is inserted into a closed loop circuit consisting of an AC power source and a load, is switched on and off by an electromagnetic coil, and is mechanically held in the open or closed position each time, is operated from a distance by the power source via an isolation transformer. In addition, in the remote control switch device for displaying the open/closed state of the main switch from a distance, two sets are provided in which one diode is connected in series with an auxiliary contact linked to the main switch, and the other diode is connected in series with the electromagnetic coil. A control circuit has diode circuits connected in anti-parallel to each other, and two sets of diode circuits are connected in anti-parallel to each other, with a push button switch connected to one diode and an indicator lamp connected in series to the other diode. an operation display circuit, the operation display circuit and the control circuit are connected in series to the secondary circuit of the isolation transformer, and the diodes of the auxiliary contact circuit and the display lamp circuit are configured to supply current in the same direction. A remote control switch device characterized by being connected in a flowing manner.