JPH0156603B2 - - Google Patents

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a load control device.

[Background technology]

Figure 1 is a schematic configuration diagram of a water pumping system using a load control device according to the present invention, in which 1 is a lower tank to which tap water is supplied from a city water pipe 2, and 3 is a lower tank installed on the roof of a building to supply water to each residential unit. An upper tank is supplied with water through a pipe 3a, 4 is a water pump that sucks up water from the lower tank 1 into the upper tank 3 as needed, 5 is an electric motor for driving the pump, and the upper tank 3 and the lower tank 1 are equipped with electrodes for water level detection. E ₀ to E ₄ and E ₀ ′ to E ₃ ′ are provided. 6 is a load control device, with an electrode for water level detection at the input terminal.
E ₀ to _{E 4} , E ₀ ′ to _{E 3} ′ are connected, and a control output for turning on and off the motor 5 is output to the output terminal. The water pump 4 is controlled accordingly. Figure 2 shows a load control circuit 6a and a display circuit 6b.
This shows a specific circuit example of the load control device 6 consisting of I ₀ to I ₄ , I ₀ ′ to _{I 2} ′ are water level detection electrodes E ₀ to _{E 4} ,
Input terminals to which E ₀ ′ to E ₃ ′ are connected, Ia and Ib′ are power input terminals, O ₁ and O ₂ are output terminals to which excitation coil MC of the electromagnetic contactor 7 that turns on and off the motor 5 is connected, and Tr is a power transformer, Ry ₁ to _{Ry 7} are control relays, S ₁ to _{S 2} are relay drive thyristors, DB
is a diode bridge, LD ₁ to _{LD 6} are operation indicator lamps consisting of LEDs, B is a warning buzzer, SW is a manual and automatic switching operation switch, r _M is a magnetic contactor 7
The contacts r ₁ to _{r 7} are the contacts of the control relays Ry ₁ to _{Ry 7} .

Now, the input terminals I ₀ to I ₄ of the load control circuit 6a,
Water level detection electrodes E ₀ to E ₄ input to I ₀ ′ to I ₂ ′,
Depending on which one of E ₀ ′ to E ₃ ′ is shorted,
Predetermined thyristors S ₁ to S ₇ are turned on and control relays Ry ₁ to _{Ry 7} are driven, forming a control output for the electromagnetic contactor 7 that turns on and off the drive motor 5 of the pump 4, and outputs the control output to the output terminal O ₁ , output to _O2 . On the other hand, the display elements LD ₁ ~ of the display circuit 6b
The LD ₆ is designed to display the operating status of the water pump 4, the water level status of the lower tank 1 and the upper tank 3, and the like.

By the way, conventionally, the load control circuit 6a and display circuit 6b of the load control device 6 used in the above-mentioned pumping system were mounted on one board 11 as shown in FIG. This has disadvantages in that the wiring length becomes longer and the wiring becomes complicated and difficult, and the area of the board 11 increases, so the load control device 6 is disposed inside the control panel. The disadvantage is that it requires a large amount of space.

[Purpose of the invention]

The present invention has been made in view of the above points, and it is an object of the present invention to provide a load control device that has simplified wiring and requires less installation space.

[Disclosure of the invention]

(Structure) As shown in FIG. 4, the load control device of the present invention includes a rectangular cylindrical case 10 whose lower surface is the mounting side;
The lower opening of the rectangular cylindrical case 10 is covered from below, and an input terminal for inputting a control input and an output terminal for outputting a control output to a load are provided on one side protruding from one side wall of the rectangular cylindrical case. At the same time, a control board 11a is mounted with a load control circuit 6a that outputs an output signal based on an input signal from an input terminal to an output terminal, and a control board 11a is installed in the upper opening of the rectangular cylindrical case 10 in parallel with this control board 11a. A display operation circuit 6 is covered from above and wired to the control board 11a to display the operating state of the load control circuit 6a and to change the operating conditions of the load control circuit 6a.
The display operating board 11b is mounted with a display operating board 11b, and a surface plate 20 covers the display operating board 11b except for display means and operating means, and closes the upper opening of the rectangular cylindrical case 10. This ensures electrical insulation when the device is installed, ensuring safety.Moreover, space can be used more effectively, making the device more compact, and maintenance work such as inspection and confirmation, as well as board replacement work, can be done easily. This can be done without removing the board, and input/output terminals for connection during construction can be provided on the outside of the rectangular cylindrical case 10, thereby simplifying the assembly work.

(Embodiment) FIGS. 5 to 8 show an embodiment of the present invention, and FIG. 5 shows the control panel box 8 of the load control device 6.
9 in the figure is a breaker, an electromagnetic contactor 7 for turning on and off the motor 5 is provided below the breaker 9, and a load control device 6 is provided on the door 8a of the control box 8. Window 8 for viewing the display of
b is drilled.

6 is an exploded perspective view of the load control device 6, FIG. 7 is an external perspective view, and FIG. 8 is a side view. A recessed step 13a is provided for the
A power transformer Tr is attached to the inner wall of the rectangular cylindrical case 10. A control board 11 on which a load control circuit 6a such as control relays Ry ₁ , Ry ₂ . . . is mounted.
a is screwed onto a mounting bracket 14 provided on the side wall of the rectangular cylindrical case 10 with a screw 15, and an input/output terminal block 1 is attached to one end of the control board 11a.
6 has been installed. This input/output terminal block 16 has two
The terminals are arranged in tiers, with terminals to which a weak current is connected to the upper tier 16a and terminals to which a strong electric wire is connected to the lower tier 16b. Electric shock can be prevented by covering the The display operation board 11b on which the display lamps LD ₁ , LD _{2 .} . . and the operation switch SW are mounted is screwed onto a mounting bracket 17 provided on the side wall of the rectangular cylindrical case 10 with screws 18. ing. 19 is the control board 1
1a and the display operation board 11b, and is arranged along the side wall of the rectangular cylindrical case 10. Reference numeral 20 denotes a through hole 21a for exposing the meter section of the ammeter 13, and a through hole 21 for exposing the indicator lamps LD ₁ , LD ₂ . . . and the operation switch SW.
b, 21c are the perforated surface plates, and screws 2
It is screwed on at step 3. 22 is a name plate covered on the surface plate 20 with a name engraved near the display lamps LD ₁ , LD _{2 .} . . and the exposure holes 21 b ′, 21 c ′ of the operation switch SW; 21a, 21
b, 21c, and the through holes 21a', 21b' of the nameplate 22,
21c', a component exposure hole is formed. That is, the indicator lamp LD ₁ ,
LD ₂ ...The number of operation switches SW changes depending on the specifications, and the names often change. Therefore, as the surface plate 20, display lamps LD ₁ , LD ₂ ... Through holes 21b corresponding to the maximum number of operation switches SW are prepared in advance. ,2
1c is used, and the through holes 21b' and 21c' of the nameplate 22 are drilled according to the specifications, so that it is possible to deal with various specification changes simply by changing the nameplate 22. It is. In the embodiment, the name plate 22 is attached to the top plate 20, but it goes without saying that it may be fitted or screwed onto the top plate 20.

〔Effect of the invention〕

As described above, the present invention includes a rectangular cylindrical case whose lower surface is the mounting side, an input terminal that is covered from below at the lower opening of the rectangular cylindrical case, and outputs a control output to an input terminal into which a control input is input and a load. a control board equipped with an output terminal on one side protruding from one side wall of the rectangular cylindrical case, and mounted with a load control circuit that outputs an output signal based on an input signal from the input terminal to the output terminal; a display operation circuit that is covered from above in the upper opening of the rectangular cylindrical case in parallel with the control board and is wired to the control board to display the operating state of the load control circuit and to change the operating conditions of the load control circuit; It is composed of a display operation board on which is mounted, and a surface plate that covers the display operation board except for the display means and operation means and closes the upper opening of the rectangular cylindrical case. In this state, the internal electrical circuit is surrounded by the rectangular cylindrical case and the surface plate, ensuring electrical insulation and ensuring safety.Moreover, the function of the load control device is divided into the control board and the display operation board. Since it is divided and both boards are arranged vertically in parallel, the space can be used effectively and the device can be made smaller. In addition, since the control board is installed through the lower opening of the rectangular cylindrical case, and the display operation board is installed through the upper opening, there is no need to remove other boards during maintenance work such as inspection and confirmation, or during board replacement work. There is an effect that it can be done. Furthermore,
The input/output terminals are installed on one side of the control board that protrudes from one side wall of the rectangular cylindrical case, so the input/output terminals for wiring during construction can be installed on the outside of the rectangular cylindrical case, and the input/output Since no wires are connected to the terminals, the input/output terminals can be fixed by fixing the board and wiring can be done at the same time, which has the effect of simplifying assembly work.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of a pumping system using a load control device according to the present invention, Fig. 2 is a specific circuit diagram of the load control device, Fig. 3 is a top view of a conventional load control device, and Fig. 4 1 is an exploded perspective view showing the configuration of the load control device of the present invention, FIGS. 5 and 6 are external perspective views of an embodiment of the present invention, FIG. 7 is an exploded perspective view of the same, and FIG. 8 is a side view of the same. It is a diagram. 6a is a load control circuit, 6b is a display circuit, 10 is a rectangular cylindrical case, 11a is a control board, and 11b is a display operation board.

Claims (1)

[Claims] 1. A rectangular cylindrical case with the lower surface as the mounting side, and an input terminal that is covered from below to the lower opening of the rectangular cylindrical case, and an input terminal that inputs a control input and an output terminal that outputs a control output to the load, are connected to the rectangular tube. a control board mounted on one side protruding from one side wall of the shaped case and mounted with a load control circuit that outputs an output signal based on an input signal from the input terminal to the output terminal;
A display that is attached from above to the upper opening of the rectangular cylindrical case in parallel with the control board and is wired to the control board to display the operating status of the load control circuit and to change the operating conditions of the load control circuit. A load control device comprising a display and operation board on which an operation circuit is mounted, and a surface plate that covers the display and operation board except for display means and operation means and closes an upper opening of the rectangular cylindrical case.