JPH0642389Y2 - Nest for control equipment - Google Patents

Description

[Detailed Description of the Invention] <Industrial application field> The present invention relates to a nest for a control device, which is called a card, for accommodating a plurality of printed circuit boards, and more particularly to an improvement that enables maintenance work while the control device is operating. .

<Prior Art> In an industrial control device, a printed circuit board called a card is provided corresponding to an operation end and a detection end to perform an operation as a controller and an operation as an indicator. The number of cards is increased or decreased depending on the size of the controlled object. A nest accommodates a predetermined number of cards, and if the size of the controlled object is large, a large number of nests are housed in a cabinet called a cubicle, and a small one requires only one nest.

FIG. 4 is a perspective view showing the configuration of a conventional nest for control equipment.
In the figure, a cubicle 10 has a rear mounting column 11 having an L-shaped cross section, an intermediate mounting column 12 provided on a side surface, a front mounting column 13 also provided on a side surface, a bottom plate 14 provided on a bottom surface, and a top plate on an upper surface. It is composed of a top plate (not shown) provided and a support fitting 15 having an L-shaped cross section, which is attached to the side surfaces of the mounting columns 11 to 13 at substantially right angles to form a substantially rectangular parallelepiped. The nest 20 is attached to the support fitting 15, accommodates a predetermined number of cards 30 each having a printed circuit board on which an electronic circuit and the like are mounted, and has a power supply unit 31 that supplies electric power required for the operation of these cards 30. At the same time, it has a card unit 30 and a fan unit 40 for radiating heat generated by the power supply unit 31.

<Problems to be solved by the invention> In such a device, the fan unit 40 may fail, but in this case, it is necessary to remove the cable supplying the commercial AC power to the power supply unit 31. It was For this reason, the function of the entire nest 20 is stopped, and there is a problem that it is not preferable in an application such as an industrial instrument which is expected to operate at the north top for 24 hours.

The present invention solves such a problem, and an object of the present invention is to provide a nest for a control device capable of performing maintenance work on a fan unit 40 while supplying power to the nest 20.

<Means for Solving the Problems> The present invention that achieves such an object includes a nest (20) having a substantially rectangular parallelepiped shape, and a card (30) provided with an electric circuit inside the nest provided in front of the nest. , A power supply unit (32) attached to this nest for supplying electric power necessary for the operation of the card, and a fan provided on the upper surface of the nest for generating a forced air flow for discharging the heat generated by the card and the power supply unit. A nest for a control device having a unit (40) has the following configuration.

That is, a terminal block (27) provided on the lower surface of the nest and connected to a power supply line (50) connected to an external commercial power source or a DC power source, and a connector with a first cable (33) for feeding power to the power source unit. ) And a second connector (34) with a cable for supplying power to the fan unit, the first and second connectors with a cable branch the power line through the terminal block, and the fan unit is also provided. And a power receiving connector (42) to which the second connector with cable is detachably connected. When the fan unit is removed from the unit, the power receiving connector and the connector with the second cable are unwound, and power supply to the power supply unit is continued by the connector with the first cable. .

<Operation> Since the fan unit is powered by the connector with the second cable, it is possible to remove the connector with the second cable from the power receiving connector and remove it from the nest during maintenance work. On the other hand, since the power supply unit is supplied with power from the connector with the first cable, each card continues to operate during maintenance work of the fan unit, which is preferable.

<Example> The present invention will be described below with reference to the drawings.

1 is a configuration perspective view showing an embodiment of the present invention, FIG. 2 is a configuration diagram of the apparatus of FIG. 1, (A) is a plan view, (B) is a front view, and (C) is a side view. Is. In FIGS. 1 and 2, components having the same functions as those in FIG. In the figure, stopper faces 21 for accommodating the fan units 40 are provided on three sides above the nest 20. Rack-mounting brackets 22 having an L-shaped cross section are provided on both right and left side surfaces of the nest 20 and are screwed to mounting columns 12 and 13 (not shown). When the nest 20 and the cubicle 10 are electrically insulated from each other, the insulating push 23 is attached to the screwed portion. A wiring receptacle 24 is attached to the left side of the bottom of the nest 20 to prevent the wiring connected to the cards 30 in each stage from being covered by the nest 20 in the lower stage when using the nest 20 in multiple stages. If 20 is a single stage, it can be removed. Mounting screws 25 are provided on both the left and right sides of the wiring receiver 24 and are used for mounting on the nest 20. Two screws 26 are provided on the lower side of each card 30 and are used for determining the ground of an internal electronic circuit.
On the right side of the bottom surface of the nest 20, there is provided a terminal block 27 to which a power supply line 50 from a commercial AC power source or another DC power source is connected. The connector 28 connected to this terminal block 27 is the nest 20
Are connected inside.

The number of cards 30 that can be accommodated in the nest 20 can be increased to a maximum of 12 here, but for example, 4 cards are common to each nest 20 (CPU card, memory card, communication card, power card), and the other 8 cards A control unit, a monitoring unit, an input / output card, etc. are mounted according to the control target. Here, for the power supply card 32, an AC-DC converter or a DC-DC converter is selected depending on the type of power supplied. A cable 33 with a connector is used to connect the power card 32 and the connector 28. Further, the power supplied to the cable with connector 33 is supplied to the power supply card 32 and is branched and output as it is to the cable with connector 34 (see FIG. 3).

The fan unit 40 is attached to the upper side of the nest 20, and here, two fans 41 are provided on the side of the power supply card 32. This fan 41 includes a power supply for driving inside,
Electric power is supplied from a cable 34 with a connector connected to the connector 42 to generate a forced air flow necessary for cooling.

The maintenance work of the device thus constructed will be described below with reference to FIG. When the fan unit 40 needs to be replaced, the connector-equipped cable 34 is removed from the connector 42, and the fan unit 40 is pulled out to the front side of the nest (direction of arrow A). At this time, the power card 32 has a cable with a connector.
Since the necessary power is supplied from 33, the card 30 continues its operation. Normally, the time required for repairing the fan unit 40 is short, and therefore, even if the card 30 operates without the fan unit 40 during this period, there is little risk of adversely affecting the life of the card 30. When the repair is completed, the fan unit 40 is attached to the nest 20 and the connector-equipped cable 34 is connected to the connector 42 to resume normal operation.

The length of the cables 33, 34 with connectors is
It is recommended to make it slightly longer than the interval with 42 to facilitate connection work.

<Effect of Device> As described above, the present invention has the following practical effects.

Since the power supply line 50 is independently connected to the power supply card 32 and the fan unit 40 by using the first and second connectors with cables, power is supplied from the power supply card 32 to the card 30 even when the fan unit 40 is repaired. Secured and useful for online maintenance work.

Since the terminal block 27 is provided on the lower side of the nest, the connectors with cables 33 and 34 do not interfere with the fan unit 40 even when the fan unit 40 is pulled out, and the pulling out operation can be easily performed.

[Brief description of drawings]

1 is a configuration perspective view showing an embodiment of the present invention, FIG. 2 is a configuration diagram of the apparatus of FIG. 1, (A) is a plan view, (B) is a front view, and (C) is a side view. , FIG. 3 is an explanatory diagram of an equivalent circuit. FIG. 4 is a perspective view showing the configuration of a conventional nest for control equipment. 20 …… Nest, 27 …… Terminal block, 28,42 …… Connector, 30
…… Cards, 32 …… Power cards (units), 33,34…
… Cable with connector, 40… Fan unit, 41…
…fan.

Claims (1)

[Scope of utility model registration request] 1. A nest (20) having a substantially rectangular parallelepiped shape, a card (30) provided on the front of the nest and having an electric circuit mounted therein, and an electric power required for the operation of the card attached to the nest. In a nest for control equipment having a power supply unit (32) to be supplied and a fan unit (40) provided on the upper surface of the nest and generating a forced air flow for discharging the heat generated by the card and the power supply unit, Terminal block (2) that is connected to the power supply line (50) provided on the bottom surface and connected to external commercial power or DC power supply
7), a connector with a first cable (33) for supplying power to the power supply unit, and a connector with a second cable (34) for supplying power to the fan unit. These first and second connectors with a cable Disconnects the power line via the terminal block, and provides a power receiving connector (42) to which the fan unit and the connector with the second cable are detachably connected, and remove the fan unit from the unit. When removing, the power receiving connector and the second connector with a cable are unwound, and the power supply unit is continuously fed with the first connector with a cable.