JP2007267507A - Position indicating circuit of drawer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position indicating circuit of a drawer device for reducing a manufacturing cost of the drawer device, and also reducing a manufacturing cost of the entire facility if a plurality of the drawer devices are used for the facility using a distribution panel. <P>SOLUTION: If a switch device of the drawer device is in an operation position, an interlock contact S1 is turned on, a position limit switch LS3 is turned on, and an operation position indicating lamp R3 is turned on. If the switch device is drawn in a test position, the interlock contact S1 is turned on, the position limit switch LS3 is turned off, and an test position indicating lamp R4 is turned on. If the switch device 1 is not in the operation position and the test position, i.e. while the switch device is pushed in and pulled out, the interlock contact S1 is turned off, and the operation position indicating lamps R3, R4 are turned off regardless of an on/off state of the position limit switch LS3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a position display circuit for a drawer-type device in which an opening / closing device is placed on a carriage, and an operation position and a test position of the drawer-type device that is taken in and out of a switchboard are displayed by a lighting device or the like.

FIG. 3 is a circuit diagram of a position display circuit of a conventional drawer type device. FIG. 4 is an internal side view of a switchboard in which a conventional drawer-type device is accommodated.
The switchboard 10 shown in FIG. 4 has a vertical rectangular parallelepiped shape, and two partition plates 11 that also serve as a ground metal are horizontally disposed inside and divided into three unit chambers. In these unit chambers, a drawer type device 20 is accommodated as shown in the middle unit chamber.

The drawer-type device 20 includes a cradle 3 fixed on the partition plate 11, and a side L-shape mounted on the cradle 3 so as to be movable in the front or back direction of the switchboard 10 (left and right direction on the paper surface). And a switchgear 1 such as a vacuum circuit breaker mounted and fixed on the carriage 2.
The switchgear 1 is connected to the main circuit terminal 5 of the switchboard 10 through the contact 4 at the operation position P1. Further, the carriage 2 can be pulled out from the driving position P1 in the front direction and arranged at the test position P2.

  The cradle 3 includes a position limit switch LS3 that is turned on at the operating position P1 of the switchgear 1 and a position limit switch LS4 that is turned on at the test position P2. As shown in FIG. 3, each of the position limit switches LS3, LS4 is a c-contact switch connected to the commercial AC power supply terminals R, T. When turned on, the operation position display lamp R3 or the test position display lamp R4 Lights up. Each of the display lamps R3 and R4 is attached to the front of the switchboard 10 as shown in FIG. 4, for example, so that the operator can easily recognize the operating position P1 or the test position P2 of the switchgear 1.

  Further, the cradle 3 is provided with an interlock device in the A portion. This interlock device prevents the operation of the carriage 2 when the opening / closing device 1 is closed by the mechanical mechanism at the operating position P1, and also according to the operating position P1 or the test position P2, and other positions. At the test position P2, the switchgear 1 is opened by the mechanical mechanism so that the switchgear 1 cannot be closed at an intermediate position of the carriage 2 by the interlock contact that is turned on / off in conjunction with the mechanical mechanism that operates. In this closed state, the operation of removing the carriage 2 cannot be performed.

For example, Patent Documents 1 and 2 disclose position display circuits of this type of conventional drawer-type equipment.
Japanese Patent Laid-Open No. 10-108324 JP-B-2-41244

However, in the position display circuit of the conventional drawer-type device, two position limit switches LS3 and LS4 are required to display the operation position P1 or the test position P2 of the switchgear 1. Since LS4 is expensive, there is a problem that the manufacturing cost of the drawer-type device increases accordingly.
When such a high-price drawer-type device is used in a power distribution facility using a power distribution board in a factory or the like, there arises a problem that the manufacturing cost of the entire facility increases as the number of used devices increases.
The present invention has been made in view of such a problem, and can reduce the manufacturing cost of the drawer-type equipment, thereby reducing the manufacturing cost of the entire equipment when a plurality of the drawer-type equipment is used for the equipment using the switchboard. An object of the present invention is to provide a position display circuit for a drawer-type device that can be lowered.

  In order to achieve the above object, a position display circuit for a drawer-type device according to claim 1 of the present invention includes a cradle fixed in a switchboard, a movable opening / closing device detachably set on the cradle, Turns on when the switchgear is at either the operating position set in the cradle or the test position at a predetermined distance from the operating position, and the switchgear is not closed when it exists outside the operating position or test position. One or a plurality of drawer-type devices having an interlock contact that is turned off to make it possible are accommodated in the switchboard, and the display means displays that the accommodated switchgear is in the operating position or the test position. The position display circuit of the drawer type device is provided with a limit switch for position detection that is turned on when the switchgear is in the operating position and turned off otherwise. When the switch and the interlock contact are both on, the display means displays that the switchgear is in the operating position, and when the limit switch is off and the interlock contact is on, the display Means that the switchgear is present at the test position, and the limit switch, the interlock contact and the display means are powered so that the display means is not displayed when the interlock contact is off. It is characterized by being connected between terminals.

  According to this configuration, it is possible to display the operating position or test position of the switchgear using one limit switch for position detection, so two conventional limit switches are dedicated to each of the operating position and test position. Compared with the case where it uses, the manufacturing cost of a drawer-type apparatus can be reduced. If this type of drawer-type equipment is used in a distribution facility using a distribution board at a factory, etc., the larger the number used, the lower the manufacturing cost of the entire equipment compared to using conventional drawer-type equipment. It becomes possible.

  As described above, according to the present invention, it is possible to reduce the manufacturing cost of the drawer-type equipment, thereby reducing the manufacturing cost of the entire equipment when a plurality of drawer-type equipment is used for the equipment using the switchboard. There is.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, parts corresponding to each other in all the drawings in this specification are denoted by the same reference numerals, and description of the overlapping parts will be omitted as appropriate.
FIG. 1 is a circuit diagram of a position display circuit of a drawer type device according to an embodiment of the present invention. FIG. 2 is an internal side view of the switchboard in which the drawer-type device of the present embodiment is accommodated.

  The position display circuit of the drawer type device shown in FIG. 1 has an interlock contact S1 and a position limit switch LS3 connected in series to a terminal R of commercial AC power terminals R and T, and the movable terminal of the position limit switch LS3 is connected to the terminal R. When the position limit switch LS3 is turned on when the operation position P1 is detected, an operation position display lamp R3 is connected between one fixed terminal connected to the other commercial AC power supply terminal T, and the position limit switch LS3 is turned off. The test position display lamp R4 is connected between the other fixed terminal and the commercial AC power supply terminal T which are sometimes connected. Each display lamp R3, R4 constitutes a display means.

As shown in FIG. 2, the interlock contact S1 is generally attached to the switching device 1 as an interlock device of the drawer-type device 30, and the position limit switch LS3 is also the cradle 3 as in the conventional configuration described above. Is provided.
That is, the interlock device is provided in the portion A shown in FIG. 2 as already described, but as a component of the interlock device, as described in the conventional example, the opening / closing device 1 is placed at the midway position of the carriage 2. The closing operation is impossible. For this reason, when the carriage 2 is other than the operation position P1 and the test position P2, the interlock contact S1 is turned off so that the switching device 1 cannot be closed. In other words, when the carriage 2 is mechanically fixed to the driving position P1 or the test position P2 by the interlock device, the interlock contact S1 is turned on, and the opening / closing device 1 can be closed.
The position display circuit of the drawer-type device shown in FIG. 1 of the present embodiment uses the existing interlock contact S1, and is turned on at the operating position P1 among the two position limit switches LS3 and LS4 that are conventionally required. Only the position limit switch LS3 was used, and the circuit was configured with the display lamps R3 and R4.

The operation of the position display circuit of the drawer-type device having such a configuration will be described.
First, when the carriage 2 is at the driving position P1, the interlock contact S1 is turned on and the position limit switch LS3 is turned on, so that the driving position display lamp R3 is lit. Accordingly, it can be recognized that the opening / closing device 1 is located at the operation position P1.
On the other hand, when the carriage 2 is at the test position P2, the interlock contact S1 is turned on, but the position limit switch LS3 is turned off, so the test position display lamp R4 is lit. Thereby, it can be recognized that the switchgear 1 is located at the test position P2.

  Further, when neither the operation position P1 nor the test position P2 is present, that is, while the carriage 2 is being put in and out, the interlock contact S1 is turned off, so that each display is performed regardless of the on / off state of the position limit switch LS3. The lamps R3 and R4 are turned off. As a result, it can be recognized that the switchgear 1 is not located at either the operating position P1 or the test position P2.

According to such a position display circuit of the drawer type device of the present embodiment, since one position limit switch LS3 may be used to display the operation position P1 or the test position P2 of the switchgear 1, The manufacturing cost of the drawer-type device 30 can be reduced as compared with the case where the two are used.
If the draw-out type equipment 30 with reduced costs is used in a power distribution facility using a switchboard in a factory or the like, the manufacturing cost of the entire equipment is lowered as the number of use increases, compared to using the conventional draw-out type equipment 20. It becomes possible.

It is a circuit diagram of the position display circuit of the drawer | drawing-out type apparatus which concerns on embodiment of this invention. It is an internal side view of the switchboard in which the drawer | drawing-out type apparatus of this Embodiment was accommodated. It is a circuit diagram of the position display circuit of the conventional drawer-type apparatus. It is an internal side view of the switchboard in which the conventional drawer-type apparatus was accommodated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Opening / closing device 2 Carriage 3 Cradle 4 Contactor 5 Main circuit terminal 10 Switchboard 11 Partition plate 30 Pull-out type device S1 Interlock contact LS3 Position limit switch R3 Operation position display lamp R4 Test position display lamp P1 Operation position P2 Test position

Claims (1)

A cradle fixed in the switchboard, a movable switchgear that is detachably set on the cradle, an operating position where the switchgear is set on the cradle, and a test position that is a predetermined distance away from the operating position. One or more drawer-type devices having an interlock contact that is turned on when the switch is present and other than the operation position and the test position, and the switchgear cannot be closed when the switch is present. In the position display circuit of the drawer-type device that displays on the display means that the stand is housed and the accommodated opening / closing device is present at the operating position or the test position,
It includes a position detection limit switch that is turned on when the switchgear is in the operating position, and is otherwise turned off, and when both the limit switch and the interlock contact are on, the display means Displaying that the switchgear is present in the operating position, and displaying the switchgear present in the test position on the display means when the limit switch is off and the interlock contact is on, and the interlock contact A position display circuit for a drawer-type device, wherein the limit switch, the interlock contact and the display means are connected between power supply terminals so that the display means is not displayed when is turned off.

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