JPS6258839A - Control center - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention comprises a plurality of unit devices in which main circuit devices for switching and protecting loads are grouped into unit circuits, which are housed in multiple stages in an outer box. Regarding the control center.

[Technical Background of the Invention] As is well known, a conventional control center includes an outer box 2 in which unit chambers 1 are formed in multiple stages, as shown in FIG.
A unit device 3 in which main circuit equipment for switching and protecting the load (magnetic contactor, wiring shield, etc.) is stored in the unit room 1 in a drawable manner for each unit circuit, and a front opening of each unit room 1. It consists of a door 4 with a window 4a provided in the section, and controls opening/closing, starting/stopping of the main circuit of an electric motor, etc.

It is designed to perform monitoring and protection operations. Therefore, on the front of each unit M3, there is an operation member 5 for opening and closing the electromagnetic contactor. A display and operation device 7 including an indicator light 6 and the like for indicating the operating state is installed, and this display and operation device 7 is provided so that it can be viewed and operated from the window 4a when the door 4 is closed.

[Background Art Problem 1 However, in the above conventional control center,
Since the display operation device 7 is provided for each unit device 3, the operability of the unit devices 3 located at high and low positions in the outer box 2 deteriorates, and it becomes difficult to check the displayed contents. In addition to this problem, there are also other problems such as making it difficult to replace the indicator light 6.

Furthermore, since the unit devices 3 are separated from each other by the doors 4, if drip-proof and dust-proof structures are required, these structures must be applied to each unit device 3 individually, which is extremely uneconomical. be.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a plurality of display operation devices that are paired with each unit device in a state where they are separated from the unit device so that the front side of the outer box By centrally arranging multiple display and operating devices, it is possible to improve the visibility and operability of each display and operation device, and also to simplify the structure when adopting a drip-proof and dust-proof structure. Even though the display and operation devices are arranged centrally on the front side, the number of connection wires connecting each unit device and display and operation devices can be significantly reduced, resulting in the simplification of the overall structure. The aim is to provide a control center for the performance of the project.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention includes a front door rotatably mounted on the front opening of an outer box formed of multi-stage unit chambers for storing unit devices. By centrally arranging a plurality of display and operation devices each equipped with a display means and an operation means for monitoring and operating the status of each unit device on this front door, the visibility and operation of the display and operation devices can be improved. In addition to improving operability, when a drip-proof and dust-proof structure is adopted, the structure only needs to be provided between the front door and the outer box. In order to send and receive signals, etc. between each of the display operating devices, a plurality of common busbars for transmitting signals, etc. are installed near the pivot point of the front door, and a command signal for driving the display means is transmitted to the front door. A first transmitting/receiving device for transmitting via a common bus and receiving an operating signal from the operating means via the common bus is provided in each unit device, and the operating signal from the operating means is transmitted via the common bus. A second transmitting/receiving device is provided in each display operating device for transmitting a command signal for driving the display means and receiving the command signal for driving the display means via the common bus, and further includes a second transmitting/receiving device for intermittently generating a synchronizing signal and receiving the command signal for driving the display means via the common bus. a counter circuit that counts the synchronization signals and generates an initialization signal every time the count value reaches a certain value and supplies it to the common bus; The device is initialized by the initialization signal applied via the common bus, and counts the synchronization signal also applied via the common bus at a unique timing for each paired unit device and display operation device. Timing circuits for generating time-division signals are provided, and the first and second transmitting/receiving devices perform transmission and reception in synchronization with the time-division signals from the timing circuits in the unit devices and display operating devices to which they belong, respectively. The key point is that by using the common bus bar in a time-sharing manner for each unit device and display operation device in a pair, the number of connection lines required to connect each unit device and display operation device can be greatly reduced. It is designed so that it can be reduced to

Embodiment of the Invention An embodiment of the present invention will be described below with reference to FIGS. 1 to 10.

First, in FIGS. 1 to 3 showing the mechanical configuration, 1
Reference numeral 1 designates an outer box having a vertically long rectangular shape. A front opening 11a is formed on the front side of the outer box, and a unit chamber 13 partitioned vertically by a number of shelf members 12 is arranged in multiple stages (this In the embodiment, it is formed in eight stages). Reference numeral 14 denotes, for example, eight unit devices that are housed in the respective unit chambers 13 in a drawable manner, and as shown in FIG. 3, these are circuit breakers 16. Main circuit equipment such as electromagnetic contactor 17 and main circuit disconnector 18. In addition to providing a control circuit disconnection section 19, a circuit board 20 is attached to, for example, the left side wall via a spacer 21, and from this circuit board 20 there are a required number of leads, for example, 14 leads I! A first plug 22 with j22a is led out. In addition, on the front side of the unit device 14, a security door 23 is provided with a side-opening structure via a hinge mechanism 24 to prevent hands or tools from easily touching the live parts and to prevent arc discharge. It is provided,
This security door 23 is formed with a window portion 23a through which the operating handle 16a faces in the closed state.

Now, on the outer box 11, a fixed panel 25 is fixed to the upper part of the front opening 11a, and a ventilation panel 26 having a ventilation opening 26a is fixed to the lower part. One front door 2 in the open part
7 is pivotally installed in a horizontally opening structure via a hinge ridge structure 28 attached to the left edge of the front opening 11a. Although not specifically shown in the drawings, this front door 27 has a gasket 29 (see FIG. 2) attached around its back side for the purpose of dustproofing, and a locking mechanism for locking it in the closed state. ing. Further, each unit device 14 is placed at an appropriate height position on the front door 27, for example, in the middle part.
A total of eight display operating devices 30, which are paired with the display operating device 30, are centrally arranged. The display operation device 30 includes a unit device 1.
For example, five indicator lights 31 are provided for displaying the operating status as display means for monitoring the status of item 4.
Operation means for operating the electromagnetic contactor 17, etc.!
For example, 5 (llil) operation switches 32 are provided.Furthermore, the back portion of each of the display and operation devices 2130 is exposed on the back side of the front door 27, and the rear portion of the display operation device 2130 is exposed on the back side of the front door 27. The same number of lead wires 22a led out from the circuit board 20 (1
A second plug 33 having four lead wires 33a is led out. On the other hand, 34 is, for example, 14 common bus lines,
This common generatrix 34 is a portion 34 attached to a portion near the front end edge (a portion near the hinge mechanism 28) on the inside of the left wall of the outer box 11 so as to extend vertically corresponding to each unit device 14.
a, a portion 34b attached to a portion on the back side of the front door 27 near the hinge mechanism 28 so as to extend vertically corresponding to the display operation device 30, and each of these portions 34a, 34b.
and a flexible transition portion 34C located between the upper ends of the two. A first connector 35 is provided in a portion 34a of the common bus bar 34 on the side of the outer box 11 so as to be close to and pair with the first connectors 22, of which there are eight in total. 22.3
5, the lead wire 22a and the common bus bar 3
4 are connected on a one-to-one basis. In addition, in the portion 341) of the common bus bar 34 on the front door 27 side,
A second plug 36 is provided adjacent to and paired with the second plugs 33, which are eight in total, and
When these plugs 33 and 36 are connected, the lead wire 33a and the common bus bar 34 are connected one-to-one. In this embodiment, each display operation device 30 and the lead wire 338 are also connected via the auxiliary plug 37.

The electrical configuration is shown in FIGS. 4 to 9, and will be explained below. However, in the following explanation, in order to facilitate understanding, these divisions will be indicated by adding subscripts a to h to each of the eight unit devices 14 and display operation devices 30 in order from the top. I did it.

That is, in FIG. 4 showing the overall configuration, numeral 38 is a synchronization signal generation circuit provided inside the outer box 11, which is the fifth synchronization signal generation circuit.
As shown in the figure, it consists of a square wave oscillation circuit 40 incorporating a crystal oscillator 39, and its relatively high frequency oscillation output is sent to one CLK line in the common bus 34 as a pulsed synchronization signal SC. Output. Reference numeral 41 denotes a counter circuit provided in the outer box 11 so as to directly receive the synchronizing signal Sc, as shown in FIG.
It consists of a 4-bit binary counter 42 that counts , and a NAND circuit 43 that receives signals from a total of four output terminals of this binary counter 42 . Therefore, in this counter circuit 41, every time the value of the binary counter 42 reaches a constant value N111J (in other words, the synchronizing signal S
The output of the NAND circuit 43 is inverted to a low level signal every time C is input for 16 pulses, and this low level signal is applied to one CLR line of the common bus 34 as an initialization signal 3i. It will be done.

44 is each circuit board 2o in the unit devices 148 to 14h.
As shown in FIG. 6, this is a power supply circuit provided in each of the transformers 45. It consists of a full-wave rectifier circuit 46 and a smoothing condenser 47 that rectify and smooth the secondary side output.
The smoothed output, that is, the low voltage DC output, is transmitted to two P lines (positive voltage side) and N line (negative voltage side) of the common bus 34.
Give in between. Reference numeral 48 denotes a timing circuit provided on each circuit board 20 in the unit devices 14a to 14h, which is supplied with power from the power supply circuit 44 and connected to the CL.
It is connected to receive the synchronization signal SC from the K line and the initialization signal 3i from the CLR line. Specifically, as shown in FIG.
Pitsu h binary counter 48a, 4 inverters 48b
.

It is constructed by connecting jumper terminals Ja, Jb, Jc, and Jd corresponding to the output terminals of the AND circuit 480 and the binary counter 48a as shown in the figure, and in particular, in this case, the data input terminal of the binary counter 48a. The output terminal of the AND circuit 48c is connected to the control line 49. Therefore, each jumper terminal Ja~J
By selecting the connection side of d as either the y terminal or the z@ terminal, a high level signal can be output to the control line 49 at any timing. That is, for example, in the timing circuit 48 in the first stage unit 14a, the count value of the binary counter 48a is rooolJ.
Each jumper terminal Ja-Jd is connected so that a high level signal is output from the AND circuit 48C when the binary counter 48a is inputted from the initialized state (when one synchronization signal SC is input from the initialized state of the binary counter 48a). Similarly, in each timing circuit 48 in the unit devices 14b to 14h, when the second, third, . . . The connection state of each jumper terminal Ja-Jd is selected so that a high level signal is output from the timing circuit 4.
8 to the control line 49 to the unit device 1 to which it belongs.
The configuration is such that a time division signal Sd (high level signal) assigned at a unique timing is output every 4a to 14h.

Reference numeral 50 denotes a first transmitting/receiving device provided on each circuit board 20 in the unit devices 14a to 14h, which receives power from a transmitting circuit 51 and a receiving circuit 52 provided to be supplied with power from the power supply circuit 44, respectively. Become. Further, 53 is, for example, five photocouplers provided on the circuit board 20, which are interposed in the input lines 511 to 515 of the transmission circuit 51, respectively, and are connected to the electromagnetic contactors 17 and 17 in the unit devices 148 to 14h.
A command signal @ (high level signal) for driving the indicator lamp 31 outputted from each auxiliary contact of an overload relay, a ground fault relay, etc. (none of which are shown) is received and provided to the transmitting circuit 51. Each of the above auxiliary contacts is turned on when the corresponding device is in an operating state to give the above command signal to the light receiving side of the corresponding photocoupler 53, and the photocoupler 53
When the above command signal is received, the corresponding line 511
~515 outputs the command signal. 54 is the circuit board 2
For example, five operation auxiliary relays are provided in the output line 5 of the receiving circuit 52 to
2+~525 and the negative side output line of the power supply circuit 44, the output lines 521~52! It is provided to be operated when a high level signal is output to (not shown)
Reset etc. Specifically, as shown in FIG.
．． The other input terminal of each ANI) circuit 55 is connected to the control line 49, and the output of each AND circuit 55 is connected to the control line 49. The terminal is connected to the common bus bar 34
It is connected to five D1 lines to D5 lines. Therefore, this transmitting circuit 51 is in an operable state only during the period when the time division signal Sd is output to the control line 49, and the input lines 511 to 51. The output (command signal) is given to the D1 line to D5 line. Further, the receiving circuit 52 specifically includes a D flip-flop 56 which receives outputs from the five D6 lines to DIG lines in the common bus line 34 at each data terminal, as shown in FIG.
It is composed of an 8-bit latch circuit 56 (only 5 bits are shown in the figure) consisting of an inverter 56b and an inverter 56b, and its enable terminal E is connected to the control line 49, and the first to fifth stages Each output terminal of the eye is connected to output lines 521-525, respectively. Therefore, this receiving circuit 52 is enabled to operate only during the period when the time-division signal Sd is output to the control line 49, and outputs from the D8 line to D1o line are sent to the output line 52.
21 to 525, and maintains the state when the time division signal Sd is no longer output to the control line 49.

On the other hand, 57 is a timing circuit provided in each of the display operation devices 30a to 30h, which is connected to the P line and the N line.
It is connected to receive power from the CLK line and to receive the synchronization signal Sc from the CLK line and the initialization signal Si from the CLR line. This timing circuit 57 is
Specifically, it has the same configuration as the timing circuit 48 (see FIG. 7), and by selecting the connection state of the jumper terminals Ja-Jd, the control line 58 is connected to the display/operation device 30a to which it belongs. The configuration is such that the time division signal Sd is outputted every 30h at a unique timing that coincides with the timing circuit 48 in the corresponding units @14a to 14h. 59 is a display operation device 30
A second transmitting/receiving device provided at each of a to 30h,
This consists of a transmitting circuit 60 and a receiving circuit 61, which are provided to be supplied with power from the P line and the N line, respectively.

Specifically, the transmitting circuit 60 has the same configuration as the transmitting circuit 51 (see FIG. 8), and its AND circuit 5
5, each one of the input terminals is connected to P via the input lines 601 to 605 each having the operation switch 32 interposed therebetween.
The other input terminals are commonly connected to the control line 58, and the output terminals are connected to the D6 line to the Dra line. Therefore, when the operation switch 32 is turned on, an operation signal (high level signal) is given to the corresponding AND circuit 55, and in the transmission circuit 60, the time division signal Sd is output to the control line 58. It is in an operable state only during the period in which the operation signal is applied to the D6 line to the p1o line. Further, the receiving circuit 61 specifically includes the receiving circuit 52.
(See FIG. 9), the enable terminal E is connected to the control line 58, and the output terminals of the first to fifth stages are output lines with the indicator light 31 interposed therebetween. The data terminals of the D flip-flop 56a are connected to the D1 line to the D5 line. Therefore, the receiving circuit 61 is enabled to operate only during the period when the time division signal Sd is output to the control line 58, and outputs from the D1 line to the Ds line to the output lines 611 to 61. The indicator lamp 31 is turned on when the output of the output lines 611 to 615 becomes a high level signal.

Next, the operation of the above configuration will be explained with reference to the timing chart of FIG. 10. When power is supplied from the control circuit disconnection section 19 to each power supply circuit 44 in the unit devices 14a to 14h, the output of the power supply circuit 44 is connected to the unit device 14.
Timing circuit 48.a to 14h. directly to the first transmitting/receiving device 50 and the display operating device 30
Timing circuit 57 within a to 30h. The signal is applied to the second transmitting/receiving device 59 via the P line and the N line, thereby driving these devices. In this state, power is also supplied to the synchronizing signal generation circuit 38 and the counter circuit 41, and the power is supplied to each of them as shown in FIG. 10(a).

A pulse-like synchronization signal Sc and an initialization signal Si as shown in (b) are output at a relatively fast cycle.

Then, the unit devices 14a to 14h and the display operation device 30
In the timing circuits 48 and 57 in a to 30h, the internal binary counter 48a is initialized in response to the input of the initialization signal Si, as shown in FIGS. At the same time, the operation is repeated in which the output from the binary counter 48a changes sequentially each time the synchronizing signal SC is input. and accordingly the tenth
As partially shown in FIGS. (Q) to (J), the timing circuit 48.
57, respectively, and each time the synchronization signal SC is inputted, the unit devices 14b to 14b of the next stage are sequentially output.
The timing circuits 48.57 in the 14h9 display operating devices 30b to 30h output the time-division signal Sd in time series. At this time, the unit devices 14a to 14h1 and the display and operation devices 30a to 3011 are each assigned the time division signal Sd at their own timing, and therefore the function is enabled only when the time division signal 3d is input. 1
The transmitting/receiving device 5o and the second transmitting/receiving device 59 are sequentially enabled for operation at a relatively quick cycle for each of the unit devices 14a to 14h1 and the display and operation devices 30a to 30h. That is, for example, when the time-sharing signal Sd is input to the first transmitting/receiving bag @50 in the unit device 14a and the second transmitting/receiving device 58 in the display/operating device SQa, the signal between the transmitting circuit 51 and the receiving circuit 61 is , each AND circuit 55 in the transmitting circuit 51 allows the command signal from the photocoupler 53 to pass only during the period in which it receives the time-division signal 3d, and at the same time, the latch circuit 56 in the receiving circuit 61 outputs the time-series signal to the enable terminal E. It becomes operational after receiving Sd,
As a result, command signals can be transmitted and received between the transmitting circuit 50 and the receiving circuit 61 only during the period when the time-division signal Sd is output. Further, between the transmitting circuit 60 and the receiving circuit 52, each AND circuit 55 in the transmitting circuit 60 allows the operation signal from the operation switch 31 to pass only during the period when the time-sharing signal Sd is received, and at the same time, the The latch circuit 56 receives the time-series signal 3d at the enable terminal E and becomes operational, and as a result, the operation signal is transmitted between the transmitter circuit 60 and the receiver circuit 52 only during the period when the time-division signal Sd is output. can be sent and received. and,
In this way, the first transmitting/receiving device 50 and the second transmitting/receiving device 59
The state in which transmission and reception are possible between each unit device 14a to 14h9 depends on the output cycle of the time-sharing signal Sd.
It is sequentially switched every 30h from a to 30h, and in short, the common bus 34 is exclusively used at different timings by corresponding ones of the eight unit devices 14a to 14h and the display and operation devices 30a to 30h. be.

According to this embodiment described above, the following effects can be expected.

(a) Since the size display operation device 30 paired with each unit device 14 is centrally arranged at an appropriate height position on the front surface rR, 27, its operation and confirmation of display contents can be performed at the height position of the corresponding unit device 14. This can be easily done without being restricted by the above, and the work of replacing the indicator light 31 is also facilitated.

(b) One front door 27 in the front opening 11a of the outer box 11
Therefore, if a drip-proof and dust-proof structure is required, just install a gasket 29 on this one front door 27 and change the ventilation panel 26 to a structure without the ventilation opening 26a. The unit device 14 can be made drip-proof and dust-proof, and therefore the structure is simpler and cheaper than in the past, which required these structures to be applied to each of a plurality of unit devices.

(c) Since the configuration is such that the connection lines necessary for supplying power and transmitting and receiving signals between the plurality of unit devices 14 and display operation devices 30 are shared by the common bus 34,
The number of required connection wires can be significantly reduced, and the overall structure can be simplified and assembly work efficiency can be improved accordingly. In addition, in this case, the number of connecting wires between the outer box 11 and the front surface 15!27 is also reduced, and the front surface 5? i2
There is no possibility that the opening/closing of 7 will be hindered.

(d) Common bus bar 34, unit bag @ 14 and display operation device 3
o and the first plugs 22, 35 and the second plug 33.
．． Since the connection is made through 36, the workability when putting in/out and replacing the unit device 14 and when replacing the display/operation device 39 is improved.

Moreover, in this case, this and the unit device 14 are connected to the common bus 34.
A first connector 35 provided to connect between this and the display operating device 30, and a second connector 33 provided to connect this and the display operating device 30 to the common bus bar 34 are connected to the corresponding unit devices. 14
Since it is provided close to the display device 30, there is a lead connecting between them. 22a, 33a can be made to a relatively short constant length, and these lead wires 22a, 33a
It is possible to promote the standardization of connecting parts including
Maintainability will improve.

In the above embodiment, a case where eight unit devices i14 and eight display operation devices 1i30 are provided is explained, but in this embodiment, it is also possible to output the time division signal Sd divided into 16 from the timing circuit 48.57. Since this is possible, up to 16 unit devices and display operation devices can be incorporated without making any changes to the electrical configuration. Therefore, for example, 8 unit devices and 8 units each can be installed on the back of the outer box 11. It can also be easily constructed as a double-sided control center equipped with a display and operating device. Of course, if the time division signal @Sd is further subdivided, a larger number of unit devices 1
4 and the display/operation device 30 can share the common PiJ line 34.

[Effects of the Invention] As is clear from the above description, according to the present invention, the visibility and operability of the display operation device can be improved, and the structure can be easily constructed when drip-proof and dust-proof structures are adopted. Moreover, it is possible to significantly reduce the number of connection wires connecting multiple unit devices and display/operation devices, simplifying the overall structure and improving manufacturability. Also, it has excellent effects such as simplifying the work of replacing the display and operation device.

[Brief explanation of drawings]

1 to 10 show an embodiment of the present invention,
Figure 1 is the overall front view with the front door open, Figure 2 is the overall front view with the front door open.
The figure is a front view of the entire unit with the front door closed, Figure 3 is a schematic perspective view of the unit device, Figure 4 is a diagram showing the overall schematic electrical configuration, and Figure 5 is a synchronization signal generation 6 is an electric circuit diagram showing the power supply circuit, FIG. 7 is an electric circuit diagram showing the timing circuit, FIG. 8 is an electric circuit diagram showing the transmitting circuit, and FIG. 9 is an electric circuit diagram showing the circuit and counter circuit. FIG. 10 is an electric circuit diagram showing the receiving circuit and a timing chart for explaining the operation. Moreover, FIG. 11 is a perspective view showing a conventional example. In the figure, 11 is an outer box, 11a is a front opening, 13 is a unit chamber, 14 is a unit device, 16 is a wiring breaker (main circuit device), 17 is an electromagnetic contactor (main circuit device), and 20 is a circuit board, 22.35 is the first plug, 27 is the front door, 28 is the hinge mechanism, 29 is the seal, 30 is the display operating device, 3
1 is an indicator light (display means), 32 is an operation switch (operation means), 33.36 is a second plug, 34 is a common bus bar, 38
41 is a counter circuit, 44 is a power supply circuit, 48.57 is a timing circuit, 50 is a first transmitting/receiving device, 51 is a transmitting circuit, 52 is a receiving circuit, 53 is a photocoupler, and 54 is an operational aid. 59 is a second transmitting/receiving circuit, 60 is a transmitting circuit, and 61 is a receiving circuit. Applicant Toshiba Corporation Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. An outer box that has a front opening and has unit chambers formed in multiple stages inside, and a plurality of unit devices that are housed in each of the unit chambers and have main circuit equipment, etc. for switching and protecting loads, organized into unit circuits. a front door pivotably mounted on the front opening of the outer box; and a front door centrally disposed on the front door to monitor and operate the status of each unit device. a plurality of display and operation devices each having a display means and an operation means for the operation, a plurality of common busbars installed near the pivot portion of the front door, and a plurality of common busbars connecting these and each of the unit devices to the common busbar; a first connector provided in the same manner as above, a second connector provided in the common bus line so as to connect this and each of the display operating devices, and a second connector provided in each of the unit devices and the display means. a first transmitting/receiving device that transmits a command signal for driving via the common bus and receives an operation signal from the operating means via the common bus; and the operating means provided in each of the display and operating devices. a second device that transmits an operation signal from the display unit via the common bus line and receives a command signal for driving the display unit via the common bus line;
a transmitting/receiving device; a synchronizing signal generation circuit that intermittently generates a synchronizing signal and supplies it to the common bus; a counter circuit applied to a common bus; and the synchronization circuit, which is initialized by the initialization signal provided in each of the unit devices and the display operation device and applied via the common bus, and is also applied via the common bus. A timing circuit that counts signals and generates a time-sharing signal at a unique timing for each paired unit device and display operation device, and the first and second transmitting/receiving devices are connected to the unit device and display to which they belong, respectively. A control center characterized in that it is configured to perform transmission and reception in synchronization with a time division signal from a timing circuit within an operating device.