JP4726514B2 - Control center function unit - Google Patents

Description

  The present invention relates to a functional unit of a control center that performs start-up control and protection of a motor used in a power plant or the like, and more particularly to a functional unit incorporating an electronic relay or an electronic multi-controller (hereinafter referred to as an electronic relay). Is.

  FIG. 7 is a perspective view of the control center. Reference numeral 1 denotes a box of the control center, and 1a denotes a front door for a functional unit arranged in a plurality of stages in the vertical direction of the box. Reference numeral 2 denotes a functional unit housed in the front door 1a, which constitutes a control unit for performing opening / closing control and protection of a motor circuit (not shown). For example, as described in Patent Document 1, the conventional functional unit 2 assigns the wiring of the equipment in the unit such as the division breaker, the electromagnetic switch, and the relay to the external control line connection terminal block based on the control circuit configuration. Connected to form a control circuit.

  In addition, recently, there is an electronic relay 3 that can be changed easily by rewriting the ladder sequence, which is a simple program, using the electronic relay 3 instead of the relay. Of the output contacts, only necessary contacts are partially taken out through a connector and connected to an external electric device through a control line connection terminal block.

Japanese Patent Laid-Open No. 06-153329 (FIG. 1)

  Since the control center having a conventional electronic relay is configured as described above, when the control circuit configuration of the functional unit is changed, it is possible to cope with the software by changing the ladder sequence in the electronic relay. However, the wiring from the conventional electronic relay is connected to the control line connection terminal block while checking the circuit configuration according to the control circuit configuration. There is a problem that it is necessary to connect the added wiring, remove the unnecessary wiring, and add a terminal block.

  FIG. 8 shows a modified example of the control circuit configuration in the conventional electronic relay. For example, it is assumed that there is a change made by canceling the b-contact 19 and adding the c-contact 20 in the configuration including the a-contact 18 and the b-contact 19 configured on software inside the electronic relay. In this case, the contact circuit can be easily realized by changing the ladder sequence. However, with regard to the wiring to the control line connection terminal block, in the four-point terminal block 21 shown in FIG. One terminal block 21a was added to the original four-point terminal block 21 and the newly added contact wiring 23 had to be connected. Further, as shown in FIG. 10, even in the case of the terminal block 24 having a sufficient number of contacts, a newly added contact wiring 23 is necessary. 9 and 10, terminals E1 to E7 correspond to terminals at both ends of each input / output contact incorporated in the electronic relay as shown in FIG.

  If the performance of the electronic relay is low and the wiring of the input / output contacts is small, this method can be used sufficiently. However, due to the increase in functions that can be used due to higher performance of electronic relays and the accompanying increase in wiring, select the necessary control lines as described above, and connect to the control line connection terminal block while checking the circuit configuration. A lot of time was spent on the work. Also, even when the control circuit configuration changes, unnecessary wiring is removed and additional control lines increase, making it more difficult to work than new wiring, and workability is very poor. . Changes in the control circuit in the control center occur on a daily basis, and the conventional wiring system has poor work efficiency, and the possibility of miswiring has become extremely high by performing rewiring many times.

  The present invention has been made to solve such a problem, and it is possible to cope with various control circuit configurations by simply changing the ladder sequence in the electronic relay more than when the functional unit is assembled. It is an object of the present invention to realize a new functional unit configuration of a control center that does not require a wiring change in the functional unit and addition of hardware.

The present invention provides a control center having a functional unit that houses a main circuit device for opening / closing / protecting a load and an electronic relay for controlling the load, and is connected to an external device attached to the front surface of the functional unit. A control line connection terminal block to be provided, and on the back side of the control line connection terminal block, a wiring connection terminal for connecting wirings derived from all input / output contacts of the electronic relay is provided, and the control line connection terminal An external control line connection terminal having the same potential as the wiring connection terminal is provided on the surface side of the base, and all wirings derived from all input / output contacts of the electronic relay at the time of assembly are connected to the wiring connection terminal. with pre-connected, when changing the ladder sequence in the electronic relay control circuitry selectively connects only the external control line to an arbitrary terminal of said external control line connecting terminal It is obtained by the.

  In the functional unit of the control center according to the present invention, all the input / output contacts of the electronic relay are connected to designated locations on the control line connection terminal block from the time of assembling the functional unit, and the operator can control from the surface of the functional unit. By inserting / removing to / from the designated external control line connection terminal according to the change of the circuit configuration, it is possible to easily cope with various control circuit configurations only by changing the ladder sequence inside the electronic relay.

Embodiment 1 FIG.
FIG. 1 shows a front view of a functional unit of a control center according to Embodiment 1 of the present invention, FIG. 2 shows a bottom view thereof, and FIG. 3 shows a plan sectional view of a functional unit portion of the control center.
In the figure, 2 is a functional unit, 3 is an electronic relay, 4 is a connector that contacts the bus 17 via a connecting piece that is split into two and receives three-phase power supply, and 4a has one end connected to the connector 4 The main circuit wiring for connecting the other end to the input terminal 5a of the section breaker 5, and 6 indicates a base for mounting the device.

  The section breaker 5 described above is attached to the base 6, and the direction of the input terminal 5a and the output terminal 5b is the left-right direction, and each of the three phases is horizontally arranged with an interval in the up-down direction. Reference numeral 7 denotes an electromagnetic switch attached to the base 5, wherein the input terminal 7 a and the output terminal 7 b are oriented in the left-right direction, and the three phases are arranged horizontally with an interval in the up-down direction. 4b is a main circuit wiring for connecting the output terminal 5b of the section breaker 5 and the input terminal 7a of the electromagnetic switch 7, and 8 is on the base 6 between the breaker 5 and the electromagnetic switch 7. A current sensor (current transformer) that is positioned so as to pass through the main circuit wiring 4b, and a signal detected thereby is input to an electronic relay 3 that protects and controls the circuit. ing.

Reference numeral 9 denotes a control line connection terminal block which is located on the lower part of the front surface of the functional unit 2 and is fixed to the terminal block mounting plate 10 projecting from the side wall 2a of the functional unit 2 with a screw or the like. Reference numeral 11 denotes a cable connected to a load (not shown). The tip of the electromagnetic switch 7 is bent at a substantially right angle from the output terminal 7b of the electromagnetic switch 7 along the side of the functional unit 2 and descends below the control center. Has been derived.
Reference numeral 12 denotes an operation handle for operating the section breaker to be turned on and off from the front of the outside. The handle 12 and a part of the electronic relay 3 protrude from the front door 1a. (See FIG. 3).

  Next, the control wiring of the electronic relay 3 that can cope with various control circuit configurations only by changing the ladder sequence will be described. All input / output contacts of the electronic relay 3 are led out via the connector 13, and all of the lead-out wiring 14 is connected to the electronic relay side wiring on the back surface of the control line connection terminal block 9 attached below the front surface of the functional unit 2. The external control line 15 is connected by being inserted into the external control line connection terminal 9 a on the surface of the control line connection terminal block 9.

  FIG. 5 is a perspective view of the control line connection terminal block 9 and FIG. 6 is a side sectional view thereof. As described above, the wiring 14 led out from all the input / output contacts of the electronic relay 3 is provided on the back surface. The control line connection terminal block 9 is plugged into the back terminal 9b. On the other hand, a plurality of external control line connection terminals 9a having the same potential as the terminal 9b are arranged on the surface (in the figure, two stages up and down), and necessary external control lines 15 are inserted and connected. . Note that an insulating cover 16 for safety and reinforcement is applied to the insertion portion of the external control line 15.

  In the functional unit 2 of the control center configured as described above, when the control circuit configuration change shown in the figure is taken as an example, all the input / output contacts E1 to E8 of the electronic relay 3 are connected to the control line as shown in FIG. Since it is connected to the connection terminal block 9, it can be easily dealt with by changing the connection of only the external control line 15, and other hardware changes such as changing the wiring and adding a terminal block become unnecessary. For this reason, it is possible to cope with sudden changes in a short time, and furthermore, even if the existing control center is modified, the construction period can be shortened or changed by the user, so that there is an effect of cost reduction.

  Furthermore, since all the wiring in the functional unit 2 is connected to the back surface of the control line connection terminal block 9 when the functional unit 2 is assembled, complicated wiring does not appear on the front surface, and the user can connect the external control line 15 to the front surface terminal 9a. Easy to connect. Also, by connecting all the input / output contacts of the electronic relay 3 to the designated terminals of the control line connection terminal block 9, the same wiring work is performed regardless of the configuration of the control circuit. There is an effect of connection suppression. In addition, since a pre-wired control line connection terminal block can be created, the functional unit manufacturing process can be shortened. Furthermore, since the assignment of the wiring of the control line connection terminal block 9 is constant, it is difficult to be confused at the connection place of the external control line connection terminal 9a even when the control circuit configuration is changed.

It is a front view which shows the functional unit of the control center in Embodiment 1 of this invention. It is a bottom view which shows the functional unit of the control center in Embodiment 1 of this invention. The plane sectional view seen from the upper part of the functional unit of the control center in Embodiment 1 of this invention is shown. It is a wiring and a terminal block block diagram at the time of the control circuit structure change of this invention. It is a perspective view which shows the whole control-line connection terminal block of this invention. Similarly, the sectional side view of the control line connection terminal block is shown. The whole block diagram of a control center is shown. It is the schematic which shows an example of a control circuit structure change. It is the wiring at the time of the conventional control circuit structure change, and a terminal block block diagram. It is the wiring at the time of the other conventional control circuit structure change, and a terminal block block diagram.

Explanation of symbols

1: Control center box
2: Functional unit,
3: Electronic relay,
4: Contact,
4a, 4b: main circuit wiring,
5: Sectional circuit breaker,
6: Mounting base,
7: Electromagnetic switch,
8: Current sensor,
9: Control line connection terminal block,
10: Terminal block mounting plate,
11: Cable,
12: Handle for circuit breaker operation,
13: Connector
14: Derived wiring from electronic relay,
15: External control line,
16: Insulation cover.

Claims (2)

In a control center having a functional unit that houses a main circuit device for opening / closing / protecting a load and an electronic relay for controlling the load, a control line connection that is attached to the front surface of the functional unit and connects to an external device A terminal block is provided, and on the back side of the control line connection terminal block, wiring connection terminals for connecting wirings derived from all input / output contacts of the electronic relay are provided, and the front side of the control line connection terminal block Is provided with an external control line connection terminal having the same potential as that of the wiring connection terminal, and all wirings derived from all input / output contacts of the electronic relay at the time of assembly are connected in advance to the wiring connection terminal. it when changing the ladder sequence in the electronic relay control circuitry which is adapted to selectively connect only the external control line to an arbitrary terminal of said external control line connecting terminal Control center functional unit, characterized. Connection between the lead-out wiring from all the input / output contacts of the electronic relay and the wiring connection terminal of the control line connection terminal block, and the external control line and the external control line connection terminal of the control line connection terminal block The control center functional unit according to claim 1, wherein the connection is a plug-in connection .

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