JP2010097548A - Relay panel for control plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relay panel for a water treatment control plant that cost-effectively facilitates internal and external wiring and controls an interlocked operation of two or more types of different control patterns. <P>SOLUTION: The relay panel 100 is provided with a plurality of multifunction relays 200 each unitizing in a housing 220 a program storage part 201 for storing a plurality of control pattern programs; a rotary switch 215 for selecting a desired program; an arithmetic part 202 for executing the program; and terminal blocks 211-213 for internal and external wiring connection. The terminal blocks 211 and 213 for external wiring connection are arranged on one side of the housing 220 of the multifunction relay 200, and the terminal blocks 212 for internal wiring connection are arranged on the opposite side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a relay panel installed in a water treatment control plant such as a water purification facility or a sewage treatment facility, and particularly relates to a relay panel capable of saving wiring.

  Conventionally, as a control panel for controlling a plurality of loads, for example, in a control panel equipped with a control circuit for controlling various driving means in a machine tool, the control panel is configured with a control circuit corresponding to a required operation form of the machine tool. A technique provided with means for selecting a sequence circuit is disclosed (for example, Patent Document 1).

JP 2003-263204 A

In the relay panel of water treatment control plant equipment, a large number of control patterns are required, and not only between the control panels but also the wiring in the panel and its connection terminals are complicated and enlarged, increasing the size and cost of the panel. There is no high factor. In addition, expansion of existing equipment and remodeling work are actively carried out. However, the construction of new wiring inside and outside the board is complicated, and it takes a long construction period. Losses due to shutdown and increased construction costs are becoming problems.
In addition, in order to perform more sophisticated system operation of a plant, there is an increasing demand for performing load operation in conjunction with each other by selecting two or more types of control having different control patterns.

In order to apply the technique disclosed in Patent Document 1 to such a requirement, there are the following problems.
That is, when the control pattern increases, a large number of connection portions 22a to 22d shown in FIG. 2 of Patent Document 1 are required, and the number of relay circuit portions including the relay 16 and the relay terminal blocks 17a to 17d and 18 are increased. Increasing and the wiring circuit becomes complicated. As the number of external interfaces further increases, a large number of external terminal blocks 29 are required, and as a result, the operation mode selection box and the control panel for storing it are enlarged. In addition, since the selection of the sequence circuit is performed via the connector, it is time consuming, and furthermore, it is not possible to respond to requests for selecting operation control of two or more loads having different control patterns and interlocking with each other. There is a point.

  The present invention has been made in order to solve the above-described problems, and facilitates wiring work, facilitates selection of a control pattern program, and enables relay operation of a control plant capable of linked operation. The purpose is to provide a board.

  A relay panel of a control plant according to the present invention is provided with a plurality of multi-function relays. The multi-function relay has a program storage unit for storing a plurality of control pattern programs for load control, and a desired one from the program storage unit. A switch for selecting a control pattern program for the control panel, an arithmetic processing unit for executing the control pattern program selected by the switch, and a terminal board for connecting the outside panel of the relay panel and a terminal board for connecting the inside panel of the relay panel These are unitized and provided separately.

  Since it is a relay panel of a control plant having the above-described configuration, it is not necessary to provide a separate external terminal block, the device mounting efficiency is improved, and the control panel is downsized. In addition, since the wiring routes for the outside and inside of the panel are divided, the wiring work is facilitated, the workability at the time of remodeling and repair work of the panel is improved, and the cost is reduced.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of various boards required for a water treatment plant, for example. In the figure, the relay panel 100 installed in the electrical room includes a load single control circuit for starting and stopping the electric motor 106, for example, a load on site. The control center 103 is a board having a breaker, a magnetic contactor, etc., and a power circuit for turning on and off the power supply. The controller board 101 is a board that performs automatic control and a signal interface with a host system (not shown). The field operation panel 104 outputs and displays a load operation / stop command when the field operator turns on and off the operation switch to operate the load single control circuit constructed by the relay panel 100. It is a board. The instrument panel 102 is used for conversion to a measurement signal necessary for plant control and for displaying measurement values on the panel surface with the measurement device 105.

  FIG. 2 shows a schematic diagram of a control circuit of multifunctional relay 200 provided in relay panel 100 of the first embodiment. As will be described later, the multi-function relay 200 is unitized.

FIG. 3 shows a block diagram of the multi-function relay 200 in the relay panel 100.
As shown in FIG. 3, the multi-function relay 200 includes a program storage unit 201 that stores a plurality of control pattern programs, and a program switching rotary switch 215 provided in an interface unit 210 that selects a desired program from the program storage unit 201. , An arithmetic processing unit 202 that executes the program selected by the rotary switch 215, an outboard line connection terminal block 211, an inboard line connection terminal block 212 of the relay panel 100 provided in the interface unit 210, and a control center dedicated panel outside line It is composed of a connection connector 213 and a communication line connection terminal block 214 for exchanging signals with other multifunctional relays 200a.

FIG. 4 shows an external view of the multifunctional relay 200 that is unitized.
FIG. 4A is a front view, and FIG. 4B is a side view. On the front right side of the housing 220 of the unitized multi-function relay 200, an internal line connection terminal block 212 is provided on the left side of the front surface of the housing 220. On the left side of the housing 220, an external line connection terminal block 211 is provided. A panel connection connector 213 for connecting the control centers to each other, and a communication line connection terminal block 214 for transmitting / receiving signals to / from the other multi-function relay 200a via the unit upper central housing 220 are provided. In addition, rotary switch 215, RUN / STOP selector switch 216 of multi-function relay 200, maintenance connector 217 for changing internal control circuit and installing programs, input / output display, power-on display, error display, communication display lamp 218 is provided in front of the unit. An extension unit mounting connector 219 is provided at the lower part of the unit. The multi-function relay 200 is provided in the relay panel 100 as a spare alongside the regular one.

  FIG. 5 shows a front view of the multi-function relay expansion unit 250. This extension unit 250 uses up the multifunction relay 200 by connecting the male connector 251 shown in FIG. 5 to the extension unit mounting female connector 219 of the basic multifunction relay 200 shown in FIG. Even if this happens, the number of input / output signal points can be increased. Both the basic multifunction relay 200 and the extension unit 250 can be attached to the relay panel 100 by DIN rail attachment or screw attachment.

The multifunctional relay 200 unitized as described above has the following characteristics. That is, the outside line connection terminal block 211 is on the left side of the casing 220 on one side when viewed from the front of the multi-function relay 200, and the inside line connection terminal block 212 is on the right side of the casing 220 on the other side. These are provided together, and this allows the wiring routes of the outside line and inside line to be separated, and after the production of the relay panel 100 in the factory is completed, the workability and maintainability when connecting the outside line at the site are also improved. . In addition, the wiring space of the relay panel can be reduced, the relay panel can be reduced in size and weight, and the package transportability is improved.
Furthermore, since the wiring route is simplified, the yield of the wires can be improved and omitted without using extra wires. Further, the addition of a control circuit at the time of adding a load can be dealt with by adding a multi-function relay in which the control circuit is unitized, so that the existing relay panel 100 can be modified in a short time. Also, when the number of input / output points varies depending on the control pattern and the number of input / output points of the basic multifunction relay is insufficient, it can be easily handled by installing an extension unit. The positions of the external line connection terminal block 211 and the internal line connection terminal block 212 may be provided at positions where the wiring route can be separated, and may not be left and right.

Next, the operation will be described.
The arithmetic processing unit 202 of the multi-function relay 200 executes a desired control pattern program selected by the rotary switch 215 from a plurality of control pattern programs stored in the program storage unit 201. This control pattern program is stored with various conditions added by external input. The relay panel 100 performs input / output in accordance with the selected control program to the on-site operation panel 104, the control center 103, and the controller panel 101. Specific examples are shown below.
The multi-function relay 200 in the relay panel 100 receives a command from the operator's operation switch on the local operation panel 104, and confirms that an operation disable condition such as a failure of the load 106 has not occurred. The operation disabling condition at this time is determined from information obtained through the input / output interface unit 210. After confirming that the situation is not incapable of operation, the multi-function relay 200 outputs a command for operating a magnet contactor (a switch for turning on / off the power supply) in the control center 103. As a result, the power source is turned on and off to the load (electric motor) 106 connected to the control center 103. The on / off state of the load (electric motor) 106 (determined by the operation status of the magnet contactor) is output from the multi-function relay 200 in the relay panel 100 to the local operation panel 104 and the controller panel 101. As a result, the operator can visually confirm the operating state of the load (electric motor) 106.

  A personal computer or the like installed in the central management room is connected to the upper level of the controller panel 101. The multi-function relay 200 outputs the operation status of the load (motor) 106 to the controller panel 101 described above, whereby the operation status of the load (motor) 106 can be confirmed from a personal computer. It is also possible to output a command from the personal computer to the load (electric motor) 106.

  As described above, the multi-function relay 200 according to the first embodiment stores a plurality of control pattern programs, and a desired control pattern program can be selected by manual selection of the rotary switch 215. Unlike the control pattern selection method by connection change, the control pattern can be easily selected. The selection of the desired control pattern program is described in the program so as to recognize the control pattern program after confirming that the power supply state has been changed from OFF to ON. Even if the rotary switch 215 is changed by a manual operation, the previous control is continued, so that an equipment accident due to an erroneous operation can be prevented. That is, the selection of the control pattern program is performed by the operator's intentional operation because the operator needs to turn off the power of the multi-function relay 200 and turn it on again.

  Also, one unitized multifunction relay 200 is provided for one load, and when performing maintenance of a unit, by turning off only the power supply of the corresponding unit, There is no impact. That is, the relay panel 100 provided with the multi-function relay 200 according to the first embodiment can be maintained with minimal influence on the control plant.

Next, the operation when the load is a pump and a discharge valve will be described with respect to the mutual control between the multi-function relays 200.
FIG. 6A shows a state in which the water in the storage tank 300 is fed by the pump 106a and the discharge valve 106b, which are loads. FIG. 6B is a flow chart showing the interlock control of the pump ON and the discharge valve opening, and FIG. 6C is the flowchart showing the interlock control of the pump OFF and the discharge valve closing. The multi-function relays 200 and 200a shown in FIG. 3A are connected via a communication line connection terminal block 214. The control pattern program in the program storage unit 201 performs a linked operation between the multifunction relays 200 and 200a (between different loads) by exchanging signals between the load operation states through communication between the multifunction relays 200 and 200a. It is described as possible. 6B and 6C, the control pattern program of the multi-function relay 200 is set to the pump, and the multi-function relay 200a is set to the discharge valve. As described above, in both control pattern programs, a program for determining its own control according to the operation status of the other party is described, and the program operates according to this.
The command for the interlocking operation is performed by an operator command from the on-site operation panel 104 or a command from a personal computer from the upper central management room.

Abnormal processing at the time of interlock control is also incorporated in the control pattern program. For example, when the pump 106a is operated, the discharge valve 106b is not opened and the operation is closed, and the pipe may be ruptured. 6 (b) and 6 (c), the safety circuit is activated after a certain time counted by the timer mounted in the relay panel 100, and the pump 106a is automatically stopped. In this way, it has a function of operating the fail-safe circuit even during the interlock control between the multi-function relays.
In addition, it is possible to construct an advanced interlocking circuit by connecting multiple multifunctional relays with communication cables, so that the interlocking circuit that was previously constructed with a separate PLC etc. can be constructed using only the multifunctional relay. It can be constructed and the number of devices can be reduced.

  The present invention can be used for a relay panel provided in a water treatment control plant such as a water purification facility or a sewage treatment facility.

It is a block diagram which shows the various panels of the water treatment plant by Embodiment 1. FIG. 3 is a schematic diagram of a control circuit of the multifunction relay according to the first embodiment. 1 is a block diagram of a multifunction relay according to Embodiment 1. FIG. FIG. 2 is an external view showing a unitized multifunction relay according to the first embodiment. FIG. 3 is a front view showing the multifunction relay expansion unit according to the first embodiment. FIG. 6 is a flowchart for explaining the interlocking operation according to the first embodiment.

Explanation of symbols

100 relay panel, 106 load, 200 multifunction relay,
201 program storage unit, 202 arithmetic processing unit, 210 interface unit,
211 Terminal block for external line connection, 212 Terminal block for internal line connection,
214 Terminal block for communication connection, 215 Rotary switch,
219 extension unit mounting connector, 220 housing,
250 Multifunctional relay expansion unit.

Claims (5)

In the relay panel of the control plant, a plurality of multifunction relays are installed in the relay panel, and the multifunction storage includes a program storage unit for storing a plurality of control pattern programs for load control, and the program storage. A switch for selecting a desired control pattern program from the control unit, an arithmetic processing unit for executing the control pattern program selected by the switch, an external line connection terminal block for the relay panel, and an internal line connection for the relay panel A relay panel for a control plant, characterized in that the terminal block is unitized in the casing and provided separately. The multi-function relay is provided with a communication line connection terminal block for exchanging signals between the plurality of multi-function relays, and the program storage unit has a load connected to another multi-function relay. 2. An interlocking operation control pattern program that enables interlocking operation control of a load connected to itself and other multi-function relays by storing an operation status through the communication line is stored. Relay panel of the control plant described in 1. An abnormality processing program is stored in the program storage unit, the arithmetic unit is provided in the relay panel, and a timer time-over signal that detects an operation start time of a load that starts an interlock operation by the interlock operation control pattern program The control panel relay panel according to claim 2, wherein the interlock operation is controlled to stop by the abnormality processing program. 2. The control plant according to claim 1, wherein the multifunction relay is provided in one-to-one correspondence with a load, and a spare multifunction relay is installed on the relay panel. Relay panel. The multi-function relay is provided with an extension unit mounting connector, and the number of input / output signal points of the multi-function relay can be increased by mounting the multi-function relay extension unit. Item 8. A control panel relay board according to Item 1.

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