JP2869832B2 - Plant control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant control device , and more particularly to a plant control device used for a control system of a water and sewage plant, a steel plant, a general industrial plant and the like.

[0002]

2. Description of the Related Art As a prior art of this type of plant control apparatus , as disclosed in Japanese Patent Application Laid-Open No. 2-130601 ("Equipment protection apparatus in control apparatus"), in a control system using a sequence controller, equipment protection is not considered. , Hardware was provided and mounted on the control panel. Further, as a general system configuration, an on-site operation panel, a motor and a machine driven by the motor and mechanical failure contacts are installed on the site, and a power panel and a control panel are installed in the electric room.

[0003]

However, in the prior art, one piece of equipment protection hardware is assigned to a plurality of pieces of equipment protection hardware, and the protection contents are standardized. Was. For this reason, if devices with greatly different protection contents coexist in the control system, there is a problem that the relay circuit must be designed each time, since failures in each device cannot be sufficiently handled. Was. In addition, the system configuration is a complex wiring that connects the on-site operation panel and power panel, the on-site operation panel and control panel, the mechanical failure contact and the control panel, and the control panel and the power panel with a direct delivery work cable. Because of the adoption of the law, laying of direct-carrying cables required a great deal of time and money.
Attempts have been made to address this, but all have failed due to restrictions on the mounting space of the external terminals (TB) in the control panel. For this reason, a plant control device capable of easily arranging a cable for direct delivery work and reducing the time required for designing and manufacturing a control panel has been desired.

[0004] The present invention has been made in view of such circumstances, thereby improving the construction workability and maintainability Plastic
It is intended to realize a client control device .

[0005]

The above object is achieved by the following means. The invention according to claim 1 includes a plurality of devices.
A plurality of motors to be driven, and the plurality of motors
With multiple power units that drive
A center, a field operation panel for operating the equipment on site, and a
A sequence controller that controls multiple devices
The sequence controller is provided corresponding to a plurality of devices.
Process input / output signals from the controller for controlling the equipment
A plurality of relay units input through the
And a control panel containing a process input / output device.
The ray unit is connected to the on-site operation panel via a cable.
The process input / output device is connected to each relay unit.
Between the power unit and the corresponding power unit.
A plant control device characterized by being connected by: Also <br/>, according to claim 2 invention, a plurality of driving a plurality of devices
Motors and a plurality of motors for driving the plurality of motors for each motor
Control center containing the power unit of
An on-site operation panel for operating devices on site, and
A detector for detecting a state of the device and controlling the plurality of devices
And the central equipment board in accommodating the sequence controller, said
The sequence controller provided for a plurality of devices.
Signal for controlling the device from the
A plurality of relay units input through the
A rice cake board containing an input / output device, and the relay
The unit connects cables to the on-site operation panel and the detector.
Through the relay unit and the process input for each relay unit.
Connect between the output device and the corresponding power unit.
Plant control characterized by being connected by a
apparatus. Further, according to claim 3, wherein invention to drive a plurality of devices
A plurality of motors, and the plurality of motors are driven for each motor.
Control center containing multiple power units
A field operation panel for operating the device on site, and the plurality of
A failure detector for detecting a failure of each of the plurality of devices;
A sequence controller for controlling a plurality of devices;
Provided from the sequence controller
Through the process input / output device
Relay unit and process input / output
A control panel housing the device, wherein the relay unit
Is connected to the on-site operation panel and the fault detector via a cable.
Process input and output for each relay unit
Connectors between equipment and corresponding power units
Plant control device characterized by being connected by
Place. Further, according to claim 4, wherein the invention drives a plurality of devices
A plurality of motors, and the plurality of motors are driven for each motor.
Control center containing multiple power units
A field operation panel for operating the device on site, and the plurality of
A failure detector for detecting a failure of each of the plurality of devices;
The central setting that houses the sequence controller that controls the
And the sequencer provided for the plurality of devices.
Signal from the controller to control the device.
Multiple relay units input via access input / output device
And a control panel containing the process input / output device.
The relay unit is connected to the on-site operation panel and the failure.
Each relay unit is connected to the detector via a cable.
Between the process input / output devices and the corresponding power
It is characterized by being connected to the knit by a connector
Plant control device.

[0006]

According to the plant control device having the above configuration , each relay
With to connect to the site control panel the Yunitsuto, process
Connect between the input / output devices and the corresponding power unit.
Since the connection is made using a connector, the wiring
Work can be simplified. Moreover, a plurality of relay units and
Process input / output devices can be stored in the same control panel,
Can be connected to the process input / output device via in-panel wiring.
Extra space for mounting external terminals (TB) on the board
I will. The control panel also has a mechanical protection circuit
A relay unit containing a German operation circuit can be mounted.
Therefore, machine protection is performed according to the protection content of each device.
You. Therefore, the operation panel and mechanical failure contact
Can be connected directly to the control panel with a construction cable.
Signals can be easily controlled by mechanical protection function and single operation device
Input to a relay unit that has
Then, the sequence controller is stored in the central equipment panel,
And multiple power units are stored in the control center
To a simple structure with excellent workability and maintainability.
You. For this reason, the number of cables for direct delivery work can be reduced, and
There is no need to spend a lot of time and money. Also, oh
Make a relay unit according to the type of
And the design and production time of the control panel can be shortened.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an external configuration of a control system applied to the plant control device of the present invention. In the figure, reference numeral 1 denotes a motor control center (power panel),
A plurality of power units 2 are mounted on the motor control center 1. The power unit 2 includes each device 4
And a plurality of motors provided for each device 4
It is mounted as a building block in the motor control center 1 corresponding to the pair. The power unit 2 supplies electric power to the motor 3 and drives the device 4. In the power unit 2, a wiring breaker 5, a magnet switch (abbreviated as MgSW) 6, a thermal relay 7, and a connector 8 are mounted. The connector 8 is connected to a connector 13 of a relay unit 12 via a cable duct 11 in a control panel 10 by a dedicated multi-core cable 9.

The above-mentioned relay unit 12 is indicated by an abbreviation of “VPU” in FIG. The main function of the relay unit 12 is a mechanical protection device function by a mechanical failure contact 14 as a failure detector for detecting a mechanical failure of the device 4, and an operation function by an instruction from a local operation panel 16. The mechanical contact 14 and the operation location changeover switches 17 and 18 in the on-site operation panel 16 are connected to an external terminal 21 (abbreviated TB) in the control panel 10 by a direct delivery cable 19 and a direct delivery cable 20, respectively. ing. An external terminal 21 in the control panel 10 is connected to a connector 15 in the relay unit 12 via a dedicated cable 22.

Further, in order to exchange a mechanical failure signal detected by the mechanical failure contact 14 and an automatic control signal output from each part of the control system between the relay unit 12 and the sequence controller 30, Dedicated cable 24 from relay unit 12 through connector 23
Is connected to the card 26 in the process input / output device 25. These signals are transmitted from the communication card 27 to the sequence controller 30 in the central equipment panel 29 via the transmission cable 28. The power unit 2 and the relay unit 12 are mounted on the motor control center (power panel) 1 and the control panel 10 in one-to-one correspondence with the plurality of motors 3 and devices 4. That is, similarly to the motor control center 1, the relay unit 12 is constructed in the control panel 10 like a building block.

FIG. 2 shows the appearance of the relay unit 12 shown in FIG. In the figure, a metal fitting 31 is formed by being bent into a U-shape so that a front surface is short and a rear surface is long, and constitutes a unit for mounting components. A DIN rail 32 for mounting a relay, connectors 13, 15, and 23, and a relay 33 are mounted on the metal fitting 31. As described above, the relay unit 12 is configured to have a simple structure and a low front surface and a high rear surface so as to facilitate maintenance and wiring work.

FIG. 3 shows details of the upper part of the control panel 10. The contents of the wiring are the same as those shown in FIG. By the way, since the process input / output device 25 mounted on the control panel 10 uses many weak electric components, it is necessary to consider noise. In addition, the number of wirings for the mounting card 26 is large, and it is necessary to consider wiring processing. For this purpose, the metal fittings 34 are mounted as shown in the figure, and the noise shielding member and the wiring processing shelf are also used. In addition, the relay unit 12 is configured to mount two units in the lateral direction of the control panel, and it is necessary to consider cable wiring processing. For this purpose, a metal fitting 35 is mounted on the front surface of the relay unit 12 as shown in the figure, so as to take up a wiring processing space.

Further, a total of 16 relay units 12 are mounted on the control panel 10, that is, 2 rows × 3 steps = 6 on the front side and 2 rows × 5 steps = 10 on the rear side. The number of 16 units is an optimum number and has an important meaning as the number of devices to be protected per one surface of the control panel 10. That is, 1
If the number is less than 6, the number of control panels increases remarkably compared with the conventional one, and the economic minus is large. Conversely, if the number exceeds 16, the number of cables to be processed on one control panel increases, and the production of control panels and cable cloth There is a problem that the line becomes difficult. The fact that the process input / output device 25 is mounted on the control panel 10 and connected to the sequence controller 30 by the transmission cable 28 also means that the control panel 1
This is important in that wiring processing within 0 is performed efficiently.

FIG. 4 shows the above-described contents in a wiring connection diagram. As is clear from FIG. 4, the power unit 2 and the relay unit 12 are connected to the connectors 8 and 13 by dedicated multi-core cables 9 respectively, while the mechanical contacts 14 and the on-site operation panel 16 are connected to the direct-feeding work cables, respectively. 19 and 20, the relay unit 1
2 is connected to the connector 15. In order to exchange a mechanical failure signal detected by the mechanical failure contact 14 and an automatic control signal output from each part of the control system between the relay unit 12 and the sequence controller, the relay unit 12 It is connected via a connector 23 to a card 26 in the process input / output device. Although only one mechanical fault contact 14 is shown in FIG. 4, the number of mechanical fault contacts 14 may increase depending on the device. In such a case, it can be easily dealt with by increasing the number of relays (33 in this figure) that receive the faulty contact. This can be easily understood from the fact that there is a margin in the number of relays mounted in the relay unit 12 as shown in FIG.

[0014]

According to the present invention, it is possible to easily carry out the direct wiring work in a short time and to shorten the design and production time of the control panel. In addition, it is possible to easily cope with the difference in the contents of protection by the machine and the coexistence thereof, and to configure a control system with high reliability and excellent maintainability.

[Brief description of the drawings]

FIG. 1 is an external configuration diagram showing an overall configuration of a control system applied to the present invention.

FIG. 2 is a perspective view showing a mounting structure of the relay unit in FIG.

FIG. 3 is a perspective view showing a mounting structure at an upper part in a control panel in FIG. 1;

FIG. 4 is a wiring diagram showing an electrical configuration of the control system in FIG. 1;

[Explanation of symbols]

 1 Motor Control Center 2 Power Unit 3 Motor 4 Equipment 5 Wiring Circuit Breaker 6 Magnet Switch 7 Thermal Relay 8 Connector 9 Dedicated Multi-Core Cable 10 Control Panel 11 Cable Duct 12 Relay Unit 13 Connector 14 Mechanical Failure Contact 15 Connector 16 Field Operation Panel 17 Operation location changeover switch 18 Switch 19 Direct delivery cable 20 Direct delivery cable 21 External terminal (TB) 22 Dedicated cable 23 Connector 24 Dedicated cable 25 Process input / output device 26 Card 27 Communication card 28 Transmission cable 29 Central equipment panel 30 Sequence controller 31 bracket 32 DIN rail 33 relay 34 bracket 35 bracket

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fujio Sato 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture Inside the Omika Plant, Hitachi, Ltd. (72) Inventor Hisashi Ito 5-2-2 Omikacho, Hitachi City, Ibaraki Prefecture No. 1 Inside the Omika Plant, Hitachi, Ltd. (56) References JP-A-2-130601 (JP, A) JP-A-60-128806 (JP, A) JP-A-63-283404 (JP, A) JP-A Sho 56-53506 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02B 1/30 G05B 19/048 H02B 1/04 H02B 3/00

Claims (4)

(57) [Claims] A plurality of motors for driving a plurality of devices;
A plurality of power units for driving the plurality of motors for each motor;
Control center containing the
And a system for controlling the plurality of devices.
Sequence controller and multiple devices.
The device from the sequence controller.
A control signal is input via the process input / output device.
Accommodates a number of relay units and the process input / output devices
A control panel, wherein the relay unit
Each relay unit is connected to the operation panel via a cable.
Between the process input / output devices and the corresponding power
It is characterized by being connected by a connector to the knit
Plant control device. 2. A plurality of motors for driving a plurality of devices;
A plurality of power units for driving the plurality of motors for each motor;
Control center containing the
Check the on-site operation panel operated by
Detector that emits and a sequence for controlling the plurality of devices
A central equipment panel containing a controller, and the plurality of devices
Provided from the sequence controller.
A signal for controlling the device is transmitted via a process input / output device.
A plurality of relay units for inputting and the process input / output device
And a control panel in which the relay unit is housed.
Is connected to the on-site operation panel and the detector via a cable.
The process input / output device is connected to each relay unit.
Between the power unit and the corresponding power unit.
A plant control device characterized by being connected by: 3. A plurality of motors for driving a plurality of devices;
A plurality of power units for driving the plurality of motors for each motor;
Control center containing the
On-site operation panel operated by the
And a sequencer for controlling the plurality of devices.
And a controller provided for the plurality of devices.
Control the device from the sequence controller.
Input signals via the process input / output device.
Control that accommodates the lay unit and the process input / output device
A relay panel, wherein the relay unit includes the on-site operation panel.
Connected to the fault detector via a cable.
-For each unit, between the above-mentioned process input / output device and correspondence
Connected by a connector to the power unit
A plant control device characterized by the above-mentioned. 4. A plurality of motors for driving a plurality of devices;
A plurality of power units for driving the plurality of motors for each motor;
Control center containing the
On-site operation panel operated by the
And a sequencer for controlling the plurality of devices.
A central equipment panel containing the
The sequence controller provided for the device
Signals for controlling the above devices via a process input / output device.
Multiple relay units and process input / output
And a control panel containing a force device.
Is connected to the on-site operation panel and the fault detector via a cable.
Connected to each other and the process
Connection between the power units and the corresponding power units
Plant control equipment connected by a
Place.