JPH02159602A - Control system for electrical equipment - Google Patents

Abstract

PURPOSE:To shorten the time required for the actual control of the operation after the time point of its operation and to simplify the control constitution by constituting the equipment so that it can be controlled by an operation by a job site console panel. CONSTITUTION:A unit device 2 is provided with a control part 18 for reading the set contents of priority setting switches 34, 35 and the operation contents of job site console panels 4a, 4b and executing a control to this unit device 2 and the job site console panels 4a, 4b, and also, a central console panel. The priority of an operation and the operation contents of each job site console panels 4a, 4b can be read by the control part 18 provided on the unit device 2, and by this control part 18, this unit device 2 and the job site console panels 4a, 4b, and also, the central console panel can be controlled, therefore, as for a signal transmission path for controlling actually an operation, it will suffice between the job site console panels 4a, 4b and the control part 18 of the unit device 2, and comparing with the case of executing them by the central console panel, both a hardware and a software are simplified.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides unit equipment and central operation that centrally arrange electrical equipment in a plurality of on-site operation panels and a control center arranged in the vicinity thereof. The present invention relates to a control system for electrical equipment that operates, monitors and controls between panels, and in particular prioritizes and controls operations on field operation panels.

(Prior Art) Generally, when controlling a plurality of distributed electrical devices, such as three-phase induction motors, the plurality of three-phase induction motors must be centrally operated, supervised, and protected. A control center equipped with a plurality of 111-position devices is installed to correspond to a plurality of three-phase induction motors, and an on-site operation panel is arranged near each three-phase induction motor.

Furthermore, a central control panel is installed to centrally control the operation status and failure monitoring of these unit devices and field control panels, and transmission cables are used between the unit devices and their corresponding field control panels and the central control panel. connected by.

8 Depending on the type of load, three-phase induction motors can be controlled exclusively by operating a central control panel, exclusively by operating a field control panel, or even exclusively by operating a unit device. There are cases where When a three-phase induction motor is operated exclusively by an on-site operation panel, one three-phase induction motor may be controlled by a plurality of on-site operation panels. In this case, the on-site operation panel is one that is located very close to the three-phase induction motor and is used for commissioning or testing the three-phase induction motor, and one that is used to start or stop the actual operation of the three-phase induction motor along with other three-phase induction motors. The purpose and contents of the operation may differ depending on the on-site operation panel for +Ix, etc.

In this way, when multiple on-site operation panels are provided for a three-phase induction motor, one of the multiple on-site operation panels belonging to one three-phase induction motor may be operated depending on the control purpose, etc. It is also possible to preferentially enable the operation of some panels and disable the operations of others, as necessary.

That is, each field operation panel is provided with an address switch for setting the priority of operations, and the priority of the address switch prioritizes the operation signal of the corresponding field operation panel, and the priority is set later. The operation signals from the on-site operation panel that have been activated are disabled. Signal transmission control in this case is as follows.

When the programmable controller of the central operation panel receives an operation signal from each field operation panel, it enables the signal from the field operation panel whose priority is set first, and disables the signals from the other field operation panels. Then, the content (operation content) of the validated signal is read, and the operation control signal is transmitted to the unit station of the unit device via the master station, as well as each field operation panel operation display signal and the like are transmitted.

(Problems to be Solved by the Invention) However, the above-mentioned conventional system has a problem in that it takes time from the time when the field operation panel is operated until the operation is actually controlled. That is, when the local operation panel is operated, the operation signal is given to the master station of the central operation panel via the unit station of the unit device,
The programmable controller then reads the priorities and operation details. Thereafter, a control signal is given from the master station to the unit station according to the operation content, and this unit station controls the unit device according to the control signal. Since the signal transmission path is thus long, it takes time from the point of operation on the field operation panel until the operation is actually controlled. In addition, the central operation panel performs various types of control for a large number of unit devices in addition to reading the priorities and operation details, so it requires quite complex control programs and data, and requires a programmable controller and master controller. There has been a problem in that the capacity of the station hardware and software has increased, resulting in high costs.

The present invention has been made in view of the above circumstances, and its l
The objective is to provide a control system for electrical equipment that can shorten the time from the time when an on-site operation panel is operated until the operation is actually controlled, and can also reduce costs.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a control center equipped with a plurality of unit devices for controlling, monitoring and protecting the operation of electrical equipment, and a control center equipped with a plurality of unit devices arranged near the electrical equipment. It is equipped with an on-site operation panel and a central control panel that collectively controls the control status of the plurality of unit devices and the operation status of the on-site operation panel, and a priority setting switch is provided for each of the plurality of on-site operation panels. In a control system for electrical equipment that prioritizes on-site operations, the unit device reads the setting contents of the priority setting switch and the operation contents of the on-site operation panel, and controls the unit device, the on-site operation panel, and the on-site operation panel. This device is characterized by being provided with a control section that controls the central operation panel.

(Function) The priority order and operation contents of each field operation panel are read by the control section provided in the unit device, and this control section controls this unit device, the field operation panel, and the central operation panel. The signal transmission path for actually controlling the operation from the point of operation is only between the on-site operation panel and the control section of the unit device. In addition, since the control unit reads the priorities, reads the operation details, and controls the operation of the field operation panel corresponding to one unit device, it requires both hardware and software compared to the case where these operations are performed using a central operation panel. It becomes easy.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

First, in Figure 3 showing the configuration of the entire control system,
Reference numeral 1 denotes a control center, in which unit devices 2 are arranged in multiple stages. Reference numeral 3 denotes a three-phase induction motor, which is an electrical device to be controlled, and a large number of these are installed in a dispersed manner. A plurality of field operation panels 4 are arranged near the three-phase induction motor 3. 5 is a central operation panel, which includes a programmable controller 6 and a master station 7.
It is constructed by H. Each unit device 2 and each field operation panel 4 of the control center 1 are connected by a transmission cable 8. Further, 9 is a unit station of the unit device 2, and 10 is a local station of the field operation panel 4. In this embodiment, two field operation panels 4a and 4b belong to one unit device 2, and the transmission communication system in this case is shown in FIG.

Next, one of the 111-position devices 2 of the control center 1, the three-phase induction motor 3 belonging thereto, and the field operation [4]
a and 4b will be explained in detail with reference to FIG.

11 is a main circuit consisting of three-phase main circuit busbars 12a, 12b, and 12C, which includes molded circuit breakers 13. Electromagnetic contactor 14. A load current detection current transformer 15 and a zero-phase current transformer 16 are interposed. Such a main circuit 11 is connected to the three-phase induction motor 3 via a main circuit cable 17. Reference numeral 18 denotes a control section equipped with a one-chip microcomputer that performs signal arithmetic processing, and the current transformer 15 and zero-phase current transformer 16 are connected to the input terminals of this control section, respectively. 19 is a control power transformer. 20 is an excitation coil of the electromagnetic contactor 14, 21 is an operation indicator lamp, 22 is a stop indicator lamp, 23 is an accident indicator lamp, 24 is an operation switch, and 25 is a stop switch, each of which is connected to a control unit. 18. Further, the unit station 9 is attached to the control section 18. This unit station 9 includes a transmission transmission port/path 26a, a transmission reception circuit 26b, and a transmission connector 26C.
When an electrical control signal is given from the control section 18, it converts it into a transmission signal and sends it to the transmission circuit 2.
6a, the transmission signal is sent to the transmission connector 26c, and when a transmission signal is given via the transmission connector 28C2 reception circuit 26b, this is received as an electric ff++J control signal and given to the control section 18. Furthermore, the unit station 9 is provided with an address switch 27.
This address switch 27 is used to set the number of field operation panels 4 belonging to one unit device 2. As shown in FIG. 4, this address switch 27 has three switch elements whose numerical values are indicated by a 3-bit binary code, and has a configuration of 1.14.

Now, the local station 10 provided on the field operation panels 4a and 4b includes a transmission circuit 28a.

It includes a transmission receiver 1j circuit 28b, a transmission connector 28c, and a control contact 29a for the operation indicator lamp 29.
, a control contact 30a for the stop indicator lamp 30, a control contact 31a for the accident indicator lamp 31, a signal generating circuit 32a for the operation switch 32, and a signal generating circuit 33a for the stop switch 33.

In this local station 10, when a transmission signal is given from the transmission connector 28G, it is converted into an electrical signal and sent to each control contact 29H via the transmission/reception circuit 28b.
to 31a.

Furthermore, when a control signal to start or stop is generated in the signal generation circuits 32a and 33a, the transmission transmission circuit 28a converts the electrical control signal into a transmission signal and outputs it to the transmission cable 8 via the transmission connector 28. Functional parts on the operation panel 4b that are the same as those on the field operation panel 4a are designated by the same reference numerals, and explanations thereof will be omitted.

These local stations 10 each have address switches 34=, 35 for setting operation priorities.
are provided for each. This address switch 34
．． 35 is configured similarly to the address switch 27 described above.

Therefore, in addition to controlling the unit device 2 in general, the control section 18 in the unit device 2 also reads the priority order and the operation contents of the field operation panels 4a and 4b, and performs control according to the operation contents. The unit device 2, the field operation panels 4a and 4b, and the central operation panel 5 are controlled.

The above configuration is applied to other unit devices 2 of the control center 1, their three-phase induction motor 3, and the field operation panel 4 in exactly the same way, and thus the control system is configured. It is something that

Next, the operation of this embodiment will be explained.

First, when the two-wire circuit breaker 13 of the capping device is turned on at about tlt, the power supply voltage between the main circuit buses 12a and 12c is supplied to the unit device 2 via the transformer 19 as the control 31+power supply.

In this state, if the address switches 27, 34 and 35 are not set, the unit device 2 of the control center 1 is controlled by direct operation of the unit device 2. Direct operation in this unit device 2 will be described below.

When the operation switch 24 of the corresponding unit device 2 is turned on to operate the three-phase induction motor 3, the control unit 18 outputs an operation control signal corresponding to the start of operation,
Based on this, the excitation coil 20 is energized and the electromagnetic contactor 14 is turned on.

Therefore, the three-phase induction motor 3 is operated with the power supply voltage of the main circuit 11 being supplied to the main circuit 11 via the main circuit cable 17. The control section 18 simultaneously energizes the operation indicator lamp 21 in the unit device 2 to turn it on, and sends an operation indicator signal to the unit station 9. The unit station 9 converts the operation display signal into a transmission number 18, and then sends it to the local station 10 of the corresponding field operation panel 4a via the transmission cable 8. The local station 10 converts this transmission signal into an electrical signal, turns on the control contact 29a based on the electrical signal, lights up the two operation indicator lamps, and thereby indicates the operation of the three-phase induction motor 3. Further, the unit station 9 sends a transmission signal indicating the operating state to the master station 7 of the central operation panel 5 via the transmission cable 8, and the master station 7 converts this transmission signal into a control signal and sends it to the programmable controller 6. Based on this control signal, the central operation panel 5 displays the operation of the three-phase induction motor 3.

Next, in the unit device 2, when the stop switch 25 is turned on to stop the three-phase induction motor 3, the control section 18 outputs an operation control signal corresponding to stopping the operation, and based on this, the excitation coil 20 is turned off. and turns off the electromagnetic contactor 14. Therefore, the three-phase induction motor 3 is stopped t1-.

At shift 3, the control section 18 turns off the operation indicator lamp 21, turns on the stop indicator lamp 22, and sends a stop signal to the unit station 9. The unit station 9 provides the corresponding transmission number ii to the local station 10 via the transmission cable 8.

This causes the local station 1o to control the control contact 30a.
is turned on to light up the stop indicator lamp 30. Furthermore, the unit station 9 also sends a transmission signal indicating this stopped state to the central operation panel 5 as described above.

Also, during operation of the three-phase induction motor 3, the control unit 18
The load current flowing through the main circuit 11 is detected by the current transformer 15, and a signal indicating this current value is sent to the transmission signal circuit 26a and the transmission connector 2 at the unit station 9.
6c to the local station 10, and the local station 10 causes the ammeter 36 to display the current value. Furthermore, the control unit 18 detects the zero-sequence current of the main circuit 11 by the zero-sequence current transformer 16 along with the load current,
It supervises the main circuit 11. When the control unit 18 detects an abnormality such as an overload current, an open phase, or a ground fault in the main circuit 11, it sends a trip signal to a tripping device (not shown) to trip the molded circuit breaker 13, and also displays an accident display. The lamp 23 is energized once to turn it on. Furthermore, when this abnormality is detected, an accident display signal is sent to the local station 10 via the transmission circuit 26a and the transmission connector 26c in the unit station 9, thereby turning on the control contact 31a and lighting the accident display lamp 31.

On the other hand, an accident display signal is also sent to the central operation panel 5.

Now, instead of directly operating the unit device 2, the on-site operation panel 4a,
A case will be described in which the unit device 2 is controlled by the remote operation of the unit 4b. In this case, the address switch 27 of the unit station 9 is set to the number of remote control units "2", and the on-site operation panel fff4a of both the on-site operation panels 4a and 4b is set to "2".
The address switch 34 of the field operation ff14b is set to priority "1", and the address switch 35 of the field operation ff14b is set to priority "2".

In such a remote control setting state, the control unit 18 enables or validates the operation of the on-site operation panel 4a, and disables the operation of the on-site operation panel 4b. In other words, on-site operation! If 4a or 4b is operated, local station 10
When an operation signal is given to the unit station 9 of the unit device 2, the control section 18 reads the priority order of the signal and makes the operation signal from the field operation panel 4a valid and the operation signal from the field operation panel 4b invalid. become Then, the content of the activated operation signal (operation content) is read and control is performed according to the content of the operation. For example, on-site operation panel 4
If the content of the operation a is an ON operation of the operation switch 32, an operation control signal corresponding to the start of signal generation operation is output, and the transmission circuit 28a.

It is applied to the unit stage 9 via the transmission cable 8 via the transmission connector 28c. The unit station 9 transmits this transmission signal to the transmission connector 26c.

The signal is converted into an electrical control signal and provided to the control unit 18 via the transmission/reception circuit 26b. Based on this signal, the control unit 18 energizes the exciting coil 20 to turn on the electromagnetic contactor 14 . Therefore, the three-phase induction motor 3 is operated by being supplied with power from the main circuit 11 via the main circuit cable 17. At the same time, the control section 18 turns on the operation display lamp 21 in the intermediate device 2 and provides an operation display signal to the unit station 9. Uni! - The station 9 converts the operation display signal into a transmission signal and sends it to the local station 10 via the transmission cable 8 via the transmission circuit 26a and the transmission connector 26c. As a result, the local station 10 connects the transmission connector 28c and the transmission/reception circuit 2 as described above.
8b, the control contact 29a is turned on, and the operation indicator lamp 29 is turned on. The unit station 9 also sends a transmission signal indicating the operating state to the master station 7 of the central operation panel 5 via the transmission cable 8.

Furthermore, when the stop switch 33 is turned on to stop the three-phase induction motor 3, the signal generating circuit 33a outputs an operation control signal corresponding to the operation stop operation, and based on this, the operation is performed in the same manner as during the operation operation described above. local station 10. Transmission cable 8. A control signal is sent to the control section 18 via the unit station 9. As a result, the control unit 18 cuts off the power to the excitation coil 20, turns off the electromagnetic contactor 14, stops the three-phase induction motor 3, turns off the operation indicator lamp 21, and turns off the stop indicator lamp 22. Turn it on. Then, a control signal corresponding to this operation stop operation is transmitted to the unit station 9 and the transmission cable 8.
to the local station 10, thereby lighting up the operation indicator lamp 30. The unit station 9 also sends a transmission signal indicating an operation stop I- to the central operation panel 5 via the transmission cable 8.

According to this embodiment, the control unit 18 is provided in the unit device 2.
A plurality of on-site operation panels 4 are provided, and this control unit 18 controls a plurality of field operation panels 4
As well as reading the operation priority of the , the operation contents are read, and a control signal according to the operation contents is given to the unit device 2, the field operation panel 4, and the central operation panel 5 to control these. , when there is an operation on the on-site operation panel 4, the signal transmission path for actually controlling the operation from the point of operation is only between each on-site operation panel 4 and the unit device 2, so = phase induction Motor control can be speeded up. In addition, the control contents handled by the control unit 18, that is, the priority and operation, the reading of the operation contents, and the control according to the operation contents, are controls for the field operation panel 4 belonging to one three-phase induction motor 3. Compared to the conventional system in which these are controlled by a central operation panel, both the hardware and software can be simplified, and the control function of the control unit 18 can be extremely easily configured with a single-chip microcomputer as in this embodiment. Therefore, it is also possible to reduce costs.

[Effects of the Invention] As is clear from the above description, the present invention improves the process from the point of operation to the actual control of operation when a three-phase induction motor is controlled by operation on a field operation panel. The time can be shortened, the control configuration can be simplified, and costs can be reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an electric circuit diagram including some blocks, Fig. 2 is a diagram schematically showing a signal transmission path, and Fig. 3 is an arrangement state of each device. FIG. 4 is a front view of the address switch. In the figure, 1 is a control center, 2 is a unit device, 3 is a three-phase induction motor (electrical equipment), 4.4a, 4b are field operation panels, 5 is a central operation panel, 6 is a programmable controller, 7 is a master station, 8 is a transmission cable, 9 is a unit station, 10 is a local station,
11 is a main circuit, 18 is a control section, and 34 and 35 are address switches (priority setting switches). Applicant: Toshiba Corporation

Claims (1)

[Claims] 1. A control center equipped with a plurality of unit devices that control, monitor, and protect the operation of electrical equipment, a plurality of field operation panels placed near the electrical equipment, and control status and field operations by the plurality of unit devices. A control system for electrical equipment that is equipped with a central control panel that collectively controls the operation status of the panels, and that a priority setting switch is provided for each of the plurality of on-site operation panels to prioritize on-site operations. The system is characterized in that the unit device is provided with a control section that reads the setting contents of the priority setting switch and the operation contents of the field operation panel and controls the unit device, the field operation panel, and the central operation panel. control system for electrical equipment.