JPH09331301A - Maintenance management system for control center - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the maintenance management system of the control center which is configured at a low cost and in which a degree of freedom in the maintenance management job is enhanced. SOLUTION: Each of three programmable controllers 6 of the control center 1 installed in a central control room obtains various data with respect to drive control of each motor 3 collected by a plurality of motor protection relays 2 contained in the control center 1 and stores the data. Upon the receipt of a transmission request signal from a personal computer 8 installed in an office room, the programmable controller 6 sends the stored various data to the personal computer 8 in a radio wave signal. The personal computer 8 displays the received various data on a display device 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control provided with a maintenance management device for transmitting and receiving maintenance management data to and from a control center containing a plurality of protection devices for collecting various data relating to load operation control. The maintenance management system of the center.

[0002]

The control center has a plurality of motor protection relays (protection devices) inside its housing. The motor protection relay controls the opening and closing of a main circuit contact provided between the main circuit and a motor as a load to start or stop the motor or protect it. Further, the motor protection relay collects various data such as load current value, ground fault current, presence / absence of open phase of the motor in operation, and the data is connected to a programmable controller connected via a transmission line. It is designed to be sent to.

When a plurality of such control centers are installed, for example, a system for maintaining and managing them is constructed as follows. That is, the programmable controllers of each control center are connected by a transmission cable, and the transmission cable is connected to a personal computer (hereinafter referred to as a personal computer) as a maintenance management device via a conversion adapter. Then, the data communication performed by RS-485 between the programmable controllers is performed by RS.
It is configured to convert to the 232C format and send it to the personal computer.

In the above-mentioned configuration, the plurality of motor protection relays in each control center collect data on the operating state of each motor and transmit it to the programmable controller. When the programmable controller obtains the transmitted data, the programmable controller controls the operation of the motor according to the data and transmits the data to the personal computer. The personal computer is designed to display the transmitted data of each motor on a display and to print out the data on a printer as needed.

In such a maintenance management system, it is necessary to connect a personal computer and each programmable controller with a transmission cable, which requires a cost for the transmission cable and its wiring work, and there is a problem that the system becomes expensive.

Further, since there is a restriction on the connection length of the transmission cable, each control center and personal computer are usually placed together in a central control room of a factory. It was necessary to move to the central control room.

The present invention has been made to solve the above problems, and
An object of the present invention is to provide a maintenance management system for a control center which can be constructed at low cost and which can increase the degree of freedom of maintenance management work.

[0008]

In order to achieve the above object, a maintenance management system for a control center according to claim 1 is provided between a main circuit and a load and a function for collecting various data relating to operation control of the load. Via a control center containing a plurality of protective devices having the function of controlling the opening and closing of the main circuit contacts to protect the load, and a plurality of protective devices housed in the control center and the transmission line. A programmable controller that is connected, receives and stores various data of the load, and controls the operation of the load according to a control program that is input in advance,
A center-side communication device that transmits various data output from this programmable controller as a transmission signal by an air propagation signal, a management-side communication device that can receive the transmission signal transmitted by this center-side communication device, and this management-side communication It is characterized in that it comprises a maintenance management device for displaying various data received by the device.

According to this structure, various data relating to the operation control of each load collected by each of the plurality of protection devices are received and stored by the programmable controller via the transmission line. The programmable controller transmits the stored data to the management-side communication device via the center-side communication device by an air propagation signal, and the transmitted various data are displayed on the maintenance management device. Therefore, it is possible to easily transmit the data of each load possessed by a large number of protection devices to the maintenance management device without being connected by a transmission cable.

The management side communication device is provided so that the setting signal of the protection device set by the maintenance management device can be transmitted by the air propagation signal, and the center side communication device is provided so that the setting signal can be received. Alternatively, when a setting signal is given via the center-side communication device, the function may be set according to the setting signal. According to this structure, the maintenance management device can individually set the function for each of the many protection devices (claim 2).

The protection device may be provided with a non-volatile storage means for storing the setting of the function corresponding to the setting signal transmitted from the maintenance management device. Even if the power is turned on, the function setting information of the protection device once performed by the maintenance management device is saved, so that it is not necessary to perform the function setting each time the power is turned on again (claim 3).

A maintenance management device is provided so that an operation start or operation stop signal of a load can be transmitted by an air propagation signal via a communication device on the management side, and a protective device transmits an operation start or operation stop signal via a communication device on the center side. If received, the load may be started or stopped according to the start or stop signal. According to this structure, the maintenance management device can individually control the start and stop of the operation for each of a large number of loads (claim 4).

The maintenance management device is configured such that the transmission request signal can be transmitted by the air propagation signal via the management side communication device, and the programmable controller receives the transmission request signal via the center side communication device. It may be configured to transmit various data of the load collected by the protection device. According to this structure, the data transmission management on the control center side is facilitated, and the communication control is facilitated even when communicating with a plurality of programmable controllers (claim 5).

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 3 is a diagram showing the overall configuration of the maintenance management system. The control center 1 has a plurality of motor protection relays (protection devices) 2 inside its housing. Motor protection relay 2
Is a function of collecting various data such as load current value, ground fault current, presence / absence of open phase, etc. regarding the operation control of a motor (for example, an induction motor, only one is shown in FIG. 3) 3 as a load as described later. It also has a function of protecting the motor 3 when it is determined that it is necessary.

The plurality of motor protection relays 2 of the control center 1 are connected to a master station 5 via a transmission line 4 composed of a twisted pair cable or the like. The master station 5 is connected to the programmable controller 6 via a data bus and a dual port memory (neither of which is shown) so that data can be transmitted and received.

The programmable controller 6 transmits / receives data to / from the motor protection relay 2 via the master station 5 to monitor the operating state of the motor 3 and control the operation of the motor 3 in accordance with a control program input in advance. To do. The programmable controller 6 is also connected to a communication device (center-side communication device) 7 so that data can be transmitted and received.

The communication device 7 has an antenna 7a, and FM-modulates a carrier wave by the data transmitted from the programmable controller 6 and transmits it as a radio wave signal (airborne signal) from the antenna 7a. Further, the communication device 7 demodulates the FM modulated signal received via the antenna 7a and outputs the demodulated signal to the programmable controller 6. The above constitutes the control center 1, and three such control centers 1 are collectively installed in, for example, three centralized control rooms.

On the other hand, one personal computer (hereinafter referred to as a personal computer) 8 is installed as a maintenance management device in a room different from the central control room, such as an office room.
When the personal computer 8 receives the FM modulated signal transmitted from the control center 1 side by the antenna 9a, it demodulates the received signal and displays it on the display 10 as described later.

FIG. 2 shows a detailed electrical structure centering on the motor 3 and the motor protection relay 2 which are one unit inside the control center 1. Also, FIG.
1 schematically shows a connection state between the programmable controller 6 and a plurality of motor protection relays 2 in one control center 1 and a functional block showing an electrical configuration of the personal computer 8.

In FIG. 2, a three-phase power supply bus (see FIG.
3 is omitted in FIG. 3 and is shown as one).
In the main circuit 12 between the motor and the motor 3, the circuit breaker 1 for wiring
3, an electromagnetic contactor 14 for opening and closing the main circuit contact 12a, a current converter 15 for detecting the main circuit current, and a zero-phase current transformer 16 for detecting the ground fault current are provided. The primary side of the transformer 17 for control power supply is connected to the load side of the wiring breaker 13 of the main circuit 12, and the control buses 18 and 19 are provided to the secondary side of the transformer 17. There is.

The motor protection relay 2 has the above-mentioned control bus 1
Power is supplied from the DC power supply circuits 20 to 8 and 19, and a logical operation circuit 21 including a microcomputer is mainly configured. The logical operation circuit 21 receives each ON signal from the starting operation switch 22, the stopping operation switch 23, and the normally open auxiliary contact 14a of the electromagnetic contactor 14 via the input circuit 24, and also converts the current. The signals from the transformer 15 and the zero-phase current transformer 16 are respectively converted into A / D conversion circuits 2
5 and the failure detection circuit 25a, and the operation coil 14b is controlled to switch on and off through the output circuit 26. The failure detection circuit 25a detects a failure current and a failure voltage based on the output of the A / D conversion circuit 25,
The detection result is output to the logical operation circuit 21.

In the logical operation circuit 21, a control program for protection operations such as overcurrent, open phase, undercurrent, ground fault, and instantaneous power failure restart, timed restart, etc. is stored in an internal ROM. Further, the logical operation circuit 21 is connected to an EEPROM 27 which is a non-volatile storage means. The setting circuit 28 configured by an input key or the like sets the function of the motor protection relay 2 to the logical operation circuit 21, that is, the overcurrent,
This function sets the function to protect against phase loss, undercurrent, ground fault, etc. The data by this setting is EEPRRO.
It is designed to be stored in M27.

The logical operation circuit 21 reads the control program and the function setting data from the internal ROM and the EEPROM 27 in the initial processing, and then reads them out.
The data is transferred to the AM and the protection and control operations based on the various input signals described above are executed.

The display section 29, which is composed of, for example, a 7-segment LED, is provided for displaying the execution status of the protection operation by the logical operation circuit 21, the opening / closing status of the electromagnetic contactor 14, and the like. The function data stored in can also be displayed. Further, the unit station 30 is connected to the transmission line 4, and in order to transmit and receive data between the programmable controller 6 and the logical operation circuit 21 which are connected to the transmission line 4 via the master station 5. It is provided (see FIG. 1).

In FIG. 1, the personal computer 8 is mainly composed of a control unit 32 including a CPU, a keyboard 33 as an input device, a storage device 34 including a memory and a hard disk, and a display 10 as a display device. ing. The personal computer 8 also includes a communication device (management-side communication device) 9 and an antenna 9a having the same functions as the above-described communication device 7 and its antenna 7a. The modulation and demodulation signals are input and output.

Next, the operation of this embodiment will be described.
As described above, the operator can set the function of each motor protection relay 2 by individually operating each setting circuit 28, but operates the keyboard 33 of the personal computer 8 installed in the office. By doing so, it is also possible to set the function by designating the specific motor protection relay 2 in the specific control center 1 and inputting the function setting data. In this case, the input function setting data is transmitted from the antenna 9a of the communication device 9 as an FM modulated signal (setting signal) including address information designating the specific control center 1.

Then, the transmitted signal is received by each communication device 7 in the centralized control room in which each control center 1 is installed. When the communication device 7 of the specific control center 1 recognizes that the address information included in the received FM modulated signal is assigned to itself, the programmable controller 6 outputs the data obtained by demodulating the FM modulated signal. Output to. The programmable controller 6 causes the master station 5 to transmit the given data (function setting data) onto the transmission line 4.

The function setting data also includes address information for designating the specific motor protection relay 2, and the unit station 30 built in the specific motor protection relay 2 is located on the transmission line 4. When the address included in the transmitted data matches its own, the function setting data is fetched. Then, the logical operation circuit 21
Reads the function setting data fetched by the unit station 30 and writes it in the work area of the internal RAM, and also writes it in the external EEPROM 27 for storage.

When the operator inputs and transmits a start signal for the motor 3 connected to the specific motor protection relay 2 from the personal computer 8, the start signal is used for the specific motor protection along the same path as above. It is transmitted to the relay 2. Then, the logical operation circuit 21 energizes the operating coil 14b through the output circuit 26, and the electromagnetic contactor 14 closes the main circuit contact 12a to start the motor 3. The motor 3 can also be started by individually operating the start switch 22 of each motor protection relay 2.

When the motor 3 is started and the operation is started,
The logical operation circuit 21 sequentially detects various values relating to the operation control of the motor 3, such as a main circuit current value and a ground fault current value, and writes and stores them in the RAM to collect them. Then, when there is a data transmission request from the programmable controller 6, the various collected data are transmitted to the programmable controller 6 via the unit station 30.

According to the control program, the programmable controller 6 sequentially transmits a data transmission request to each motor protection relay 2 at regular time intervals to obtain the various data described above, and stores and retains them in the internal RAM. An operation control command for each motor 3 is given to each motor protection relay 2 as necessary according to the data.

On the other hand, when the operator needs to obtain various data regarding the operation control of each motor 3 for maintenance management, the operator operates the personal computer 8 to send a transmission request signal to each control center 1. Send them individually. Receiving the transmission request signal, the programmable controller 6 of each control center 1 transmits to the personal computer 8 various data regarding each motor 3 transmitted from each motor protection relay 2 which is stored and held inside. The personal computer 8 displays various transmitted data on the display 10, and prints out to a printer (not shown) connected to the personal computer 8 as necessary.

Then, when the operator determines that the operation of the specific motor 3 needs to be stopped, the stop signal for the specific motor 3 is input from the personal computer 8 and transmitted, as in the case of starting. The stop signal is transmitted to the logical operation circuit 21 of the specific motor protection relay 2 and the operating coil 14b is disconnected via the output circuit 26, so that the electromagnetic contactor 14 opens the main circuit contact 12a. The operation of the motor 3 is stopped. The motor 3 can also be stopped by individually operating the stop switch 23 of each motor protection relay 2.

As described above, according to this embodiment, each programmable controller 6 of the three control centers 1 installed in the centralized control room has a plurality of motor protection relays housed in the corresponding control center 1. When various data concerning the operation control of each motor 3 collected by 2 is stored, the data is stored and held, and when the transmission request signal is transmitted from the personal computer 8 installed in the office, it is transmitted to the personal computer 8 by a radio signal, The personal computer 8 displays various received data on the display 10.

Therefore, by transmitting the data of each motor 3 possessed by a large number of motor protection relays 2 to the personal computer 8 by a radio wave signal, each programmable controller 6 and the personal computer 8 are different from the conventional ones. Since it is not necessary to connect with a cable for data transmission, the cost required for the cable and its wiring work can be reduced.

Further, since the personal computer 8 does not need to be installed in the central control room where each control center 1 is installed, the operator can easily perform maintenance work in the office without going to the central control room. Can be done. Further, since the programmable controller 6 transmits various data stored and held by a radio wave signal when the transmission request signal is transmitted from the personal computer 8, even when there are a plurality of programmable controllers 6, the data transmission management control can be performed. It will be easy.

In addition, according to this embodiment, by inputting necessary data from the personal computer 8 and transmitting it to the control center 1 side, the function setting or the specific motor protection relay 2 in the specific control center 1 can be set. Since it is possible to directly start or stop the specific motor 3,
A large number of motor protection relays 2 and motors 3 can be centrally controlled from the personal computer 8, and maintenance work can be further facilitated.

Further, according to the present embodiment, the logical operation circuit 21 of the motor protection relay 2 stores the function setting corresponding to the setting signal transmitted from the personal computer 8 in the EEPROM 27. Even if the power of 2 is cut off, the information regarding the function setting once performed by the personal computer 8 is not lost, so when the power is turned on again, the function setting is performed based on the data stored in the EEPROM 27. Therefore, the maintenance work can be further facilitated.

The present invention is not limited to the embodiments described above and shown in the drawings, but the following modifications or expansions are possible. When the transmission request signal is transmitted from the personal computer 8, the programmable controller 6 is configured to transmit various data stored and held by radio signals, but each programmable controller 6 transmits the personal computer at different transmission timings at regular intervals. You may make it transmit to the 8 side. With such a configuration, various data can be automatically received and used on the personal computer 8 side without the operator having to operate the personal computer 8 in particular.

A function capable of setting the function of the motor protection relay 2 or starting or stopping a specific motor 3 by inputting necessary data from the personal computer 8 may be provided as necessary. Further, the EEPROM 27 may be provided if necessary. The communication device 9 may be configured separately from the personal computer 8 and may be connected and used outside the personal computer 8. The number of control centers 1 and programmable controllers 6 provided corresponding thereto is not limited to three, and two or less or four or more can be applied. The modulation / demodulation method of the communication devices 7 and 9 is not limited to FM
M or PM or various pulse modulation may be used. An optical signal or an ultrasonic signal may be used as the airborne signal.

[0041]

Since the present invention is as described above,
The following effects are obtained. According to the maintenance management system of the control center of claim 1, the programmable controller provided corresponding to the control center accommodating a plurality of protection devices controls the operation of the load received and stored from the plurality of protection devices. When various data relating to the above are transmitted by an air propagation signal as a transmission signal, the maintenance management device receives the transmission signal and displays the various data, so unlike the conventional art, each programmable controller and maintenance management device Since it is not necessary to connect with a transmission cable, the cost required for the cable and its wiring work can be reduced, and the degree of freedom in maintenance work can be increased.

According to another aspect of the maintenance management system of the control center of the present invention, the maintenance management device transmits the setting signal of the protection device by the air propagation signal, and when the protection device receives the setting signal, the maintenance management device changes the setting signal. Since the function setting is performed according to the function setting, the function setting of a large number of protection devices can be individually performed from the maintenance management device, and the maintenance management work can be facilitated.

According to the maintenance management system of the control center of the present invention, the protection device stores the setting of the function corresponding to the received setting signal from the maintenance management device in the non-volatile storage means. Even if the power is cut off, the information of the function setting once performed by the maintenance management device is saved, so that the maintenance management work can be facilitated.

According to another aspect of the maintenance management system for the control center of the present invention, the maintenance management device transmits a load operation start or stop signal by an air propagation signal, and the protection device receives the received start or stop operation. Since the loads are started or stopped in accordance with the signal, the maintenance management device can individually start or stop the loads, and the maintenance work can be further facilitated.

According to another aspect of the maintenance management system of the control center of the present invention, the maintenance management device transmits the transmission request signal by the air propagation signal, and the programmable controller receives various data of the load when receiving the transmission request signal. Since the data is transmitted, the data transmission management control on the control center side becomes easy.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an electrical configuration of a control center, a programmable controller, and a personal computer in an embodiment of the present invention.

FIG. 2 is an electrical configuration diagram centering on a motor and a motor protection relay.

[Figure 3] Overall configuration diagram of the maintenance management system

[Explanation of symbols]

1 is a control center, 2 is a motor protection relay (protection device), 3 is a motor (load), 4 is a transmission line, 6 is a programmable controller, 7 is a communication device (center side communication device), and 8 is a personal computer (maintenance management). Device), 9 is a communication device (management side communication device), 12 is a main circuit, 12a is a main circuit contact, and 27 is an EEPROM (storage means).

Claims (5)

[Claims] 1. A plurality of protective devices having a function of collecting various data relating to operation control of a load and a function of controlling opening / closing of a main circuit contact provided between the main circuit and the load to protect the load. The control center that is housed therein is connected to the plurality of protection devices housed in the control center through a transmission line, receives and stores various data of the load, and stores the data according to a control program that is input in advance. A programmable controller that controls the operation of the load, a center-side communication device that transmits the various data output from this programmable controller as a transmission signal by an air propagation signal, and a transmission signal that is transmitted by this center-side communication device can be received Management side communication device and the various data received by this management side communication device. Maintenance management system of the control center, characterized in that it is composed of a maintenance device. 2. The management-side communication device is provided so as to be able to transmit the setting signal of the protection device set by the maintenance management device by an air propagation signal, and the center-side communication device is provided so as to be able to receive the setting signal. 2. The maintenance management system for a control center according to claim 1, wherein the protection device sets a function according to the setting signal given through the communication device on the center side. 3. The maintenance of the control center according to claim 2, wherein the protection device comprises a non-volatile storage means for storing the setting of the function according to the setting signal transmitted from the maintenance management device. Management system. 4. The maintenance management device is provided so as to be able to transmit an operation start or operation stop signal of a load by an aerial propagation signal via a communication device on the management side, and a protective device transmits the operation start or operation stop signal to the center side. The maintenance management system for a control center according to any one of claims 1 to 3, characterized in that, when received through the communication device, the load is started or stopped according to the operation start or stop signal. 5. The maintenance management device is provided so that a transmission request signal can be transmitted by an aerial propagation signal via a management side communication device, and the programmable controller receives the transmission request signal via the center side communication device. The maintenance management system for a control center according to any one of claims 1 to 4, wherein various data of load collected by the protection device is transmitted.