JP2003070286A - Motor driver having character information display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor driver having a display on which a character is displayed upon the occurrence of an abnormality or at an arbitrary timing and the content of display can be set. SOLUTION: The motor driver 2 connected between a motor 1 and a controller 3 and driving the motor 1 according to a command from the controller 3 comprises a display 23 capable of displaying a character string, a section 32 for controlling the display content of the display 23, means 33, 34 and 35 generating event numbers for designating alteration of the display content, and means for storing a character string table 31 listing display character strings which can be set to input in correspondence with the event number. Upon receiving an event number from the event number generating means, the display content control section 32 acquires a display character string corresponding to the event number with reference to the character string table 31, and displays the character string on the display 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor drive device equipped with a character information display device, and more particularly to an electric motor drive device equipped with a display device for displaying various character information prepared in advance at arbitrary timing. .

[0002]

2. Description of the Related Art An electric motor drive device is a device which is interposed between a higher-order control device such as a PLC (programmable controller) and an electric motor and drives the electric motor in accordance with a command from the control device. It may be called a servo driver.

This kind of electric motor drive device is equipped with a simple indicator to inform the user of the occurrence of an abnormality by means of an abnormality display (also called an alarm display). The conventional motor drive device has a 7-segment display with several digits per line, and the content of the error display is an error number (error code).
Was commonly displayed. For example, "E" for error
Is followed by a 1-digit or multi-digit number (abnormal number).

As described above, the display provided in the conventional electric motor drive device is simple, and the display content is extremely limited. It was not possible to display the content (meaning) of the abnormality or set the display content by the user.

[0005]

For example, regarding the display when an abnormality occurs, the conventional motor drive device only displays the abnormality number as described above, and the user can indicate the specific content of the abnormality in the motor drive device. It was not possible to know it only from the display of. Therefore, the user must refer to the instruction manual, etc. to identify the details of the abnormality and then take appropriate action.
There was a problem that it took time to restore the normal operation.

[0006] In addition, regarding the measures to be taken when an abnormality occurs, or in other situations, the contents which one user (supervisor) wants to instruct to another user (worker) are displayed on the display of the motor drive device. There was a request to do it.

The present invention has been made in view of the above conventional problems, and an electric motor having a display device capable of displaying characters when an abnormality occurs or at any other timing and setting the display contents. An object is to provide a drive device.

[0008]

An electric motor drive device provided with a display device for character information according to the present invention includes a display device capable of displaying a character string, a display content control unit for controlling the display content of the display device, The display content control unit includes an event number generation means for generating an event number for instructing a change in display content, and a storage means for storing a character string table in which display character strings that can be input and set are associated with the event number. When an event number is given from the event number generating means, a display string corresponding to the event number is acquired by referring to the character string table, and the acquired display character string is displayed on the display device.

With such a configuration, the user can know the content of the abnormality, the appropriate processing method, and the like simply by looking at the display of the electric motor drive device. Further, by inputting and setting an appropriate display character string corresponding to the event number, it becomes possible to utilize the display device of the electric motor drive device as an instruction means or a transmission means from an operator to another operator.

Preferably, a communication unit is provided for connecting to a support device used for input setting of a display character string included in the character string table. By using a support device such as a personal computer (and dedicated software), it becomes easy to design an interface for inputting and setting the display character string, and the user can easily perform the inputting and setting work.

It is also preferable that a new event number and display character string can be registered in the character string table. That is, it is preferable that the character string table is stored in a storage unit such as a rewritable flash memory so that the character string table can be updated or added. As a result, it is possible to easily cope with the necessity of adding a new event number and a corresponding display character string.

In a preferred embodiment, the event number generating means is a motor controller connected to the motor,
The event number is an abnormal number given from the motor control unit to the display content control unit.

In another embodiment, the event number generating means is a motor controller connected to the motor, and the event number is controlled by the motor controller when the operation of the motor satisfies a predetermined event occurrence condition. It is an identification number given to the department. In this case, the event occurrence condition is
It is preferable that the input can be set using the support device.
Similar to the input setting of the display character string, by using the support device such as the personal computer (and the dedicated software) for the event occurrence condition, the interface can be easily designed and the input setting work can be performed for the user. It will be easier.

In still another embodiment, the event number generating means is a communication unit that controls communication with the control device, and the event number is given from the electric control device to the display content control unit via the communication unit.

In still another embodiment, the event number generating means is a timekeeping section which outputs a signal at a set time,
The event number is generated when the internal time reaches the set time.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an electric motor system including an electric motor drive device having a display device according to an embodiment of the present invention. The electric motor drive device 2 is provided with a connector 21 for connecting the electric motor and a connector 22 for connecting the control device, and the electric motor 1 and the control device (PLC) 3 are connected to the respective connectors. The control device 3 controls the operation of the electric motor 1 via the electric motor drive device 2. Further, the motor drive device 2 is also provided with a connector 26 for connecting the support device 4 such as a personal computer. A dedicated port is used for the connector 21 with the electric motor 1, and a serial port such as RS-232C is used for the connector 22 with the control device 3 and the connector 26 with the support device 4.

The electric motor drive device 2 includes a display device 23 capable of displaying a character string and operation keys 24. As the display device 23, a dot matrix type liquid crystal display module is used in one embodiment, and a character string including alphanumeric characters, symbols and katakana can be displayed over four lines. The operation keys 24 include a plurality of keys (push button switches) for scrolling a character string displayed on the display device 23 and switching display contents.

The display device 23 of the electric motor drive device 2 displays the operating state of the electric motor 1 or the electric motor drive device 2 on a monitor during normal operation and switches to the display of a character string prepared in advance when an abnormality or other event occurs. Replace

FIG. 2 is a view showing a display example by the display device 23. (A) is an example of a monitor display of the operating state during normal operation, in which the motor speed and target position number are displayed. (B) is a display example when an event (abnormality) occurs,
The top two lines indicate that an overload abnormality has occurred.
The bottom two lines indicate that the electromagnetic brake should be released as a countermeasure for the abnormality.

FIG. 3 shows a display device 23 of the motor drive device 2.
FIG. 6 is a block diagram showing an operation related to display control according to FIG. The motor drive device 2 includes a display device 23 and operation keys 2.
4, a character string table storage unit 31, a display content control unit 32, an electric motor control unit 33, a communication unit 34, and a real time clock (RTC) 35 are provided. A rewritable semiconductor memory such as a flash memory is used as the storage means 31 of the character string table. In the following description, it may be referred to as a character string table 31. The real-time clock 35 corresponds to a clock unit and outputs a predetermined signal when the internal time reaches a set time.

The electric motor control unit 33 is a portion connected to the electric motor 1 and corresponds to an event number generating means. When an abnormality occurs in the operation of the electric motor 1, the electric motor control unit 33 generates the abnormality number and gives it to the display content control unit 32 as an event number. The event number mentioned here is for instructing the change of the display content, and the event content informs the display content control unit 32 of the change timing of the display content and the display content. Electric motor control unit 3
In addition to the abnormal number, 3 provides the display content control unit 32 with an identification number, which means that a predetermined operation condition is satisfied, as an event number. For example, when the rotation speed exceeds 2000 rpm, a predetermined identification number is given to the display content control unit 32 as an event number. In addition to the motor control unit 33, there is a device for generating an event number (event number generation means), which will be described later.

The character string table 31 is a table in which a display character string including a fixed character string and an arbitrary character string associated with an event number is described. Display content control unit 32
When the event number is given from the event number generation means such as the electric motor control unit 33, the character string table 31 is referred to obtain the display character string corresponding to the event number,
The acquired display character string is displayed on the display device 23.

FIG. 4 is a diagram showing an example of the character string table 31. The character string table 31 has fields for event numbers, fixed character strings, and arbitrary character strings. For example, a fixed character string "Kafuka Keikoku" and an arbitrary character string "Denge Brake Wake Up" are associated with the event number "00". When the event number “00” is given, the display content control unit 32 acquires from the character string table 31 a display character string consisting of a fixed character string “Kafuka Keikoku” and an arbitrary character string “Denge Brake And display device 2
Display in 3.

In the character string table 31 of FIG. 4, fixed character strings are fixed in principle and cannot be freely changed by the user. On the other hand, the user can freely set the arbitrary character string. The input of the arbitrary character string is performed using the support device 4 shown in FIG. The support device 4 is a personal computer in which dedicated software is installed. Alternatively, a dedicated character input console may be connected as the support device 4.

In the example of the character string table 31 shown in FIG.
The arbitrary character string corresponding to the event number 02 is acquired from PLC3 which is a higher-order control device. That is, the display content control unit 32 designates a predetermined address of the PLC 3 via the communication unit 34 instead of the internal memory address where the arbitrary character string of the character string table 31 is stored, and displays the display corresponding to the arbitrary character string. Get a string. In this case, the acquisition destination address of the character string may be described in the field of the arbitrary character string corresponding to the event number 02. Alternatively, a table of acquisition address of an arbitrary character string corresponding to each event number 02 is separately created by the support device 4, and the motor drive device 2
You may make it memorize | store in.

Next, another example of event number generation will be described. FIG. 5 is a table showing an example of event numbers other than the abnormal numbers that the motor drive device 2 can obtain alone.
In this chart, the event content corresponding to the event number and the setting example of the event generation condition are shown. For event number 10, the real-time clock 35 is generated when the internal time reaches 8:00. That is, the real-time clock 35 functions as an event number generation means,
Event number 1 when the internal time is 8:00 (set time)
A predetermined signal is output as 0.

The event numbers 11 to 16 correspond to identification numbers given to the display content control unit 32 from the electric motor drive device 2 when the operation of the electric motor 1 satisfies a predetermined event occurrence condition. That is, when the operation of the electric motor 1 satisfies the predetermined event occurrence condition, the corresponding identification number (event number) is changed from the electric motor control unit 33 to the display content control unit 32.
Given to. For example, the event number 11 occurs when the current rotation speed is 2000 rpm or more, and the event number 12 has an absolute position of 300 which is a movement amount from the origin.
It occurs when it becomes 00 rev or more. Event number 13 occurs when the estimated load moment converted from the amount of change in speed and the amount of change in current becomes 30 times or more. Event number 14 occurs when the load current when the rating of the electric motor is 100% is 80% or more. Event number 15 occurs when the load torque becomes 80% or more when the motor rating is 100%. Event number 16 occurs when the internal voltage during regenerative operation of the electric motor reaches 350 V or higher.

FIG. 6 is a chart showing an example of event numbers given from the control device 3 connected via the communication section 34. In this case, the communication unit 34 functions as an event number generation means. Similar to FIG. 5, the event content corresponding to the event number and the setting example of the event generation condition are shown. Event number 20 occurs when the time of the real-time clock built into the control device reaches 8:00. Event number 21 occurs when RLY (relay) number 1000 is turned on. Event number 22 is 200 for DM (data memory) 100
Occurs when it reaches zero. Event number 23 is CT
It occurs when the value of H (high speed counter) reaches 1,000,000. The RLY, DM, and CTH correspond to a bit device, a word device (16 bits), and a double word device (32 bits), which are typical devices of the control device (PLC) 3.

An example of the character string table 31 for some of the event numbers shown in FIGS. 5 and 6 is shown in FIG. The character string table 31 does not have a fixed character string field but only an arbitrary character string field that can be input and set. Similar to the character string table 31 shown in FIG. 4, the user can freely input and set an arbitrary character string using the support device 4. Also, the user can freely input and set the event occurrence conditions shown in FIGS. 5 and 6 by using the support device 4.

In FIG. 7, the arbitrary character string corresponding to the event number 21 is acquired from the PLC 3 which is the higher-level control device. Therefore, in the arbitrary character string field of the event number 21, the predetermined addresses DM0 to DM7 of the PLC 3 are stored.
Is listed.

FIG. 8 is a table showing an example of character strings stored at addresses DM0 to DM7 in the data memory of PLC3. Data of one character in katakana is stored in each address as an arbitrary code. The display content control unit 32 of the motor driving device 2 reads the addresses DM0 to DM7 of the data memory of the PLC 3 via the communication unit 34,
Get the display string "Pepper Hussey".

The color of the character string displayed on the display device 23 and the display method (for example, lighting or blinking) may be properly used according to the event number. FIG. 9 is a chart showing an example in which the display color and the blinking display are selectively used according to the event number.
The user can freely input and set such display colors and display methods using the support device 4.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be implemented in various forms. For example, the character string displayed on the display device 23 is not limited to alphanumeric characters, symbols, and katakana, and hiragana and kanji may be used. Also, the number of characters and lines to be displayed may be increased as much as cost and space allow. In addition, the display content control unit 3 in the block diagram of FIG.
2, the motor control unit 33, the communication unit 34, the real-time clock 35, etc. can be realized by a microcomputer. The storage means (nonvolatile memory) of the character string table 31 can also be incorporated in the microcomputer.

[0035]

As described above, according to the electric motor drive device of the present invention, the user can know the details of the abnormality and the appropriate processing method by just looking at the display of the electric motor drive device. Become. Further, by inputting and setting an appropriate display character string corresponding to the event number, it becomes possible to utilize the display device of the electric motor drive device as an instruction means or a transmission means from an operator to another operator.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an electric motor system including an electric motor drive device including a display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a display example by a display device.

FIG. 3 is a block diagram showing an operation relating to display control by a display device of the electric motor drive device.

FIG. 4 is a chart showing an example of a character string table.

FIG. 5 is a chart showing an example of event numbers other than the abnormality number that can be acquired by the electric motor drive device alone.

FIG. 6 is a chart showing an example of event numbers given from a control device connected via a communication unit.

FIG. 7 is a chart showing an example of a character string table for some of the event numbers shown in FIGS. 5 and 6;

FIG. 8 is a chart showing an example of a character string stored at a predetermined address in the data memory of the control device.

FIG. 9 is a chart showing an example in which a display color and a blinking display are selectively used according to an event number.

[Explanation of symbols]

1 electric motor 2 Electric motor drive 3 control device 4 support devices 23 Display 24 operation keys 31 Character string table (storage means) 32 Display content control unit 33 Electric motor control unit (event number generation means) 34 Communication unit (event number generation means) 35 Clock part (event number generation means)

Claims (8)

[Claims] 1. A motor drive device which is connected between an electric motor and a control device and drives the electric motor in accordance with a command from the control device, the display device being capable of displaying a character string, and the display contents of the display device. A display content control unit for controlling the display content, an event number generation unit for generating an event number for instructing a change in the display content, and a storage of a character string table in which display character strings that can be input and set corresponding to the event number are described The display content control unit, when the event number is given from the event number generation unit, acquires the display character string corresponding to the event number by referring to the character string table, and acquires the acquired display character. An electric motor drive device comprising a character information display device, wherein a column is displayed on the display device. 2. The character information display device according to claim 1, further comprising a communication unit for connecting to a support device used for input setting of a display character string included in the character string table. Equipped with a motor drive. 3. The electric motor drive device having the character information display device according to claim 1, wherein a new event number and a display character string can be registered in the character string table. 4. The event number generation means is a motor control unit connected to the motor, and the event number is
An electric motor drive device provided with a character information display device according to claim 1, wherein the abnormal number is given from the electric motor control unit to the display content control unit. 5. The event number generation means is a motor control unit connected to the electric motor, and the event number is
4. The character information display according to claim 1, wherein the character information is an identification number given to the display content control unit from the electric motor control unit when the operation of the electric motor satisfies a predetermined event occurrence condition. Motor drive device equipped with a device. 6. The electric motor drive device having a character information display device according to claim 5, wherein the event occurrence condition can be input and set by using the support device. 7. The event number generation means is a communication unit that controls communication with the control device, and the event number is given from the electric control device to the display content control unit via the communication unit. An electric motor drive device comprising the character information display device according to claim 1, 2, or 3. 8. The event number generating means is a clock unit that outputs a signal at a set time, and the event number is generated when the internal time reaches the set time. An electric motor drive device comprising a display device for displaying character information according to 1, 2, or 3.