JP6279910B2 - Inverter device - Google Patents

Description

  Embodiments described herein relate generally to an inverter device.

  In recent years, inverter devices have come to be equipped with one or more communication means as standard equipment for performing parameter setting or control such as operation / stopping. The parameter is a software setting item for determining the operation and function of the inverter device, and is used by being changed in various ways so that the operation is suitable for a device in which the inverter device is incorporated. As the communication means, for example, wired serial communication such as RS-485 is used.

  As an example of a system, a plurality of inverter devices are connected to each other with a communication cable, and data and control signals are transmitted / received by wired communication with a host controller such as a PLC (Programmable Logic Controller) to set parameters and inverters. Some devices control devices. In order to change the parameters of the inverter device in such a system, when the operation of the system is stopped, the communication cable of the inverter device is connected to an external communication device such as a personal computer, and the parameter is changed from the personal computer.

  However, in a system that operates continuously for 24 hours while communicating with the PLC, to read data such as voltage, current, frequency, torque, etc., or to set parameters using a communication means for maintenance. Requires a communication means different from the communication means used for control. This separate communication means is generally a wired communication means.

  In this case, it is necessary to electrically connect a personal computer to the inverter device in operation that requires data monitoring, parameter change, and the like, using the wired communication means of the different system. Although the inverter device is used while being grounded, the potential of the inverter device varies with respect to the ground potential due to stray capacitance and wiring impedance. On the other hand, external communication devices such as personal computers also have stray capacitance with respect to the ground. As a result, when a personal computer is electrically connected to the inverter device, a pulse current flows through the stray capacitance, and the wired communication for control performed between the PLC and the inverter device is temporarily stopped due to noise. There is a risk of doing.

JP 2013-93954 A

  In order to prevent the above problems when connecting a personal computer, it is necessary to interpose an insulation transformer between the personal computer and the commercial power supply, or to provide a surge absorber for each of the inverter device and the personal computer. However, these measures lead to an increase in size and cost of the apparatus. Further, it is troublesome to individually connect personal computers to a plurality of inverter devices, and depending on the installation environment, it may be difficult to reconnect communication cables with the inverter devices.

  In view of this, an inverter device is provided that can prevent troubles in wired communication when connected to an external communication device, and can reduce the trouble of connecting to the external communication device.

  The inverter device according to the embodiment includes a wireless communication unit that performs wireless data communication with an external communication device, and a wired communication unit that performs wired data communication with another device via a communication line. . The inverter device is provided between the wireless communication means and the wired communication means, and transmits the reception data of the wireless communication means to the wired communication means and transmits the reception data of the wired communication means to the wireless communication means in the closed state. And a gateway for blocking between the wireless communication means and the wired communication means in the open state. The control means closes the gateway when the reception data of the wireless communication means is data for another device, and opens the gateway when the reception data of the wireless communication means is data for the inverter device.

The block diagram of the inverter system which shows 1st Embodiment Communication sequence diagram FIG. 1 equivalent diagram showing the second embodiment 2 equivalent diagram FIG. 1 equivalent view showing the third embodiment

(First embodiment)
A first embodiment will be described with reference to FIGS. 1 and 2. An inverter system 1 shown in FIG. 1 includes a control panel 2, an operation panel 3 disposed on a door of the control panel 2, and a personal computer 4 as an external communication device. Inside the control panel 2, a plurality of inverter devices 5a to 5d, a controller 6, a sensor unit 7, an input / output terminal block 8, and the like are accommodated. The inverter device referred to in the present invention includes an inverter device 5a (inverter body) and an operation panel 3. The operation panel 3 is attached to the inverter device 5a via a cable.

  The inverter devices 5a to 5d, the controller 6, the sensor unit 7, and the input / output terminal block 8 each include a wired communication unit 9, and perform wired data communication with each other via a common communication line 10. . The wired communication unit 9 is a wired communication means according to the RS-485 communication standard, for example.

  The inverter device 5a includes two systems of wired communication units 9 (9a, 9b). The operation panel 3 includes a single-line wired communication unit 9 and a single-line wireless communication unit 11. The personal computer 4 includes a wireless communication unit 11. The wireless communication unit 11 is a short-range wireless communication unit based on a communication standard such as Bluetooth (registered trademark). Wired data communication is possible between the inverter device 5 a and the operation panel 3, and wireless data communication is possible between the operation panel 3 and the personal computer 4. That is, the inverter device 5 a can perform wireless communication with the personal computer 4 through the operation panel 3.

  The inverter devices 5a to 5d are general-purpose inverter devices. The CPU 12 of the inverter devices 5a to 5d executes operation mode setting processing, frequency and torque control, abnormality detection processing, protection operation, communication control, input / output interface control, and the like according to a program stored in a memory (not shown). . The CPU 12 of the inverter device 5a has a function as a gateway 13 that opens and closes a transmission path between the wired communication unit 9b and the wired communication unit 9a, and thus a transmission path between the wireless communication unit 11 and the wired communication unit 9a. Yes.

  In the closed state of the gateway 13, the CPU 12 of the inverter device 5a transmits the reception data of the wired communication unit 9b (that is, the reception data of the wireless communication unit 11) to the wired communication unit 9a, and the reception data of the wired communication unit 9a. The data is transmitted to the personal computer 4 through the wireless communication unit 11 of the operation panel 3. The CPU 12 blocks between the wired communication unit 9b (that is, the wireless communication unit 11) and the wired communication unit 9a when the gateway 13 is open.

  The controller 6 is composed of a PLC. The CPU 14 of the controller 6 controls the operation / stop of the inverter devices 5a to 5d by transmitting a control signal to the inverter devices 5a to 5d. The sensor unit 7 detects, for example, the temperatures inside the inverter devices 5a to 5d and the control panel 2, and transmits them to the inverter devices 5a to 5d and the controller 6 as required. The input / output terminal block 8 is used when a contact input / output is added. The operation panel 3 includes an LCD display unit and an operation unit (not shown), a CPU 15 and the like.

  Next, the operation of this embodiment will be described with reference to FIG. The personal computer 4 communicates with the inverter device 5a via the operation panel 3 provided with the wireless communication unit 11, thereby reading and writing parameters set in the inverter devices 5a to 5d, and from the inverter devices 5a to 5d. Reading of monitor data, collection of communication data transmitted via the communication line 10 and the like are performed. The monitor data is data such as voltage, current, frequency, and torque.

  The wired communication network including the inverter devices 5a to 5d, the controller 6, the sensor unit 7, and the input / output terminal block 8 employs token passing access control. The wired communication units 9 and 9 a always receive communication data transmitted via the communication line 10.

  When the controller 6 obtains a transmission right (token), it transmits an operation command, a frequency command, and the like to the inverter devices 5a to 5d. When the inverter devices 5a to 5d acquire the transmission right, a response request is transmitted to the controller 6 and other inverter devices, and the connection state with these devices is confirmed based on the presence or absence of the response.

  The inverter device 5a acquires the transmission right by itself when the reception data of the wired communication unit 9b (that is, the reception data of the wireless communication unit 11 provided on the operation panel 3) is communication data for the inverter devices 5b to 5d. The gateway 13 is closed after waiting. Then, a parameter read request, a write request, or a monitor data read request for the inverter devices 5b to 5d transmitted from the personal computer 4 is transmitted to the inverter devices 5b to 5d. In response to the request, the inverter device 5 a receives the parameter, write completion response or monitor data transmitted from the inverter devices 5 b to 5 d and wirelessly transmits it to the personal computer 4 via the operation panel 3.

  On the other hand, when the received data of the wired communication unit 9b is communication data for itself, the inverter device 5a opens the gateway 13 and transmits response data to the personal computer 4 by wireless communication. Further, when the received data of the wired communication unit 9b is a request for collecting communication data transmitted via the communication line 10, the inverter device 5a closes the gateway 13 and the wired communication unit 9a receives the data. The communication data is transmitted to the personal computer 4.

  FIG. 2 shows an example of a sequence related to wired communication and wireless communication. For convenience of drawing, the communication sequence with the inverter device 5d, the sensor unit 7, and the input / output terminal block 8 is omitted. For the controller 6 and the inverter devices 5a to 5c, a period surrounded by a solid line is a period in which the transmission right is possessed. In the figure, PLC represents a controller 6, INV 1 to INV 3 represent inverter devices 5 a to 5 c, and PC represents a personal computer 4.

  When acquiring the transmission right, the controller 6 sequentially transmits an operation command and a frequency command to the inverter devices 5a to 5c and receives a response (period 1). When the inverter device 5a acquires the transmission right, the gateway 13 is opened when there is no data received from the personal computer 4. Then, response requests are sequentially transmitted to the controller 6 and the inverter devices 5b and 5c, and the responses are received (period 2).

  On the other hand, when the inverter device 5a receives a request for reading parameters and the like from the personal computer 4 during the period when the inverter device 5a has the transmission right, the inverter device 5a opens the gateway 13 and wirelessly communicates its own parameters and the like. To the personal computer 4. In addition, when the inverter device 5a receives a request for reading parameters, etc., from another device to the personal computer 4 during the period when the inverter device 5a has a transmission right, the inverter device 5a closes the gateway 13 and transmits the read request by wired communication. To do. When the inverter device 5a determines that the data received by wired communication is a parameter as response data, the inverter device 5a transmits it to the personal computer 4 by wireless communication.

  When the inverter devices 5b and 5c acquire the transmission right, the response requests are sequentially transmitted to the other inverter devices other than the controller 6 and itself, and the responses are received (periods 3 and 4).

  When the inverter device 5a receives the parameter read request of the inverter device 5b by wireless communication from the personal computer 4 during the period 4 in which the transmission right is not held, the read request is accumulated while the gateway 13 is opened. Thereafter, after the period 5 in which the controller 6 has the transmission authority, and when the inverter device 5a shifts to the period 6 in which the controller 6 has the transmission authority, the inverter device 5a closes the gateway 13 and reads the stored parameters for the inverter device 5b. Send the request via wired communication.

  When receiving the parameter transmitted from the inverter device 5b, the inverter device 5a transmits the parameter to the personal computer 4 by wireless communication. When the transmission of all the accumulated requests, reception of responses, and transmission of responses to the personal computer 4 are completed, the inverter device 5a opens the gateway 13 and transmits response requests to other devices in the same manner as in the period 2. Receive a response. The same applies to the subsequent sequences.

  According to the embodiment described above, the connection between the inverter device 5a and the personal computer 4 which is an external communication device is configured by wireless communication. This eliminates the electrical connection between the inverter 4a and the personal computer 4 having different potentials due to the presence of stray capacitance, etc., so that noise due to pulse current does not occur during connection for communication, and communication in a wired communication network. The occurrence of a failure can be prevented. As a result, even when manufacturing equipment driven by the inverter system 1 is in operation, the personal computer 4 can be used to perform parameter changing work and data monitoring work.

  The inverter device 5 a can exchange data between the wireless communication unit 11 and the wired communication unit 9 a via the operation panel 3 and the gateway 13. For this reason, the personal computer 4 can read and write parameters of the other inverter devices 5b to 5d connected to the communication line 10 and read monitor data through the specific inverter device 5a.

  This configuration is simpler than the configuration in which the personal computer 4 performs wireless communication with each of the inverter devices 5a to 5d individually, and wireless channel switching control is not required. Further, since the inverter device 5a is provided with a storage means for temporarily storing data received from the personal computer 4, a request received from the personal computer 4 during a period when the transmission right is not obtained is obtained. Can be sent to other devices.

  The personal computer 4 can monitor communication data on the communication line 10 via the gateway 13 in the inverter device 5a. Thereby, the failure diagnosis of the inverter system 1 can be easily performed without physically changing the transmission path (communication line 10).

  Since the wireless communication unit 11 is provided not on the main body of the inverter device in the control panel 2 but on the operation panel 3, radio communication radio waves outside the control panel 2 without opening the door of the control panel 2 that shields radio waves. Can be sent out.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. 3 and 4. The inverter system 21 shown in FIG. 3 does not include the controller 6, but instead the inverter device 5a controls the operation / stop of the inverter devices 5b to 5d. The wired communication network including the inverter devices 5a to 5d, the sensor unit 7, and the input / output terminal block 8 employs master / slave access control in which the inverter device 5a serves as a master and the other devices serve as slaves. Therefore, the transmission right is held by the inverter device 5a. Other configurations and control of the gateway 13 are the same as those of the inverter system 1 shown in FIG.

  FIG. 4 shows an example of a sequence related to wired communication and wireless communication. As in FIG. 2, the communication sequence with the inverter device 5d, the sensor unit 7 and the input / output terminal block 8 is omitted. The data passing through the gateway 13 for the inverter device 5a is also specified.

  The inverter device 5a broadcasts an operation command and a frequency command to the inverter devices 5b to 5c in order as necessary. Although omitted in FIG. 4, responses from the inverter devices 5 b to 5 c may be received.

  When the inverter device 5a receives a request for reading parameters and the like from the personal computer 4 to the inverter device 5a, the inverter device 5a opens the gateway 13 and transmits the parameters and the like to the personal computer 4 by wireless communication. When the inverter device 5a receives a read request for parameters, etc., from the personal computer 4 to the other device, the inverter device 5a closes the gateway 13 and transmits the read request by wired communication. When the inverter device 5a receives a parameter or the like transmitted from another device, the inverter device 5a transmits it to the personal computer 4 by wireless communication.

  When the received data from the personal computer 4 is a request for collecting communication data transmitted via the communication line 10, the inverter device 5a closes the gateway 13 and receives the communication data received by the wired communication unit 9a. Send to PC 4. According to this embodiment, the same effect as that of the first embodiment can be obtained.

(Third embodiment)
A third embodiment will be described with reference to FIG. The inverter devices 5a to 5d of the inverter system 31 are not arranged in the control panel, but are arranged in parallel in individual manufacturing facilities. For this reason, the operation panel 3 is not provided. Other configurations are the same as those of the inverter system 21 shown in FIG. Also according to this embodiment, the same operation and effect as the first and second embodiments can be obtained.

(Other embodiments)
In addition to the embodiment described above, the following configuration may be adopted.
In the second and third embodiments, token passing access control may be employed. The external communication device is not limited to a personal computer.

  The personal computer 4 may transmit a control signal to the inverter device 5a by wireless communication, and the inverter device 5a may transmit the received control signal to other devices such as the inverter devices 5b to 5d by wired communication. That is, the data communication between the personal computer 4 and the inverter device 5a includes communication of control signals (such as operation command signals and frequency command signals).

The personal computer 4 may transmit a request signal for the controller 6 to the inverter device 5a. That is, the controller 6 can be included in other devices referred to in the present invention.
In the first and second embodiments, not only a configuration in which the wireless communication unit 11 is connected to the operation panel 3 in advance, but also a configuration in which the wireless communication unit 11 is connected to the operation panel 3 when wireless communication is required. May be. Further, the wireless communication unit 11 may be detachably provided on the operation panel 3.

  In the third embodiment, not only a configuration in which the wireless communication unit 11 is connected to the inverter device 5a in advance, but also a configuration in which the wireless communication unit 11 is connected to the inverter device 5a when wireless communication is required. . Moreover, you may provide the radio | wireless communication unit 11 in the inverter apparatus 5a so that attachment or detachment is possible.

  The operation panel 3 may be provided so as to be removable from the inverter device 5a (inverter body). The operation panel 3 can be configured to be attachable directly or via a cable to the operation panel 3 or the inverter device 5a (inverter body).

According to the embodiment described above, it is possible to prevent troubles in wired communication at the time of connection with the external communication device, and to reduce the trouble of connection with the external communication device.
Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

  In the drawing, 3 is an operation panel, 4 is a personal computer (external communication device), 5a is an inverter device (inverter body), 9, 9a and 9b are wired communication units (wired communication means), 10 is a communication line, and 11 is wireless communication. A unit (wireless communication means), 13 is a gateway, and 12 is a CPU (control means).

Claims (6)

Wireless communication means for performing wireless data communication with an external communication device;
Wired communication means for performing wired data communication with other devices via a communication line;
Provided between the wireless communication means and the wired communication means, and in a closed state, the reception data of the wireless communication means is transmitted to the wired communication means and the reception data of the wired communication means is transmitted to the wireless communication means. And a gateway for blocking between the wireless communication unit and the wired communication unit in an open state;
Control that closes the gateway when the reception data of the wireless communication means is data for the other device, and opens the gateway when the reception data of the wireless communication means is data for the inverter device And an inverter device.   The control means receives communication data transmitted via the communication line with the wired communication means in a state where the gateway is closed, and transmits the communication data to the external communication device by the wireless communication means. The inverter device according to claim 1.   The control means is configured to be able to store received data of the wireless communication means, and controls the gateway to a closed state when the wired communication means has a transmission authority to the other device, The inverter apparatus according to claim 1, wherein the stored reception data is transmitted to the other device by the wired communication unit.   4. The control unit, when determining that the reception data of the wired communication unit is response data to the external communication device, transmits the response data to the external communication device by the wireless communication unit. The described inverter device. An inverter main body, an operation panel removable from the inverter main body or an operation panel attachable to the inverter main body directly or via a cable;
The inverter device according to any one of claims 1 to 4, wherein the wireless communication unit is provided on the operation panel.   6. The inverter apparatus according to claim 1, wherein the wireless communication unit is detachably provided.

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