WO2021005662A1 - Abnormality diagnosis system and abnormality diagnosis method - Google Patents

Abstract

An abnormality diagnosis system that comprises: an inverter (1-1) that includes a logic circuit (7-1) that controls an electrical circuit that converts power, a first output terminal from which signals are outputted, a first input terminal into which signals are inputted, and a communication terminal (8-1); and an inverter (1-2) that includes a logic circuit (7-2) that controls an electrical circuit that converts power, a second output terminal from which signals are outputted, a second input terminal into which signals are inputted, and a communication terminal (8-2) that is connected to communication terminal (8-1) for communication. Inverter (1-1) and inverter (1-2) are electrically connected to each other. In accordance with an output command that has been transmitted from logic circuit (7-1) via communication terminal (8-1) and communication terminal (8-2), logic circuit (7-2) outputs a signal from the second output terminal into the first input terminal. Logic circuit (7-1) compares the output command and the signal inputted into the first input terminal from the second output terminal and thereby diagnoses abnormality of the second output terminal or the first input terminal.

Description

Abnormality diagnosis system and abnormality diagnosis method

The present invention relates to an abnormality diagnosis system and an abnormality diagnosis method for diagnosing an abnormality of an inverter.

The inverter has terminals such as input terminals and output terminals, and these terminals are connected to external devices. If the terminal of the inverter malfunctions, it is necessary to stop and repair the inverter, which increases the downtime of the equipment. Therefore, it is desired to detect the malfunction of the terminal at an early stage.

The inverter described in Patent Document 1 inputs a pulse signal output from an output circuit to an input circuit, and has a pulse signal (command pulse) generated inside the inverter and a pulse signal (feedback pulse) input to the input circuit. When is inconsistent, it is determined that an abnormality has occurred in the input circuit.

Japanese Unexamined Patent Publication No. 2012-34463

However, in the technique of Patent Document 1, when diagnosing an inverter, it is necessary to individually connect the inverter to the pulse input circuit to operate the inverter and obtain the diagnosis result individually. Therefore, the pulse input circuit is used. Alternatively, it was necessary to reconnect the pulse input circuit for each inverter. Therefore, there is a demand for a system that can easily diagnose an inverter.

The present invention has been made in view of the above, and an object of the present invention is to obtain an abnormality diagnosis system capable of easily diagnosing an inverter.

In order to solve the above-mentioned problems and achieve the object, the abnormality diagnosis system of the present invention has a first control unit that controls an electric circuit that converts power, a first output terminal that outputs a signal, and a signal. A first input terminal for inputting data, a first inverter having a first communication unit, a second control unit for controlling an electric circuit for converting power, and a second output terminal for outputting a signal. , A second input terminal for inputting a signal, and a second inverter having a second communication unit communicatively connected to the first communication unit. The first inverter and the second inverter are electrically connected to each other, and the second control unit is transmitted from the first control unit via the first communication unit and the second communication unit. According to the output command, a signal is output from the second output terminal and input to the first input terminal, and the first control unit outputs the signal input from the second output terminal to the first input terminal. Compare with the command and diagnose the abnormality of the second output terminal or the first input terminal.

The abnormality diagnosis system according to the present invention has an effect that the inverter can be easily diagnosed.

The figure which shows the structure of the abnormality diagnosis system which concerns on Embodiment 1. A flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses a digital output terminal. A flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses a digital input terminal. A flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses an analog output terminal. A flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses an analog input terminal. A flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses deterioration of inverter parts. The figure which shows the structure of the abnormality diagnosis system which concerns on Embodiment 2. A flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the second embodiment diagnoses a digital output terminal. The figure which shows the hardware configuration example of the logic circuit which concerns on Embodiments 1 and 2. The figure which shows the hardware configuration example of the control device when the control device of the inverter which concerns on Embodiments 1 and 2 is composed of a processor and a memory.

The abnormality diagnosis system and the abnormality diagnosis method according to the embodiment of the present invention will be described in detail below with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a diagram showing a configuration of an abnormality diagnosis system according to the first embodiment. The abnormality diagnosis system includes two inverters (inverter devices) composed of electric circuits. In the present embodiment, a case where the abnormality diagnosis system includes an inverter 1-1 and an inverter 1-2 as inverters will be described. The abnormality diagnosis system diagnoses whether or not an abnormality has occurred in the inverters 1-1 and 1-2.

Inverter 1-1, which is the first inverter, is connected to switches 10-1, 11-1, 12-1, 13-1. Inverter 1-1 switches between connection (connection) to external device 20-1 and connection to inverter 1-2 by switching switches 10-1, 11-1, 12-1, and 13-1. Be done. When the inverter 1-1 is connected to the external device 20-1, the switches 10-1, 11-1, 12-1, 13-1 are connected to the external device 20-1. When the inverter 1-1 is connected to the inverter 1-2, the switches 10-1, 11-1, 12-1, 13-1 are connected to the inverter 1-2. In FIG. 1, a part of the connection line connecting the switches 11-1, 12-1, 13-1 and the external device 20-1 is not shown.

Inverter 1-2, which is the second inverter, is connected to switches 10-2, 11-2, 12-2, 13-2. In the inverter 1-2, the connection to the external device 20-2 and the connection to the inverter 1-1 are switched by switching the switches 10-2, 11-2, 12-2, and 13-2. When the inverter 1-2 is connected to the external device 20-2, the switches 10-2, 11-2, 12-2, 13-2 are connected to the external device 20-2. When the inverter 1-2 is connected to the inverter 1-1, the switches 10-2, 11-2, 12-2, 13-2 are connected to the inverter 1-1. That is, when the inverter 1-2 is connected to the inverter 1-1, the switch 10-1 and the switch 11-2 are connected, the switch 12-1 and the switch 13-2 are connected, and the switch 11- 1 and switch 10-2 are connected, and switch 13-1 and switch 12-2 are connected. In FIG. 1, a part of the connection line connecting the switches 10-2, 12-2, 13-2 and the external device 20-2 is not shown.

The external device 20-1 is a device such as a motor driven by the inverter 1-1, and the external device 20-2 is a device such as a motor driven by the inverter 1-2.

The inverter 1-1 includes an analog input terminal 2-1 and a digital input terminal 3-1, an analog output terminal 4-1 and a digital output terminal 5-1 and a fan 6-1 and a logic circuit 7-1. , Communication terminal 8-1 and memory 30-1 are provided.

Further, the inverter 1-2 includes an analog input terminal 2-2, a digital input terminal 3-2, an analog output terminal 4-2, a digital output terminal 5-2, a fan 6-2, and a logic circuit 7-. 2, a communication terminal 8-2, and a memory 30-2 are provided.

In the abnormality diagnosis system, the analog output terminal 4-1 or the digital output terminal 5-1 is the first output terminal, and the analog input terminal 2-1 or the digital input terminal 3-1 is the first input terminal. .. Further, the analog output terminal 4-2 or the digital output terminal 5-2 is the second output terminal, and the analog input terminal 2-2 or the digital input terminal 3-2 is the second input terminal. Further, the logic circuit 7-1 is the first control unit, and the logic circuit 7-2 is the second control unit. Further, the communication terminal 8-1 is the first communication unit, and the communication terminal 8-2 is the second communication unit.

Since the inverter 1-1 and the inverter 1-2 have the same configuration, the configuration of the inverter 1-1 will be described here. The logic circuit 7-1 is a control device that controls the operation of each component included in the inverter 1-1. The logic circuit 7-1 receives signals from the analog input terminal 2-1 and the digital input terminal 3-1. The logic circuit 7-1 transmits a signal to the analog output terminal 4-1 and the digital output terminal 5-1. Further, the logic circuit 7-1 transmits and receives a signal between the fan 6-1 and the communication terminal 8-1 and the memory 30-1. The logic circuit 7-1 transmits or receives a signal to and from each component in the inverter 1-1 based on the diagnostic information described later.

The analog input terminal 2-1 takes the DC voltage (DC 0V to 5V, etc.) or DC current (DC 4mA to 20mA, etc.) output by the external device 20-1 connected to the analog input terminal 2-1 to the inverter 1-1. It is a terminal to insert. The analog input terminal 2-1 can be connected to the external device 20-1 or the analog output terminal 4-2 via the switch 11-1. The analog input terminal 2-1 receives the analog signal output from the external device 20-1 or the analog output terminal 4-2 and inputs it to the logic circuit 7-1.

The digital input terminal 3-1 is a terminal that captures the short-circuited (on) or open (off) state of the external device 20-1 connected to the digital input terminal 3-1 into the inverter 1-1. The digital input terminal 3-1 can be connected to the external device 20-1 or the digital output terminal 5-2 via the switch 13-1. The digital input terminal 3-1 receives the digital signal output from the external device 20-1 or the digital output terminal 5-2 and inputs the digital signal to the logic circuit 7-1.

The analog output terminal 4-1 is a terminal that outputs a variable voltage (DC 0V to 10V, etc.). The analog output terminal 4-1 can be connected to the external device 20-1 or the analog input terminal 2-2 via the switch 10-1. The analog output terminal 4-1 outputs the analog signal generated by the logic circuit 7-1 to the external device 20-1 or the analog input terminal 2-2.

The digital output terminal 5-1 is a terminal that is on (if it is an open collector, the output transistor is conductive) or off (if it is an open collector, the output transistor is not conductive). The digital output terminal 5-1 can be connected to the external device 20-1 or the digital input terminal 3-2 via the switch 12-1. The digital output terminal 5-1 outputs the digital signal generated by the logic circuit 7-1 to the external device 20-1 or the digital input terminal 3-2.

Fan 6-1 is a cooling fan that cools the inverter 1-1. The fan 6-1 operates according to the instruction from the logic circuit 7-1. The fan 6-1 includes a sensor (not shown) that detects the rotation speed, and sends the detected rotation speed to the logic circuit 7-1. The memory 30-1 stores diagnostic information used by the logic circuit 7-1 during the diagnostic process. In the diagnostic information, the output value of the signal and the like are specified.

For example, in the diagnostic information, when diagnosing the digital output terminal, the diagnostic master device sends a digital output command to the diagnostic slave device, and the digital output command turns the output of the digital output terminal of the slave device from off to on. It is stipulated that it is a command to change to. The diagnostic master device is an inverter that commands the diagnosis, and the diagnostic slave device is the inverter that commands the diagnosis. Further, the diagnostic information stipulates that the output of the digital output terminal provided in the master device should be changed from off to on when diagnosing the digital input terminal.

The diagnostic information includes that the master device sends an analog output command to the slave device when diagnosing the analog output terminal, and the analog output command is a command to change the output of the analog output terminal from 0 to the maximum voltage. Things are stipulated. Further, the diagnostic information stipulates that when diagnosing the analog input terminal, the output of the analog output terminal provided in the master device is changed from 0 to the maximum voltage.

Further, the memory 30-1 stores the diagnosis result (judgment result) by the inverter 1-1 and the diagnosis result by the inverter 1-2. That is, in the abnormality diagnosis system, each inverter stores the diagnosis result diagnosed in the abnormality diagnosis system. As a result, in the abnormality diagnosis system, each inverter shares the diagnosis result.

The communication terminal 8-1 of the inverter 1-1 is connected to the communication terminal 8-2 of the inverter 1-2. The communication terminal 8-1 communicates with the communication terminal 8-2 according to the instruction from the logic circuit 7-1.

The inverter 1-1 has an analog input terminal 2-1, a digital input terminal 3-1 and an analog output terminal 4-1 and a digital output terminal 5 during normal operation for driving an external device 20-1 such as a motor. -1 is connected to the external device 20-1.

Similarly, in the normal operation of driving the external device 20-2 such as a motor, the inverter 1-2 has an analog input terminal 2-2, a digital input terminal 3-2, an analog output terminal 4-2, and a digital. The output terminal 5-2 is connected to the external device 20-2.

When the abnormality diagnosis system diagnoses the inverter 1-1 or the inverter 1-2, the switches 10-1, 11-1, 12-1, 13-1, 10-2, 11-2, 12-2. , 13-2 are switched. As a result, the inverter 1-1 and the inverter 1-2 are connected. Specifically, the analog output terminal 4-1 and the analog input terminal 2-2 are connected, and the analog output terminal 4-2 and the analog input terminal 2-1 are connected. Further, the digital output terminal 5-1 and the digital input terminal 3-2 are connected, and the digital output terminal 5-2 and the digital input terminal 3-1 are connected.

In the abnormality diagnosis system, the communication terminal 8-1 of the inverter 1-1 and the communication terminal 8-2 of the inverter 1-2 are connected by a cable, whereby a plurality of inverters are connected via the cable. There is. In the abnormality diagnosis system, one of the inverters 1-1 and 1-2 becomes the master device for the diagnosis process, and the other one becomes the slave device for the diagnosis process.

Here, the case where the inverter 1-1 becomes the master device and the inverter 1-2 becomes the slave device will be described. The inverter 1-1, which is the master device for diagnostic processing, is manually operated by the user so as to be the master device. For example, when the user inputs an instruction to become the master device to the inverter 1-1, the inverter 1-1 becomes the master device. When the inverter 1-1 is set in the master device, it enters the diagnostic mode. In the diagnostic mode, the inverter 1-1 performs a diagnostic operation instead of a normal operation (motor operation or the like) and does not drive the external device 20-1.

For the inverters 1-1 and 1-2, set the communication settings and the unique station code so that the inverters 1-1 and 1-2 can communicate with each other. The communication setting and the area code setting for the inverter 1-1 are performed by the user. The communication setting and the station code setting for the inverter 1-2 may be performed by the user or may be performed by the inverter 1-1 which is the master device.

After the inverters 1-1 and 1-2 are connected, the diagnosis of the inverter 1-2 is started. Here, a processing procedure when the abnormality diagnosis system diagnoses the inverter 1-2 will be described.

When the abnormality diagnosis system starts the diagnosis of the inverter 1-2, the inverter 1-1 sends a diagnosis start command to the inverter 1-2. When the inverter 1-2 receives the diagnosis start command, the inverter 1-2 enters the diagnosis mode of the slave device. In the diagnostic mode, the inverter 1-2 performs the diagnostic operation instead of the normal motor operation, and does not drive the motor.

FIG. 2 is a flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses a digital output terminal. FIG. 2 describes a processing procedure when the abnormality diagnosis system diagnoses the digital output terminal 5-2 of the inverter 1-2.

After the inverters 1-1 and 1-2 are in the diagnostic mode, the inverter 1-1 transmits a digital output command to the inverter 1-2 (step S10). The digital output command is a command to change the output of the digital output terminal from off to on.

When the inverter 1-2 receives the digital output command, the inverter 1-2 changes the output of the digital output terminal 5-2 from off to on (step S20). As a result, the signal input from the digital output terminal 5-2 to the digital input terminal 3-1 of the inverter 1-1 changes from off to on.

Inverter 1-1 analyzes the signal input to the digital input terminal 3-1 (step S30). The inverter 1-1 determines whether or not the change in the signal input to the digital input terminal 3-1 is the change intended by the inverter 1-1 (step S40). Specifically, it is determined whether or not the signal input to the digital input terminal 3-1 has changed from off to on. The logic circuit 7-1 may use a digital output command for analyzing the signal input to the digital input terminal 3-1. In this case, the logic circuit 7-1 determines whether or not the signal input to the digital input terminal 3-1 and the signal specified by the digital output command are the same.

Here, the logic circuit 7-1 executes the determination of the signal input to the digital input terminal 3-1. In the flowchart of FIG. 2 described above, the “digital output command” in step S10 is a command for changing the digital output terminal 5-2 by communication from the inverter 1-1 to the inverter 1-2 from off to on. Here, the inverter 1-2 that receives the command changes the digital output terminal 5-2 from off (initial state) to on. The digital input terminal 3-1 of the inverter 1-1 captures the change from off to on of the digital output terminal 5-2. That is, the logic circuit 7-1 of the inverter 1-1 changes the digital output terminal 5-2 from off to on by a communication command, and the change signal is input to the digital input terminal 3-1. At this time, although the logic circuit 7-1 issues a command to switch from off to on to the digital output terminal 5-2 in step S10, the digital output terminal 5-2 remains off (that is, the digital input terminal). If the signal of 3-1 remains off), the logic circuit 7-1 determines that it is abnormal.

When the change in the signal input to the digital input terminal 3-1 is the change intended by the inverter 1-1 (step S40, Yes), the inverter 1-1 is the digital output terminal 5-2 of the inverter 1-2. It is determined that the operation of is normal (step S50). The inverter 1-1 may determine that the operation of the digital input terminal 3-1 of the inverter 1-1 is normal, or the operation of the digital output terminal 5-2 and the operation of the digital input terminal 3-1. May be determined to be normal.

On the other hand, when the change in the signal input to the digital input terminal 3-1 is not the change intended by the inverter 1-1 (step S40, No), the inverter 1-1 has the digital output terminal 5-2 and the digital input terminal. It is determined that the operation of any of the terminals in 3-1 is abnormal (step S60).

After step S50 or step S60, the inverter 1-1 stores the diagnosis result (determination result) in the memory 30-1 (step S70). Inverter 1-1 transmits a diagnosis end command to inverter 1-2 (step S80). As a result, the inverter 1-2 changes the output of the digital output terminal 5-2 from on to off.

Inverter 1-1 transmits the diagnosis result to inverter 1-2 (step S90), and ends the diagnosis process. The inverter 1-2 stores the diagnosis result in the memory 30-2 (step S100). As a result, the inverter 1-2 ends the diagnostic process. Either of the processes of step S80 and step S90 may be executed first.

FIG. 3 is a flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses a digital input terminal. FIG. 3 describes a processing procedure when the abnormality diagnosis system diagnoses the digital input terminal 3-2 of the inverter 1-2.

After the inverters 1-1 and 1-2 are in the diagnostic mode, the inverter 1-1 changes the output of the digital output terminal 5-1 from off to on (step S110).

After entering the diagnostic mode, the inverter 1-2 autonomously analyzes the signal input to the digital input terminal 3-2 (step S120). That is, the inverter 1-2 diagnoses the inverter 1-2 after the diagnosis mode is entered, without requiring any operation from the user. The inverter 1-1 may notify the inverter 1-2 via the communication terminals 8-1 and 8-2 that the digital output terminal 5-1 is changed from off to on. In this case, the inverter 1-2 analyzes the signal input to the digital input terminal 3-2 after receiving the notification from the inverter 1-1.

The inverter 1-2 determines whether or not the change in the signal input to the digital input terminal 3-2 is the change intended by the inverter 1-1 (step S130). Specifically, the logic circuit 7-2 determines whether or not the signal input to the digital input terminal 3-2 has changed from off to on.

The logic circuit 7-2 executes the determination in step S130. In the flowchart of FIG. 3, when the digital output terminal 5-1 is changed from off to on by the control of the logic circuit 7-1 of the inverter 1-1 in step S110, the digital input terminal 3-2 of the inverter 1-2 is changed. The change is taken in and the change in the signal state is transmitted to the logic circuit 7-2. The logic circuit 7-2 determines that the digital output terminal 5-1 and the digital input terminal 3-2 are operating normally based on the change in the signal state of the digital input terminal 3-2. In the logic circuit 7-2, if the digital output terminal 5-1 is turned from off to on but the digital input terminal 3-2 is not turned from off to on, the digital output terminal 5-1 and the digital input terminal 3 At least one of -2 is judged to be abnormal.

Note that the determination in step S130 may be executed by the logic circuit 7-1. In this case, in the flowchart of FIG. 3, when the digital output terminal 5-1 is changed from off to on by the control of the logic circuit 7-1 of the inverter 1-1 in step S110, the digital input terminal 3 of the inverter 1-2 -2 captures the change, and the logic circuit 7-2 transmits the change in the signal state of the digital input terminal 3-2 to the logic circuit 7-1 via the communication terminal 8-2 and the communication terminal 8-1. When the logic circuit 7-1 is notified that the digital input terminal 3-2 has changed from off to on, that is, the logic circuit 7-1 has changed the output of the digital output terminal 5-1 to the digital input terminal 3-2. Upon recognizing that the input has been input, the logic circuit 7-1 compares the change in the signal state of the digital input terminal 3-2 with the control command of the logic circuit 7-1 in step S110, and compares the digital output terminal 5-1 and the digital input. It is determined that terminal 3-2 is operating normally. The logic circuit 7-1 is digital if the digital input terminal 3-2 has changed from off to on does not enter the communication terminal 8-1 even though the digital output terminal 5-1 is turned from off to on. At least one of the output terminal 5-1 and the digital input terminal 3-2 is determined to be abnormal.

When the change in the signal input to the digital input terminal 3-2 is the change intended by the inverter 1-1 (step S130, Yes), the inverter 1-2 is the digital input terminal 3-2 of the inverter 1-2. It is determined that the operation of is normal (step S140). The inverter 1-2 may determine that the operation of the digital output terminal 5-1 of the inverter 1-1 is normal, or the operation of the digital input terminal 3-2 and the operation of the digital output terminal 5-1. May be determined to be normal.

On the other hand, if the change in the signal input to the digital input terminal 3-2 is not the change intended by the inverter 1-1 (step S130, No), the inverter 1-2 has the digital input terminal 3-2 and the digital output terminal. It is determined that the operation of any of the terminals in 5-1 is abnormal (step S150).

After step S140 or step S150, the inverter 1-2 stores the diagnosis result in the memory 30-2 (step S160). Inverter 1-2 transmits the diagnosis result to inverter 1-1 (step S170). The inverter 1-1 stores the diagnosis result in the memory 30-1 (step S180).

Inverter 1-1 transmits a diagnosis end command to inverter 1-2 (step S190). As a result, the inverter 1-2 ends the diagnostic process. The inverter 1-1 changes the output of the digital output terminal 5-1 from on to off, whereby the inverter 1-1 ends the diagnostic process.

FIG. 4 is a flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses an analog output terminal. FIG. 4 describes a processing procedure when the abnormality diagnosis system diagnoses the analog output terminal 4-2 of the inverter 1-2.

After the inverters 1-1 and 1-2 are in the diagnostic mode, the inverter 1-1 transmits an analog output command to the inverter 1-2 (step S210). The analog output command is a command to change the output of the analog output terminal from 0 to the maximum voltage.

When the inverter 1-2 receives the analog output command, the inverter 1-2 changes the output of the analog output terminal 4-2 from 0 to the maximum voltage (step S220). That is, when the inverter 1-2 receives the analog output command, it changes from DC (direct current) 0V to a maximum voltage such as DC10V. As a result, the signal input from the analog output terminal 4-2 to the analog input terminal 2-1 of the inverter 1-1 changes from 0 to the maximum voltage.

The inverter 1-1 analyzes the signal input to the analog input terminal 2-1 (step S230). The inverter 1-1 determines whether or not the change in the signal input to the analog input terminal 2-1 is the change intended by the inverter 1-1 (step S240). Specifically, the logic circuit 7-1 determines whether or not the signal input to the analog input terminal 2-1 has changed from 0 to the maximum voltage. The logic circuit 7-1 may use an analog output command for analyzing the signal input to the analog input terminal 2-1. In this case, the logic circuit 7-1 determines whether or not the signal input to the analog input terminal 2-1 and the signal specified by the analog output command are the same.

When the change in the signal input to the analog input terminal 2-1 is the change intended by the inverter 1-1 (step S240, Yes), the inverter 1-1 is the analog output terminal 4-2 of the inverter 1-2. It is determined that the operation of is normal (step S250). The inverter 1-1 may determine that the operation of the analog input terminal 2-1 of the inverter 1-1 is normal, or the operation of the analog output terminal 4-2 and the operation of the analog input terminal 2-1. May be determined to be normal.

On the other hand, if the change in the signal input to the analog input terminal 2-1 is not the change intended by the inverter 1-1 (step S240, No), the inverter 1-1 has the analog output terminal 4-2 and the analog input terminal. It is determined that the operation of any of the terminals of 2-1 is abnormal (step S260).

After step S250 or step S260, the inverter 1-1 stores the diagnosis result (determination result) in the memory 30-1 (step S270). Inverter 1-1 transmits a diagnosis end command to inverter 1-2 (step S280). As a result, the inverter 1-2 changes the output of the analog output terminal 4-2 from the maximum voltage to 0.

Inverter 1-1 transmits the diagnosis result to inverter 1-2 (step S290), and ends the diagnosis process. The inverter 1-2 stores the diagnosis result in the memory 30-2 (step S300). As a result, the inverter 1-2 ends the diagnostic process. Either of the processes of step S280 and step S290 may be executed first.

FIG. 5 is a flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses an analog input terminal. FIG. 5 describes a processing procedure when the abnormality diagnosis system diagnoses the analog input terminal 2-2 of the inverter 1-2.

After the inverters 1-1 and 1-2 are in the diagnostic mode, the inverter 1-1 changes the output of the analog output terminal 4-1 from 0 to the maximum voltage (step S310).

Inverter 1-2 analyzes the signal input to analog input terminal 2-2 after entering the diagnostic mode (step S320). That is, the inverter 1-2 diagnoses the inverter 1-2 after the diagnosis mode is entered, without requiring any operation from the user.

The inverter 1-2 determines whether or not the change in the signal input to the analog input terminal 2-2 is the change intended by the inverter 1-1 (step S330). Specifically, the logic circuit 7-2 determines whether or not the signal input to the analog input terminal 2-2 has changed from 0 to the maximum voltage.

When the change in the signal input to the analog input terminal 2-2 is the change intended by the inverter 1-1 (step S330, Yes), the inverter 1-2 is the analog input terminal 2-2 of the inverter 1-2. It is determined that the operation of is normal (step S340). The inverter 1-2 may determine that the operation of the analog output terminal 4-1 of the inverter 1-1 is normal, or the operation of the analog input terminal 2-2 and the operation of the analog output terminal 4-1. May be determined to be normal.

On the other hand, if the change in the signal input to the analog input terminal 2-2 is not the change intended by the inverter 1-1 (step S330, No), the inverter 1-2 has the analog input terminal 2-2 and the analog output terminal. It is determined that the operation of any of the terminals in 4-1 is abnormal (step S350).

After step S340 or step S350, the inverter 1-2 stores the diagnosis result in the memory 30-2 (step S360). Inverter 1-2 transmits the diagnosis result to inverter 1-1 (step S370). The inverter 1-1 stores the diagnosis result in the memory 30-1 (step S380).

Inverter 1-1 transmits a diagnosis end command to inverter 1-2 (step S390). As a result, the inverter 1-2 ends the diagnostic process. The inverter 1-1 changes the output of the analog output terminal 4-1 from the maximum voltage to 0, whereby the inverter 1-1 ends the diagnostic process.

In the first embodiment, the result of determination for the operation of the analog input terminal 2-2 or the digital input terminal 3-2 is the first input determination result, and the analog output terminal 4-1 or the digital output terminal 5-1 The result of the determination for the operation is the first output determination result.

FIG. 6 is a flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the first embodiment diagnoses deterioration of inverter parts. FIG. 6 describes a processing procedure when the abnormality diagnosis system diagnoses deterioration of parts of the inverter 1-2.

After the inverters 1-1 and 1-2 are in the diagnostic mode, the inverter 1-1 transmits a component diagnostic command to the inverter 1-2 (step S410). The parts diagnosis command is a command for diagnosing the deterioration of specific parts (lifetime parts) included in the inverter 1-2.

When the inverter 1-2 receives the component diagnosis command, the inverter 1-2 diagnoses the deterioration of the component by the life diagnosis function (step S420). For example, when the bearing of the fan 6-2 deteriorates, the rotation speed of the fan 6-2 becomes slower than the rated rotation angle according to the deterioration. Therefore, the inverter 1-2 measures the current rotation speed of the fan 6-2 when the diagnosis of the fan 6-2 is specified by the component diagnosis command. Then, the logic circuit 7-2 calculates the ratio between the current rotation speed of the fan 6-2 and the rated rotation speed, and uses the calculation result as the diagnosis result of deterioration of the fan 6-2. The inverter 1-2 stores the calculated diagnosis result in the memory 30-2 (step S430).

Further, the inverter 1-2 transmits the diagnosis result to the inverter 1-1 (step S440), and ends the diagnosis process. The inverter 1-1 stores the diagnosis result in the memory 30-1 (step S450), and ends the diagnosis process.

Inverter 1-1 may send a diagnosis start command to inverter 1-2 after completing the diagnosis process as a master device. In this case, the inverter 1-2 becomes the master device and the inverter 1-1 becomes the slave device, and the diagnostic processing of the inverter 1-1 is performed. The diagnostic process of the inverter 1-1 is the same as the diagnostic process of the inverter 1-2 described with reference to FIGS. 2 to 6.

Note that the diagnosis result may be transmitted from the inverter 1-1 to the inverter 1-2 after all the diagnoses described in FIGS. 2 to 6 are completed. Further, the transmission of the diagnosis result from the inverter 1-2 to the inverter 1-1 may be performed after all the same diagnosis as the processing described with reference to FIGS. 2 to 6 is completed.

As described above, the inverters 1-1 and 1-2 transmit and receive the diagnostic results to and from each other, so that both the inverters 1-1 and the inverters 1-2 hold the diagnostic results of the inverters 1-1 and 1-2. be able to.

By the way, when diagnosing the operation of the input terminal, the operation of the output terminal, or the parts of the inverter, if equipment such as a measuring instrument that can observe the waveform of the signal input / output to the inverter in detail is used, the diagnosis is expensive. It takes.

In addition, detailed product knowledge (knowledge for operating the inverter) is required when observing the operation by arbitrarily operating the output terminal or input terminal. For example, as a method of checking the operation of the digital output terminal, there is a method of observing the voltage waveform (operation) with a measuring instrument by operating the inverter so that the digital output terminal is turned from off to on or from on to off. If the operation at this time and the operation match, it can be confirmed that the digital output terminal is operating normally. To use this method, product knowledge is required to turn the output terminal to be diagnosed from off to on or from on to off. Further, since some inverters have a plurality of digital output terminals, it is necessary to check the number of digital output terminals.

Also, among the digital output terminals, there is a terminal that outputs analog values with pulse density. As a method of confirming the operation of the digital output terminal that performs such pulse output, there is a method of observing the pulse output with a pulse measuring instrument by operating the inverter so that the pulse output increases or decreases. If the pulse output operation corresponding to the operation at this time can be observed with the pulse measuring instrument, it can be confirmed that the digital output terminal that outputs the pulse is operating normally. To use this method, product knowledge is required to perform an operation to increase or decrease the pulse output from the digital output terminal to be diagnosed as intended. Further, depending on the inverter, since there are a plurality of digital output terminals that perform pulse output, it is necessary to check the number of digital output terminals that perform pulse output.

Also, as a method of checking the operation of the analog output terminal, there is a method of observing the output voltage with a voltage measuring instrument by operating the inverter so that the analog output voltage increases or decreases. If the voltage output operation corresponding to the operation at this time can be observed with the measuring instrument, it can be confirmed that the analog output terminal is operating normally. To use this method, product knowledge is required to perform an operation to increase or decrease the output voltage of the analog output terminal to be diagnosed as intended. Further, since some inverters have a plurality of analog output terminals, confirmation work is required for the number of analog output terminals.

In addition, as a method of checking the operation of the digital input terminal, there is a method of checking the intake state by the inverter by performing a short circuit or opening operation with an external device connected to the digital input terminal. The capture status of the inverter by the digital input terminal can be confirmed from the operation panel or the application of the computer for the inverter, but it is necessary to prepare the operation panel or the application. In addition, it is necessary to know the operation method for displaying the capture status by the digital input terminal on the operation panel or the application. Further, depending on the inverter, since there are a plurality of digital input terminals, confirmation work is required for the number of digital input terminals.

In addition, as a method of checking the operation of the analog input terminal, there is a method of operating the output of DC voltage or DC current with an external device connected to the analog input terminal and checking the intake state by the inverter. In this case as well, an operation panel, an application, an operation method for displaying the import status, and the like are required. Further, depending on the inverter, since there are a plurality of analog input terminals, confirmation work is required for the number of analog input terminals.

There is also a method in which two terminals having the same function are arranged in the inverter, the operations of these two terminals are compared, and if they match, it is judged as normal, and if they do not match, it is judged as abnormal. This method requires twice as many terminals, which leads to an increase in the cost of the inverter.

In addition, the inverter has a life-long component (specific component). For example, a cooling fan that generates heat when an electric current flows is one of the components with a limited life. That is, the bearing of the cooling fan is a life-long component whose life is shortened due to heat generation. Among the inverters, there is an inverter that notifies the user of life information, which is life information, when the bearing of the cooling fan approaches the life. If only the inverter itself that has determined the life is holding the diagnosis result such as the life information, even if the inverter is connected to the network, other stations (other inverters, etc.) cannot grasp it. Therefore, if each inverter does not hold the diagnostic results of other inverters, the user can access the diagnostic results of other inverters connected to the network even if he / she accesses any one inverter. I couldn't get it. Therefore, in the case of product operation in which an alarm is output for the first time when the deterioration of the life-long component progresses, the user cannot know the deterioration state until the deterioration progresses.

In the abnormality diagnosis system of the present embodiment, the inverters 1-1 and 1-2 transmit and receive the diagnosis results to and from each other, so that both the inverters 1-1 and the inverters 1-2 are the inverters 1-1 and 1-2. The diagnosis result of the inverter can be retained. Therefore, the user can easily acquire the diagnosis results of the inverters 1-1 and 1-2 at any timing.

Further, in the abnormality diagnosis system of the present embodiment, digital input terminals 3-1 and 3-2, digital output terminals 5-1 and 5-2, and analog input terminals 2-1 and 2-2 are periodically diagnosed. , And since the abnormality of the analog output terminals 4-1 and 4-2 can be grasped, it is possible to replace the parts and the like before the inverter 1-1, 1-2 or the abnormality diagnosis system causes the abnormality. As a result, it is possible to avoid a system down due to an abnormality in the abnormality diagnosis system. In addition, if the diagnosis is performed when the abnormality diagnosis system is abnormal, the abnormal part can be limited, which leads to a reduction in downtime.

Further, in the abnormality diagnosis system of the present embodiment, it is possible to diagnose the slave device by using the terminals of the master device without arranging two terminals having the same function.

As described above, in the first embodiment, when the signal input to the input terminal of the inverter 1-2 of the inverter 1-2 is a signal corresponding to the signal output from the output terminal of the inverter 1-1. , It is determined that the operation of the input terminal of the inverter 1-2 is normal, and the diagnosis result, which is the determination result, is transmitted to the inverter 1-1. Then, the diagnosis results are stored in the inverters 1-1 and 1-2. Further, when the signal input to the input terminal of the inverter 1-1 of the inverter 1-1 is a signal corresponding to the signal output from the output terminal of the inverter 1-2, the output terminal of the inverter 1-2 Is determined to be normal, and the diagnosis result is transmitted to the inverter 1-2. Then, the diagnosis results are stored in the inverters 1-1 and 1-2. Therefore, the abnormality diagnosis system can easily manage the diagnosis results for a plurality of inverters.

Embodiment 2.
Next, a second embodiment of the present invention will be described with reference to FIGS. 7 and 8. In the second embodiment, the abnormality diagnosis system includes three or more inverters.

FIG. 7 is a diagram showing the configuration of the abnormality diagnosis system according to the second embodiment. Of the components of FIG. 7, components that achieve the same functions as the abnormality diagnosis system of the first embodiment shown in FIG. 1 are designated by the same reference numerals, and redundant description will be omitted.

The abnormality diagnosis system is equipped with n (n is a natural number of 3 or more) inverters. In the following, a case where n = 3 will be described for ease of explanation, but n may be 4 or more. When n = 3, the inverter 1-2 is the (n-1) th inverter.

The inverter 1-n, which is the nth inverter, has an analog input terminal 2-n, a digital input terminal 3-n, an analog output terminal 4-n, and a digital output terminal 5-n, similarly to the inverter 1-1. , A fan 6-n, a logic circuit 7-n, a communication terminal 8-n, and a memory 30-n. Since each component of the inverter 1-n has the same configuration as each component of the inverters 1-1 and 1-2, the description thereof will be omitted.

In the abnormality diagnosis system, at the time of diagnosis, the inverter 1-1 is connected to the inverter 1-2, the inverter 1-2 is connected to the inverter 1-n, and the inverter 1-n is connected to the inverter 1-1. That is, the inverters 1-1 to 1-n are connected in a loop in the order of inverter 1-1, inverter 1-2, ... Inverter 1-n. When n = 3, the inverter 1-2 is the (n-1) th inverter.

Inverter 1-1 can be switched between connection to external device 20-1 and connection to inverter 1-2 by switching switches 10-1 and 12-1. Further, the inverter 1-1 can be switched between the connection to the external device 20-1 and the connection to the inverter 1-n by switching the switches 11-1 and 13-1.

Inverter 1-2 can be switched between connection to external device 20-2 and connection to inverter 1-n by switching switches 10-2 and 12-2. Further, the inverter 1-2 can be switched between the connection to the external device 20-2 and the connection to the inverter 1-1 by switching the switches 11-2 and 13-2.

Inverter 1-n is connected to switches 10-n, 11-n, 12-n, 13-n. In the inverter 1-n, the connection to the external device 20-n and the connection to the inverter 1-1 are switched by switching the switches 10-n and 12-n. Further, in the inverter 1-n, the connection to the external device 20-n and the connection to the inverter 1-2 are switched by switching the switches 11-n and 13-n. In FIG. 7, a part of the connection line connecting the switches 10-n, 12-n, 13-n and the external device 20-n is not shown. The external device 20-n is a device such as a motor driven by the inverter 1-n.

The inverter 1-n is connected to the external device 20-n during the normal operation of driving the motor. In this case, the switches 10-n, 11-n, 12-n, 13-n are connected to the external device 20-n. As a result, the analog input terminal 2-n, the digital input terminal 3-n, the analog output terminal 4-n, and the digital output terminal 5-n are connected to the external device 20-n.

In addition, at the time of diagnosis, the inverter 1-n is connected to the inverter 1-2. In this case, the switch 11-n is connected to the inverter 1-2 via the switch 10-2, and the switch 13-n is connected to the inverter 1-2 via the switch 12-2. As a result, the analog input terminal 2-n is connected to the analog output terminal 4-2, and the digital input terminal 3-n is connected to the digital output terminal 5-2.

In addition, at the time of diagnosis, the inverter 1-n is connected to the inverter 1-1. In this case, the switch 10-n is connected to the inverter 1-1 via the switch 11-1, and the switch 12-n is connected to the inverter 1-1 via the switch 13-1. As a result, the analog output terminal 4-n is connected to the analog input terminal 2-1 and the digital output terminal 5-n is connected to the digital input terminal 3-1.

In the abnormality diagnosis system of the second embodiment, the analog output terminal 4-n or the digital output terminal 5-n is the nth (third) output terminal, and the analog input terminal 2-n or the digital input terminal 3-n. Is the nth input terminal. Further, the logic circuit 7-n is the nth control unit, and the communication terminal 8-n is the nth communication unit.

In the abnormality diagnosis system, the communication terminal 8-1 of the inverter 1-1, the communication terminal 8-2 of the inverter 1-2, and the communication terminal 8-n of the inverter 1-n are connected by a cable. , Multiple inverters are connected via cables. In the abnormality diagnosis system, one of the inverters 1-1, 1-2, 1-n becomes the master device for diagnostic processing, one of the remaining inverters becomes the first slave device, and the remaining inverter becomes the first slave device. It becomes the slave device of 2. That is, at the time of diagnosis, the master device, the first slave device to be diagnosed, and the second slave device are set for the inverters 1-1, 1-2, 1-n.

When diagnosing the digital output terminal or analog output terminal of the first slave device, the master device transmits an analog output command or a digital output command to the first slave device. When a signal is input from the first slave device in the diagnostic mode, the second slave device diagnoses the digital output terminal or the analog output terminal of the first slave device based on the input signal. ..

When diagnosing the digital input terminal or the analog input terminal of the first slave device, the master device outputs a diagnostic signal similar to that of the first embodiment to the first slave device. The diagnostic signal is the on-signal or maximum voltage described in Embodiment 1. When a signal is input from the master device in the diagnostic mode, the first slave device diagnoses the digital input terminal or the analog input terminal of the first slave device based on the input signal.

As described above, in the present embodiment, the diagnosis of the first slave device is executed by the master device, the first slave device, and the second slave device. That is, the master device of the present embodiment outputs a signal or a command, and the first slave device or the second slave device receives the signal to diagnose the first slave device.

In the following, a case where the inverter 1-1 becomes the master device, the inverter 1-2 becomes the first slave device to be diagnosed, and the inverter 1-n becomes the second slave device will be described.

The user manually operates the inverter 1-1, which is the master device for diagnostic processing, so that it becomes the master device.

Further, for the inverters 1-1, 1-2, 1-n, the communication setting and the unique station code are set so that the inverters 1-1, 1-2 can communicate with each other. .. The communication setting and the area code setting for the inverter 1-1 are performed by the user. The communication setting and the station code setting for the inverters 1-2 and 1-n may be performed by the user or may be performed by the inverter 1-1 which is the master device.

After the inverters 1-1, 1-2, 1-n are connected, the diagnosis of the inverter 1-2 is started. When the abnormality diagnosis system starts the diagnosis of the inverter 1-2, the inverter 1-1 sends the first diagnosis start command to the inverter 1-2 and the second diagnosis start command to the inverter 1-2n. The first diagnosis start command is a diagnosis start command for the first slave device, and the second diagnosis start command is a diagnosis start command for the second slave device. Therefore, the inverter 1-2 recognizes that the own device is the first slave device by receiving the first diagnosis start command. Further, the inverter 1-n recognizes that the own device is the second slave device by receiving the second diagnosis start command.

Inverter 1-2 goes into diagnostic mode when it receives the first diagnostic start command, and inverter 1-2 goes into diagnostic mode when it receives the second diagnostic start command.

Next, the processing procedure of the diagnostic processing by the abnormality diagnosis system will be described. Of the diagnostic processes by the abnormality diagnosis system according to the second embodiment, the same processes as the diagnostic processes by the abnormality diagnosis system according to the first embodiment will be omitted.

FIG. 8 is a flowchart showing a diagnostic processing procedure when the abnormality diagnosis system according to the second embodiment diagnoses a digital output terminal. FIG. 8 describes a processing procedure when the abnormality diagnosis system diagnoses the digital output terminal 5-2 of the inverter 1-2.

After the inverters 1-1, 1-2, 1-n are in the diagnostic mode, the inverter 1-1 transmits a digital output command to the inverter 1-2 (step S510). Inverters other than inverters 1-1 and 1-2 in the abnormality diagnosis system do not execute signal output processing even if they receive a digital output command because they are not commands to their own device.

When the inverter 1-2 receives the digital output command, the inverter 1-2 changes the output of the digital output terminal 5-2 from off to on (step S520). As a result, the signal input from the digital output terminal 5-2 to the digital input terminal 3-n of the inverter 1-n changes from off to on.

Inverter 1-n analyzes the signal input to the digital input terminal 3-n (step S530). The inverter 1-n determines whether or not the change in the signal input to the digital input terminal 3-n is the change intended by the inverter 1-1 (step S540). For example, the logic circuit 7-n determines whether or not the signal input to the digital input terminal 3-n has changed from off to on.

When the change in the signal input to the digital input terminal 3-n is the change intended by the inverter 1-1 (step S540, Yes), the inverter 1-n is the digital output terminal 5-2 of the inverter 1-2. It is determined that the operation of is normal (step S550). The inverter 1-n may determine that the operation of the digital input terminal 3-n of the inverter 1-n is normal, or the operation of the digital output terminal 5-2 and the operation of the digital input terminal 3-n. May be determined to be normal.

On the other hand, if the change in the signal input to the digital input terminal 3-n is not the change intended by the inverter 1-1 (step S540, No), the inverter 1-n has the digital output terminal 5-2 and the digital input terminal. It is determined that the operation of any of the terminals of 3-n is abnormal (step S560).

After step S550 or step S560, the inverter 1-n stores the diagnosis result in the memory 30-n (step S570). Inverter 1-n transmits a diagnosis end command to inverter 1-2 (step S580). As a result, the inverter 1-2 changes the output of the digital output terminal 5-2 from on to off.

Inverter 1-n transmits the diagnosis result to all the inverters (inverters 1-1, 1-2) in the abnormality diagnosis system by broadcasting (step S590), and ends the diagnosis process. The inverter 1-1 stores the diagnosis result in the memory 30-1, and the inverter 1-2 stores the diagnosis result in the memory 30-2 (step S600). As a result, the inverters 1-1 and 1-2 complete the diagnostic process. Either of the processes of step S580 and step S590 may be executed first.

The processing procedure when the abnormality diagnosis system according to the second embodiment diagnoses the digital input terminal 3-2 of the inverter 1-2 is the same as the processing described with reference to FIG. When the digital input terminal 3-2 is diagnosed, the inverter 1-2 broadcasts the diagnosis result to all the inverters (inverters 1-1, 1-n) in the abnormality diagnosis system.

Further, the processing procedure when the abnormality diagnosis system according to the second embodiment diagnoses the analog output terminal 4-2 of the inverter 1-2 is the same as the processing described with reference to FIG. That is, when the digital output terminal 5-2 is diagnosed, the inverter 1-2 changes the output of the digital output terminal 5-2 from off to on, but when the analog output terminal 4-2 is diagnosed, the inverter 1-2 changes the output of the analog output terminal 4-2 from 0 to the maximum voltage. When the analog output terminal 4-2 is diagnosed, the inverter 1-n broadcasts the diagnosis result to all the inverters (inverters 1-1, 1-2) in the abnormality diagnosis system.

Further, the processing procedure when the abnormality diagnosis system according to the second embodiment diagnoses the analog input terminal 2-2 of the inverter 1-2 is the same as the processing described with reference to FIG. When the analog input terminal 2-2 is diagnosed, the inverter 1-2 transmits the diagnosis result to all the inverters (inverters 1-1, 1-n) in the abnormality diagnosis system by broadcasting.

Further, the processing procedure when the abnormality diagnosis system according to the second embodiment diagnoses a component such as the fan 6-2 of the inverter 1-2 is the same as the processing described with reference to FIG. When the parts of the inverter 1-2 are diagnosed, the inverter 1-2 broadcasts the diagnosis result to all the inverters (inverters 1-1, 1-n) in the abnormality diagnosis system.

Inverter 1-1 may send a diagnosis start command to inverter 1-2 after completing the diagnosis process. In this case, the inverter 1-2 becomes the master device, the inverter 1-n becomes the first slave device, and the inverter 1-1 becomes the second slave device, and the diagnostic processing of the inverter 1-n is performed. Specifically, in the inverter 1-n, when the signal input to the digital input terminal 3-n is a signal corresponding to the signal output from the digital output terminal 5-2 included in the inverter 1-2, It is determined that the operation of the digital input terminal 3-n is normal. Further, the inverter 1-n is an analog input terminal when the signal input to the analog input terminal 2-n is a signal corresponding to the signal output from the analog output terminal 4-2 included in the inverter 1-2. It is determined that the operation of 2-n is normal.

Further, in the inverter 1-1, when the signal input to the digital input terminal 3-1 is a signal corresponding to the signal output from the digital output terminal 5-n, the operation of the digital output terminal 5-n is performed. Judge as normal. Further, in the inverter 1-1, when the signal input to the analog input terminal 2-1 is a signal corresponding to the signal output from the analog output terminal 4-n, the operation of the analog output terminal 4-n is performed. Judge as normal. In the second embodiment, the result of determination for the operation of the analog output terminal 4-2 or the digital output terminal 5-2 is the first output determination result. Further, the result of determination for the operation of the analog output terminal 4-n or the digital output terminal 5-n is the second output determination result. Further, the result of determination for the operation of the analog input terminal 2-n or the digital input terminal 3-n is the second input determination result. Further, the result of determination for the operation of the analog output terminal 4-n child or the digital output terminal 5-n is the second output determination result.

Further, the inverter 1-2 may send a diagnosis start command to the inverter 1-n after completing the diagnosis process. In this case, the inverter 1-n becomes the master device, the inverter 1-1 becomes the first slave device, and the inverter 1-2 becomes the second slave device, and the diagnostic processing of the inverter 1-1 is performed. Further, the inverter 1-n may send a diagnosis start command to the inverter 1-1 after the diagnosis process is completed. As a result, the abnormality diagnosis system can periodically diagnose the inverters 1-1, 1-2, 1-n. The transmission / reception of the diagnosis result between the inverters 1-1, 1-2, 1-n may be performed after all the diagnoses for one inverter are completed. Further, the abnormality diagnosis system of the second embodiment may also diagnose the life of the parts in the same manner as the abnormality diagnosis system of the first embodiment.

As described above, the inverters 1-1, 1-2, 1-n transmit the diagnosis results to each other. It is possible to retain the diagnostic results of 2,1-n. Therefore, also in the second embodiment, as in the first embodiment, the abnormality diagnosis system can easily manage the diagnosis results for the plurality of inverters.

Here, the hardware configuration of the logic circuit 7-1 will be described. Since the logic circuits 7-1 to 7-n have the same hardware configuration, the hardware configuration of the logic circuit 7-1 will be described here.

FIG. 9 is a diagram showing a hardware configuration example of the logic circuit according to the first and second embodiments. Some or all the functions of the components constituting the logic circuit 7-1 can be realized by the processing circuit 303.

The processing circuit 303 is dedicated hardware. The processing circuit 303 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Is.

Note that a processor and memory may be used instead of the logic circuit 7-1. That is, the control device that controls each component of the inverter 1-1 may be configured by using the logic circuit 7-1, or may be configured by using the processor and the memory.

FIG. 10 is a diagram showing a hardware configuration example of the control device when the control device of the inverter according to the first and second embodiments is composed of a processor and a memory. Some or all the functions of the components constituting the control device can be realized by the processor 301 and the memory 302.

An example of the processor 301 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor)) or system LSI (Large Scale Integration). Examples of the memory 302 are RAM (Random Access Memory) and ROM (Read Only Memory).

Some functions of the control device are realized by the processor 301 reading and executing a program stored in the memory 302 for executing the operation of the control device. It can also be said that this program causes a computer to execute a procedure or method of a control device. The memory 302 is also used as a temporary memory when the processor 301 executes various processes.

Note that some of the functions of the logic circuit 7-1 may be realized by dedicated hardware, and some may be realized by software or firmware. That is, a part of the functions of the logic circuit 7-1 may be realized by the processor 301 and the memory 302 shown in FIG. 10, and the remaining functions may be realized by the dedicated processing circuit 303 shown in FIG.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1-1, 1-2, 1-n inverter, 2-1, 2-2, 2-n analog input terminal, 3-1, 3-2, 3-n digital input terminal, 4-1, 4-2 , 4-n analog output terminal, 5-1,5-2,5-n digital output terminal, 6-1, 6-2, 6-n fan, 7-1, 7-2, 7-n logic circuit, 8-1,8-2,8-n communication terminals, 10-1,10-2,10-n, 11-1,11-2,11-n,12-1,12-2,12-n, 13-1, 13-2, 13-n switch, 20-1, 20-2, 20-n external device, 30-1, 30-2, 30-n, 302 memory, 301 processor, 303 processing circuit.

Claims (8)

1. A first inverter having a first control unit that controls an electric circuit that converts electric power, a first output terminal that outputs a signal, a first input terminal that inputs a signal, and a first communication unit. When,
   A second control unit that controls an electric circuit that converts electric power, a second output terminal that outputs a signal, a second input terminal that inputs a signal, and a second communication unit that is communicatively connected to the first communication unit. A second inverter having two communication units and
   With
   The first inverter and the second inverter are electrically connected to each other.
   The second control unit outputs a signal from the second output terminal according to an output command transmitted from the first control unit via the first communication unit and the second communication unit. Then input to the first input terminal,
   The first control unit compares the signal input from the second output terminal to the first input terminal with the output command, and compares the second output terminal or the first input terminal. Diagnose abnormalities in
   An abnormality diagnosis system characterized by this.
2. When the signal input from the second output terminal to the first input terminal is a signal corresponding to the output command, the first control unit performs the second output terminal and the first. When it is determined that the operation of the input terminal is normal, and the signal input from the second output terminal to the first input terminal is not a signal corresponding to the output command, the second output terminal Alternatively, it is determined that the operation of the first input terminal is abnormal, and the determination result is transmitted to the second inverter.
   The first inverter and the second inverter store the determination result.
   The abnormality diagnosis system according to claim 1.
3. A first inverter having a first control unit that controls an electric circuit that converts electric power, a first output terminal that outputs a signal, a first input terminal that inputs a signal, and a first communication unit. When,
   A second control unit that controls an electric circuit that converts electric power, a second output terminal that outputs a signal, a second input terminal that inputs a signal, and a second communication unit that is communicatively connected to the first communication unit. A second inverter having two communication units and
   With
   The first inverter and the second inverter are electrically connected to each other.
   The first output terminal outputs a signal according to an output command transmitted from the first control unit and inputs the signal to the second input terminal.
   The first control unit or the second control unit compares the signal input from the first output terminal to the second input terminal with the output command, and compares the output command with the first output terminal. Or diagnose the abnormality of the second input terminal,
   An abnormality diagnosis system characterized by this.
4. The first control unit or the second control unit is the first when the signal input from the first output terminal to the second input terminal is a signal corresponding to the output command. If it is determined that the operation of the output terminal of is normal, and the signal input from the first output terminal to the second input terminal is not a signal corresponding to the output command, the first output terminal Alternatively, it is determined that the operation of the second input terminal is abnormal, and the first inverter and the second inverter store the determination result.
   The abnormality diagnosis system according to claim 3, wherein the abnormality diagnosis system is characterized in that.
5. A first inverter having a first control unit that controls an electric circuit that converts electric power, a first output terminal that outputs a signal, a first input terminal that inputs a signal, and a first communication unit. When,
   When n is a natural number of 3 or more, the nth control unit that controls an electric circuit that converts electric power, the nth output terminal that outputs a signal, the nth input terminal that inputs a signal, and the above. An nth inverter having a first communication unit and an nth communication unit communication-connected,
   A first (n-1) control unit that controls an electric circuit that converts electric power, a first (n-1) output terminal that outputs a signal, and a (n-1) first input terminal that inputs a signal. A third (n-1) inverter having the nth communication unit and a communication connection of the (n-1) th communication unit,
   With
   The first to nth inverters are electrically connected in a loop and are connected.
   The nth control unit follows an output command transmitted from the first control unit via the first communication unit, the (n-1) communication unit, and the nth communication unit. , Output a signal from the nth output terminal and input it to the first input terminal.
   The first control unit compares the signal input from the nth output terminal to the first input terminal with the output command, and compares the nth output terminal or the first input terminal. Diagnose abnormalities in
   An abnormality diagnosis system characterized by this.
6. A first inverter having a first control unit that controls an electric circuit that converts electric power, a first output terminal that outputs a signal, a first input terminal that inputs a signal, and a first communication unit. When,
   A second control unit that controls an electric circuit that converts electric power, a second output terminal that outputs a signal, a second input terminal that inputs a signal, and a second communication unit that is communicatively connected to the first communication unit. A second inverter having two communication units and
   With
   The first inverter and the second inverter are electrically connected to each other.
   The first control unit transmits a diagnostic instruction for diagnosing the life of a specific component.
   The second control unit diagnoses the life of the specific component according to a diagnostic instruction transmitted from the first control unit via the first communication unit and the second communication unit.
   An abnormality diagnosis system characterized by this.
7. A first inverter having a first control unit that controls an electric circuit that converts power, a first output terminal that outputs a signal, a first input terminal that inputs a signal, and a first communication unit. A second control unit that controls an electric circuit that converts power, a second output terminal that outputs a signal, a second input terminal that inputs a signal, and the first communication unit are communicated and connected. The second control unit of the abnormality diagnosis system in which the second inverter having the second communication unit is electrically connected to each other connects the first communication unit and the second communication unit. An input step of outputting a signal from the second output terminal and inputting it to the first input terminal according to an output command transmitted from the first control unit via the first control unit.
   The first control unit compares the signal input from the second output terminal to the first input terminal with the output command, and compares the second output terminal or the first input terminal. Diagnostic steps to diagnose abnormalities in
   An abnormality diagnosis method comprising.
8. A first inverter having a first control unit that controls an electric circuit that converts power, a first output terminal that outputs a signal, a first input terminal that inputs a signal, and a first communication unit. A second control unit that controls an electric circuit that converts power, a second output terminal that outputs a signal, a second input terminal that inputs a signal, and the first communication unit are communicated and connected. The first output terminal of the abnormality diagnosis system in which the second inverter having the second communication unit and the second communication unit are electrically connected to each other transmits a signal according to an output command transmitted from the first control unit. An input step that outputs and inputs to the second input terminal,
   The first control unit or the second control unit compares the signal input from the first output terminal to the second input terminal with the output command, and compares the output command with the first output terminal. Alternatively, a diagnostic step for diagnosing an abnormality in the second input terminal and
   A method for diagnosing an abnormality, which comprises.

Images