Diagnostic equipment and diagnostic systems

Abstract

Attaching various sensors to the refrigerant piping during diagnostic testing is a very time-consuming and laborious process. [Solution] The diagnostic system 70 comprises a first acquisition unit 71, a second acquisition unit 72, a diagnostic processing unit 75, and an output unit 76. The first acquisition unit 71 acquires waveform data of physical quantities obtained from the compressor 3. The second acquisition unit 72 acquires control information INFO stored in the first memory 31b of the microcontroller 31 of the refrigeration cycle device 10. The diagnostic processing unit 75 diagnoses the compressor 3 based on the waveform data and the control information INFO. The output unit 76 outputs the diagnostic results. The second memory 75b of the diagnostic processing unit 75 has a larger capacity than the first memory 31b.

Description

Technical Field

[0001] It relates to a diagnostic device or a diagnostic system for diagnosing a refrigeration cycle device.

Background Art

[0002] Conventionally, an abnormality determination device for determining an abnormality related to a compression unit has been proposed. For example, Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2022-28644) discloses a device that calculates a specific current harmonic component based on a detection signal related to the current of a compressor and performs an abnormality determination.

Summary of the Invention

Problems to be Solved by the Invention

[0003] According to the above device, highly accurate abnormality determination can be performed. However, many microcontrollers installed in refrigeration cycle devices such as air conditioners that are currently widely used do not have the processing ability to perform operations such as calculating current harmonics based on detection signals of compressors. Therefore, when it is desired to diagnose an already installed refrigeration cycle device, an operator needs to carry a computer with high processing power, attach a pressure sensor and a temperature sensor brought along to the refrigerant piping of the refrigeration cycle device, and perform an abnormality determination based on the actually measured sensor values and data during operation.

[0004] However, attaching various sensors to the refrigerant piping when performing a diagnosis such as an abnormality determination is very laborious and time-consuming.

Means for Solving the Problems

[0005] The diagnostic device of the first aspect is a diagnostic device for diagnosing a refrigeration cycle system. The refrigeration cycle system has a refrigerant circuit including a compressor and at least a microcontroller that controls the compressor. The microcontroller includes a first memory. The diagnostic device comprises a first acquisition unit, a second acquisition unit, a diagnostic processing unit, an output unit, and a sensor. The first acquisition unit acquires waveform data of physical quantities obtained from the compressor. The second acquisition unit acquires control information of the refrigeration cycle system stored in the first memory. The diagnostic processing unit diagnoses the compressor based on the waveform data acquired by the first acquisition unit and the control information acquired by the second acquisition unit. The output unit outputs the diagnostic results from the diagnostic processing unit. The sensor is detachably attached to the compressor of the refrigeration cycle system. The diagnostic processing unit includes a second memory. The second memory has a larger capacity than the first memory. The first acquisition unit acquires waveform data of physical quantities from the sensor via wired communication.

[0006] The diagnostic processing unit of this diagnostic device includes a second memory with a larger capacity than the first memory of the microcontroller. Therefore, even if the first memory of the microcontroller installed in the refrigeration cycle unit is unable to perform the necessary diagnostic processing, the diagnostic device can perform highly accurate diagnoses.

[0007] Furthermore, in this diagnostic device, the second acquisition unit acquires control information for the refrigeration cycle system from the first memory of the microcontroller of the refrigeration cycle system. Therefore, the person performing the diagnosis does not need to install pressure sensors or temperature sensors on the refrigerant piping of the refrigeration cycle system during the diagnosis, and can obtain diagnostic results using control information obtained from sensors that are originally installed in the refrigeration cycle system.

[0008] The second diagnostic system is a diagnostic system for diagnosing a refrigeration cycle device. The refrigeration cycle device has a refrigerant circuit including a compressor and at least a microcontroller that controls the compressor. The microcontroller includes a first memory. The diagnostic system comprises a first acquisition unit, a second acquisition unit, a diagnostic processing unit, and an output unit. The first acquisition unit acquires waveform data of physical quantities obtained from the compressor. The second acquisition unit acquires control information of the refrigeration cycle device stored in the first memory. The diagnostic processing unit diagnoses the compressor based on the waveform data acquired by the first acquisition unit and the control information acquired by the second acquisition unit. The output unit outputs the diagnostic results from the diagnostic processing unit. The diagnostic processing unit includes a second memory. The second memory has a larger capacity than the first memory.

[0009] The diagnostic processing unit of this diagnostic system includes a second memory with a larger capacity than the first memory of the microcontroller. Therefore, even if the first memory of the microcontroller installed in the refrigeration cycle unit is unable to perform the necessary diagnostic processing, the diagnostic system can perform highly accurate diagnoses.

[0010] Furthermore, in this diagnostic system, the second acquisition unit acquires control information for the refrigeration cycle from the first memory of the microcontroller of the refrigeration cycle. Therefore, the person performing the diagnosis does not need to install pressure sensors or temperature sensors on the refrigerant piping of the refrigeration cycle during the diagnosis, and can obtain diagnostic results using control information obtained from sensors that are originally installed in the refrigeration cycle.

[0011] The diagnostic device of the third perspective is the diagnostic device of the first perspective, and the refrigeration cycle device further has a printed circuit board on which a microcontroller is mounted. The printed circuit board has a connector for attaching a wired communication line, or a communication unit for short-range wireless communication. The second acquisition unit acquires control information by communicating bidirectionally with the microcontroller via the communication line or short-range wireless communication.

[0012] The third diagnostic system is the second diagnostic system, wherein the refrigeration cycle device further includes a printed circuit board on which a microcontroller is mounted. The printed circuit board has a connector for attaching wired communication lines or a communication unit for short-range wireless communication. The second acquisition unit acquires control information by communicating bidirectionally with the microcontroller via the communication line or short-range wireless communication.

[0013] The diagnostic device of the fourth perspective is a diagnostic device of the first or third perspective, wherein the refrigeration cycle device to be diagnosed further has a printed circuit board on which a microcontroller is mounted. The printed circuit board has a connector for attaching a wired communication line, or a communication unit for short-range wireless communication. The second acquisition unit acquires control information via the communication line or short-range wireless communication. In acquiring control information, the second acquisition unit transmits the address of the first memory where the control information is stored to the microcontroller. In addition, in acquiring control information, the microcontroller transmits the variables stored at the received address to the second acquisition unit. Furthermore, in acquiring control information, the second acquisition unit receives the variables.

[0014] The fourth diagnostic system is a second or third diagnostic system, wherein the refrigeration cycle device to be diagnosed further has a printed circuit board on which a microcontroller is mounted. The printed circuit board has a connector for attaching a wired communication line or a communication unit for short-range wireless communication. The second acquisition unit acquires control information via the communication line or short-range wireless communication. In acquiring control information, the second acquisition unit transmits the address of the first memory where the control information is stored to the microcontroller. In acquiring control information, the microcontroller transmits the variables stored at the received address to the second acquisition unit. Furthermore, in acquiring control information, the second acquisition unit receives the variables.

[0015] The diagnostic device of the fifth perspective is a diagnostic device of the first, third, or fourth perspective, wherein the refrigeration cycle system to be diagnosed further comprises a heat source unit housing a compressor and a microcontroller, and a utilization unit. The heat source unit further includes a first communication unit and a second communication unit for communicating with the utilization unit. The second communication unit is a communication unit for communicating with equipment other than the refrigeration cycle system. The second acquisition unit is connected to the second communication unit and acquires control information from the first memory.

[0016] The fifth diagnostic system is a second, third, or fourth diagnostic system, wherein the refrigeration cycle device to be diagnosed further comprises a heat source unit housing a compressor and a microcontroller, and a utilization unit. The heat source unit further includes a first communication unit and a second communication unit for communicating with the utilization unit. The second communication unit is a communication unit for communicating with equipment other than the refrigeration cycle device. The second acquisition unit is connected to the second communication unit and acquires control information from the first memory.

[0017] The diagnostic device for the sixth perspective is the diagnostic device for the fifth perspective, and the second acquisition unit performs bidirectional communication with the second communication unit when acquiring control information from the first memory.

[0018] The sixth diagnostic system is the fifth diagnostic system, and the second acquisition unit performs bidirectional communication with the second communication unit when acquiring control information from the first memory.

[0019] The seventh diagnostic system is a diagnostic system from either the second or sixth perspective, further comprising a sensor attached to the compressor in the diagnosis of the compressor. The first acquisition unit acquires waveform data of physical quantities from the sensor via wireless communication.

[0020] The diagnostic device for the eighth perspective is a diagnostic device for either the first perspective or the third perspective to the sixth perspective, and the capacity of the second memory is greater than or equal to the first capacity calculated by the following formula 1. The capacity of the first memory is less than the first capacity calculated by the following formula 1. Formula 1: First capacity (bytes) = Maximum rotation speed (rps) of the compressor × Number of poles of the compressor × 240

[0021] The diagnostic system from the eighth perspective is a diagnostic system from any one of the second perspective or the third to seventh perspectives, and the capacity of the second memory is not less than the first capacity calculated by the following Formula 1. The capacity of the first memory is smaller than the first capacity calculated by the following Formula 1. Formula 1: First capacity (bytes) = Maximum rotation speed (rps) of the compressor × Number of poles of the compressor × 240

[0022] The diagnostic device from the ninth perspective is a diagnostic device from any one of the first perspective, the third to sixth perspectives, or the eighth perspective, and the capacity of the second memory is not less than 512 kilobytes. The capacity of the first memory is not more than 256 kilobytes.

[0023] The diagnostic system from the ninth perspective is a diagnostic system from any one of the second perspective or the third to eighth perspectives, and the capacity of the second memory is not less than 512 kilobytes. The capacity of the first memory is not more than 256 kilobytes.

[0024] The diagnostic device from the tenth perspective is a diagnostic device from any one of the first perspective, the third to sixth perspectives, the eighth perspective, or the ninth perspective, and the physical quantity obtained from the compressor is the current value of the compressor.

[0025] The diagnostic system from the tenth perspective is a diagnostic system from any one of the second perspective or the third to ninth perspectives, and the physical quantity obtained from the compressor is the current value of the compressor.

[0026] The diagnostic device from the eleventh perspective is a diagnostic device from any one of the first perspective, the third to sixth perspectives, or any one of the eighth to tenth perspectives, and the control information includes information correlated with at least one of the discharge pressure which is the pressure of the refrigerant discharged from the compressor, the suction pressure which is the pressure of the refrigerant sucked into the compressor, and the rotation speed of the compressor.

[0027] The diagnostic system according to the 11th aspect is a diagnostic system according to any one of the 2nd aspect or the 3rd aspect to the 10th aspect, and the control information includes information correlated with at least one of the discharge pressure which is the pressure of the refrigerant discharged from the compressor, the suction pressure which is the pressure of the refrigerant sucked into the compressor, and the rotational speed of the compressor.

[0028] The diagnostic device according to the 12th aspect is a diagnostic device according to any one of the 1st aspect, the 3rd aspect to the 6th aspect, or the 8th aspect to the 1th aspect, and in the diagnosis of the compressor, the diagnostic processing unit obtains the rotational speed of the compressor based on the waveform data.

[0029] The diagnostic system according to the 12th aspect is a diagnostic system according to the 2nd aspect or any one of the 3rd aspect to the 11th aspect, and in the diagnosis of the compressor, the diagnostic processing unit obtains the rotational speed of the compressor based on the waveform data.

[0030] The diagnostic device according to the 13th aspect is the diagnostic device according to the 12th aspect, and further includes a third acquisition unit. The third acquisition unit acquires information capable of specifying the number of poles of the compressor. The physical quantity obtained from the compressor is the current value or voltage value of the compressor. In the diagnosis of the compressor, the diagnostic processing unit obtains the rotational speed of the compressor based on the waveform data and the information on the number of poles acquired by the third acquisition unit.

[0031] The diagnostic system according to the 13th aspect is the diagnostic system according to the 12th aspect, and further includes a third acquisition unit. The third acquisition unit acquires information capable of specifying the number of poles of the compressor. The physical quantity obtained from the compressor is the current value or voltage value of the compressor. In the diagnosis of the compressor, the diagnostic processing unit obtains the rotational speed of the compressor based on the waveform data and the information on the number of poles acquired by the third acquisition unit.

Brief Description of the Drawings

[0032] [Figure 1] It is a schematic configuration diagram showing a diagnostic system (diagnostic device) and a refrigeration cycle device which is its diagnostic target. [Figure 2]This is a schematic perspective view showing a diagnostic system connected to the outdoor unit of a refrigeration cycle system via communication lines, etc. [Figure 3] This block diagram shows a diagnostic system and the refrigeration cycle equipment that it is being diagnosed with. [Figure 4] This is a Bode plot showing the transmission characteristics from the compressor's load torque to the motor's output torque. [Figure 5] This is a diagram to explain the diagnostic method. [Figure 6A] This is a block diagram of the diagnostic system related to modified example A. [Figure 6B] This is a block diagram of the diagnostic system related to modified example B. [Modes for carrying out the invention]

[0033] The diagnostic system 70 will be described below based on the drawings. First, the refrigeration cycle device 10, which has the compressor 3 that is the subject of the diagnostic process, will be described, followed by a description of the diagnostic system 70.

[0034] (1) Refrigeration cycle equipment (1-1) Overall structure The refrigeration cycle device 10 shown in Figure 1 is a device that performs a vapor compression type refrigeration cycle operation, and is specifically used as an air conditioning system, a hot water supply system, etc. Here, we will describe the refrigeration cycle device 10 used as a multi-type air conditioning system.

[0035] The refrigeration cycle system 10 is a device for cooling or heating indoor spaces within buildings such as office buildings. The refrigeration cycle system 10 mainly comprises one outdoor unit 1 located outside the building and multiple indoor units 2 connected in parallel to it. The refrigerant circuit 10a of the refrigeration cycle system 10 is configured such that the outdoor unit 1 and the indoor units 2 are connected by liquid refrigerant connecting pipes 11 and gas refrigerant connecting pipes 12.

[0036] The outdoor unit 1 includes a compressor 3, a four-way switching valve 4, an outdoor heat exchanger 5, and an outdoor expansion valve 6. The indoor unit 2 includes an indoor heat exchanger 7 and an indoor expansion valve 8. In the indoor heat exchanger 7, the refrigerant exchanges heat with the air inside the building. The refrigerant circuit 10a of the refrigeration cycle device 10 mainly consists of a compressor 3, a four-way switching valve 4, an outdoor heat exchanger 5, an outdoor expansion valve 6, an indoor expansion valve 8, and an indoor heat exchanger 7, and each piece of equipment is connected by refrigerant piping. The four-way switching valve 4 switches the flow of the refrigerant between the dashed line (heating) and the solid line (cooling) in Figure 1.

[0037] (1-2) Compressor configuration The compressor 3, which compresses the refrigerant, is a compressor capable of varying its operating capacity and is a positive displacement compressor driven by a motor 3a whose rotational speed is controlled by an inverter. The compressor 3 is, for example, a rotary or scroll type compressor, and has a structure in which there is a gap in the compression chamber and the compression chamber is sealed with oil. Furthermore, the compressor 3 has a structure in which the compression mechanism and the motor 3a are mechanically connected, and the compression torque generated during the compression process is correlated with the motor torque emitted by the motor 3a. The motor 3a is a three-phase motor.

[0038] (1-3) Control unit of the refrigeration cycle system The control unit of the refrigeration cycle device 10 is configured by connecting an outdoor control unit located in the outdoor unit 1 and an indoor control unit located in the indoor unit 2 via a communication line. As shown in Figures 1 and 3, the outdoor control unit has a first circuit board 30 and a second circuit board 40. The first circuit board 30 is the main printed circuit board and has a microcontroller 31, a first connector 32a, a second connector 32b, etc. mounted on it. The second circuit board 40 is an inverter board for the motor 3a of the compressor 3 and is connected to the motor 3a by three lead wires 40a. In addition to the connection of the second circuit board 40 to the first circuit board 30 of the outdoor control unit, the following are also connected: a discharge temperature sensor 1a for measuring the temperature of the refrigerant discharged from the compressor 3, an intake temperature sensor 1b for measuring the temperature of the refrigerant drawn into the compressor 3, an outside temperature sensor 1c for measuring the outside temperature, and pressure sensors for measuring the refrigerant pressure in each part.

[0039] The microcontroller 31 is a computer for controlling the outdoor expansion valve 6, the four-way switching valve 4, and the compressor 3 of the refrigeration cycle device 10. The microcontroller 31 is an LSI that integrates electronic components such as resistors, capacitors, and transistors, and is mounted on the first circuit board 30. The microcontroller 31 includes a first CPU 31a that performs control calculations and a first memory 31b as a storage device. CPU stands for Central Processing Unit. Here, RAM (Random Access Memory) is used as the first memory 31b. The first CPU 31a, which is a processor, reads a program stored in a non-volatile auxiliary storage device such as ROM (Read Only Memory) and performs predetermined calculation processing according to this program. Furthermore, the first CPU 31a can write the calculation results to the first memory 31b or read information stored in the first memory 31b, etc., according to the program. The first memory 31b is also used as a database for storing control information INFO. The control information INFO is data that includes values ​​for the refrigerant state (temperature and pressure) at each point in the refrigerant circuit 10a during operation of the refrigeration cycle device 10, as well as the ambient temperature.

[0040] The clock speed of the first CPU 31a is 80MHz or 100MHz, and the capacity of the first memory 31b is 256 kilobytes or less.

[0041] Furthermore, the second board 40, which is an inverter board, also has a microcontroller mounted on it, but its performance is lower than that of the diagnostic processing unit 75 (described later). The memory capacity of the microcontroller on the second board 40 is smaller than the capacity of the second memory 75b of the diagnostic processing unit 75.

[0042] (1-4) Operation During heating operation, the refrigerant discharged from the compressor 3 passes through the indoor heat exchanger 7, indoor expansion valve 8, outdoor expansion valve 6, and outdoor heat exchanger 5 before being drawn back into the compressor 3. The indoor air is heated by heat exchange with the refrigerant condensing in the indoor heat exchanger 7.

[0043] During cooling operation, the refrigerant discharged from the compressor 3 passes through the outdoor heat exchanger 5, outdoor expansion valve 6, indoor expansion valve 8, and indoor heat exchanger 7 before being drawn back into the compressor 3. The indoor air is cooled by heat exchange with the refrigerant evaporating in the indoor heat exchanger 7.

[0044] (2) Diagnostic system (2-1) Composition The diagnostic system 70 can take various forms, but here we will describe a type that a maintenance person brings to the site (the installation location of the refrigeration cycle device 10). As shown in Figures 2 and 3, the diagnostic system 70 is a portable device with a touch panel 70a and operation buttons 70b on the exterior of a single housing, and a diagnostic processing unit 75 including a second CPU 75a and a second memory 75b, a first acquisition unit 71 including an A / D converter 71a, a second acquisition unit 72, a third acquisition unit 73, an output unit 76, etc., arranged inside the housing. In other words, the diagnostic system 70 according to this embodiment is a portable diagnostic device that a maintenance person, who is the diagnostician, brings to the installation location of the refrigeration cycle device 10.

[0045] The diagnostic system 70 is connected to the refrigeration cycle device 10 by a maintenance person via current sensors CT1 and CT2 such as current transformers, electric wires 78 extending from the current sensors CT1 and CT2 and connected to the first acquisition unit 71, and a communication line 79 connecting the second connector 32b of the first circuit board 30 of the refrigeration cycle device 10 to the second acquisition unit 72.

[0046] The current sensors CT1 and CT2 are clamp-type external sensors that are attached to two of the three lead wires 40a connecting the motor 3a of the compressor 3 of the refrigeration cycle unit 10 to the second board 40, which is the inverter board, by a maintenance person who visits the building where the refrigeration cycle unit 10 is installed to perform a diagnosis. The current sensors CT1 and CT2 and the first acquisition unit 71 are connected by an electric wire 78. This allows the first acquisition unit 71 to directly measure the input current (three-phase phase current) to the motor 3a of the compressor 3 as waveform data of a physical quantity obtained from the compressor 3.

[0047] The first acquisition unit 71 acquires data from current sensors CT1 and CT2 using an A / D converter 71a. The maximum sampling frequency of the A / D converter 71a is preferably 600Hz or higher when the number of poles of the compressor 3 is 4, and preferably 400Hz or higher when the number of poles of the compressor 3 is 6. In Japan, due to regulations (Foreign Exchange and Foreign Trade Act), the maximum inverter output frequency of the compressors of many refrigeration cycle devices is less than 600Hz, and the maximum rotational speed of the compressor 3 is less than 300rps when the number of poles of the compressor 3 is 4, and less than 200rps when the number of poles of the compressor 3 is 6. In order to ensure a sampling frequency of more than twice the rotational speed of the compressor 3, an A / D converter 71a with the above-mentioned maximum sampling frequency is used in this embodiment. Furthermore, the capacity of the second memory 75b, described later, is determined based on these Japanese regulations (export restrictions).

[0048] In this configuration, the phase currents of two of the three phases of motor 3a are detected by current sensors CT1 and CT2, and the phase current of the remaining phase is calculated by the diagnostic processing unit 75. Alternatively, each of the three phases may be measured by three different current sensors.

[0049] The second acquisition unit 72 acquires control information INFO for the refrigeration cycle device 10 stored in the first memory 31b of the microcontroller 31 by communicating bidirectionally with the microcontroller 31. Specifically, the second acquisition unit 72 requests information from the microcontroller 31, including the data size, and in response to this request, the microcontroller 31 sends the control information INFO to the second acquisition unit 72. The communication line 79 is a monitor cable for maintenance personnel who have gone to the site with the diagnostic system 70 to connect the second acquisition unit 72 to the first board 30. The first board 30 of the microcontroller 31 is equipped with a second connector 32b for connecting the communication line 79. The second connector 32b functions as a communication unit for the refrigeration cycle device 10 to communicate with the diagnostic system 70, together with the microcontroller 31.

[0050] In addition to the second connector 32b, the first circuit board 30 of the outdoor control unit of the refrigeration cycle device 10 also has a first connector 32a for connecting the communication line 13 extending from the indoor control unit (see Figure 3). The first connector 32a is a conventional connector and is provided for the outdoor control unit to receive signals from the indoor control unit. For example, the indoor control unit sends a signal to the outdoor control unit via the communication line 13 requesting an increase in output according to the magnitude of the difference between the set temperature and the indoor temperature. In this way, the first connector 32a functions as a communication unit for communicating with the indoor control unit of the indoor unit 2 together with the microcontroller 31.

[0051] The third acquisition unit 73 has a touch panel 73a. Information that can identify the number of poles of the compressor 3 is entered on-site by a maintenance person using the touch panel 73a, or entered in advance by a technician or the like before going to the site.

[0052] The diagnostic processing unit 75 is a computer for diagnosing the compressor 3 of the refrigeration cycle device 10. The diagnostic processing unit 75 has a second CPU 75a and a second memory 75b. The second CPU 75a has a higher clock speed and performance than the first CPU 31a of the microcontroller 31. Here, a processor with a clock speed of 120MHz or higher is used as the first CPU 31a. The second memory 75b is a storage device and has a larger capacity than the first memory 31b of the microcontroller 31. The capacity of the second memory 75b is 512 kilobytes or more. The diagnostic processing unit 75 also has 32 megabytes of ROM and EEPROM.

[0053] The diagnostic processing unit 75 diagnoses the compressor 3 based on the waveform data acquired by the first acquisition unit 71 and the control information INFO acquired by the second acquisition unit 72.

[0054] The output unit 76 outputs the diagnostic results from the diagnostic processing unit 75.

[0055] (2-2) Diagnostic process (2-2-1) Subjects of diagnosis, diagnostic procedures, and diagnostic processing flow The diagnostic system 70 is a system for diagnosing the compressor 3 of the refrigeration cycle device 10. Here, we will explain using the diagnosis of deterioration of the mechanical elements of the compressor 3 as an example. The mechanical elements of the compressor 3 include, for example, the movable members of the compression mechanism that are moved by the motor 3a. The judgment (diagnosis) regarding deterioration includes a judgment of the degree of abnormality, which represents the degree to which the mechanical elements of the compressor 3 deviate from the normal state. Deterioration of mechanical elements includes, for example, wear of the bearings and movable members of the compressor 3, and a decrease in the oil sealing performance of the compression chamber of the compressor 3.

[0056] The maintenance person goes to the building where the refrigeration cycle unit 10 to be diagnosed is installed, stops the refrigeration cycle unit 10, and removes a part of the casing of the outdoor unit 1. Then, as shown in Figures 2 and 3, the maintenance person attaches the current sensors CT1 and CT2 to the lead wires 40a extending from the motor 3a to the second circuit board 40. They also open the electrical component box and insert the terminals at the end of the communication line 79 into the second connector 32b of the first circuit board 30. As a result, the first acquisition unit 71 of the diagnostic system 70 is able to acquire waveform data of the actual current value of the motor 3a, and the second acquisition unit 72 is able to acquire control information INFO of the operating refrigeration cycle unit 10 from the first memory 31b of the microcontroller 31.

[0057] Note that in Figure 2, for the sake of ease of understanding, the illustration of the top panel of the outdoor unit 1, which does not need to be removed during maintenance, has been omitted.

[0058] The maintenance personnel turn on the power to the diagnostic system 70 and operate the refrigeration cycle unit 10, allowing the first acquisition unit 71 and the second acquisition unit 72 of the diagnostic system 70 to acquire information about the refrigeration cycle unit 10 for a certain period of time and perform diagnostic processing. The second acquisition unit 72 transmits the address of the first memory 31b, where the control information INFO is stored, to the microcontroller 31 via the communication line 79. In response, the microcontroller 31 transmits the variables stored at the received address to the second acquisition unit 72 at a predetermined frequency. Upon receiving these variables, the second acquisition unit 72 acquires the control information INFO.

[0059] Furthermore, the number of poles of the compressor 3 is determined based on the information acquired by the third acquisition unit 73 of the diagnostic system 70. For example, when the model information of the compressor 3 is entered by a maintenance person, the number of poles associated with that model information is determined in the diagnostic system 70.

[0060] The diagnostic processing unit 75 of the diagnostic system 70 performs FFT analysis (frequency analysis) on the waveform data acquired by the first acquisition unit 71 to perform diagnostic processing on the compressor 3. In addition to the waveform data, the diagnostic processing unit 75 determines the rotational speed of the compressor 3 based on the number of poles of the compressor 3. Then, the diagnostic processing unit 75 performs the known diagnostic processing described later. The diagnostic results are output to an external device by the output unit 76 and are also displayed on the touch panel 73a.

[0061] (2-2-2) An example of a specific diagnostic process The diagnostic processing of the compressor 3 by the diagnostic processing unit 75 is similar to the compressor abnormality detection process known from Patent Document 1 (Japanese Patent Application Publication No. 2022-28644). Below, only an overview of one example will be described with reference to Figures 4 and 5.

[0062] Figure 4 is a Bode plot (gain plot) showing an example of the transmission characteristics from the load torque of the compressor 3 to the output torque of the motor 3a. When the mechanical elements of the compressor 3 deteriorate, the load torque changes compared to the normal state. Therefore, in response to the change in load torque corresponding to the deterioration of the compressor 3, the microcontroller on the second board 40 changes the output torque of the motor 3a. In this case, the change in output torque corresponding to the deterioration of the compressor 3 causes the current of the motor 3a to change from the range corresponding to the normal state. Therefore, the diagnostic processing unit 75 uses the electrical characteristics of the compressor 3 (motor 3a) to make a judgment regarding the deterioration of the mechanical elements of the compressor 3.

[0063] The diagnostic processing unit 75 performs a diagnosis regarding the deterioration of the compressor 3, taking into account the fluctuations in the relationship between the deterioration of the mechanical elements of the compressor 3 and the electrical characteristics of the compressor 3 due to changes in rotational frequency. As an example of a specific diagnostic method, the diagnosis of bearing wear of the compressor 3 will be described. The diagnostic processing unit 75 includes, as functional units, an electrical characteristic calculation unit, a correction unit, a judgment criterion generation unit, and a deterioration judgment unit. The electrical characteristic calculation unit calculates the electrical characteristics used for diagnosing the compressor 3. The electrical characteristics are specific frequency components (e.g., harmonic components) of a signal representing a physical quantity correlated with the current of the motor 3a. The harmonic components of the signal representing a physical quantity correlated with the current of the motor 3a mean components that are positive integer multiples of the rotational frequency of the motor 3a in the signal representing a physical quantity correlated with the current of the motor 3a. The electrical characteristic calculation unit calculates the frequency components from the waveform data of the current value of the motor 3a taken from the compressor 3. Specifically, the electrical feature calculation unit of the diagnostic processing unit 75 calculates the second and third harmonics of the magnitude of the current vector. As bearing wear progresses, the magnitude of the second and higher current harmonics changes compared to the normal state (when bearing wear is not progressing relatively) (specifically, they become larger). Here, the magnitude of the current vector is the square root of the sum of the squares of each of the three phase currents of the motor 3a. Furthermore, the second-order magnitude of the current vector represents the frequency component of the magnitude of the current vector that is twice the rotation frequency, and the third-order magnitude of the current vector represents the frequency component that is three times the rotation frequency.

[0064] The correction unit of the diagnostic processing unit 75 corrects the deviation of the relationship between the electrical features and the deterioration of the object to be judged from a predetermined reference state. Based on the transmission characteristics from the load torque of the compressor 3 to the electrical signal (current) of the motor 3a, the correction unit calculates the gain at the frequencies corresponding to the second and third current harmonics calculated by the electrical feature calculation unit. Then, the correction unit corrects the second and third current harmonics used for deterioration diagnosis by dividing the second and third current harmonics calculated by the electrical feature calculation unit by the calculated gain. The frequencies corresponding to the second and third current harmonics calculated by the electrical feature calculation unit are 2 and 3 times the rotation frequency of the compressor 3 when the detection signal of the current used to calculate the second and third current harmonics was acquired, respectively. The transmission characteristics from the load torque of the compressor 3 to the electrical signal of the motor 3a correspond to the transmission characteristics until the deterioration of the mechanical elements of the compressor 3 appears in the electrical features. Hereinafter, the current harmonics that have been divided by the gain and corrected to the dimensions of load torque may be referred to as "corrected current harmonics." This corrected current harmonics (in the dimensions of load torque), which have been corrected in a way that suppresses differences (fluctuations) in how abnormalities manifest due to changes in the rotation frequency of compressor 3, are used for deterioration diagnosis.

[0065] The judgment criterion generation unit of the diagnostic processing unit 75 estimates the first harmonic component of the load torque dimension under normal conditions (hereinafter referred to as "normal-condition corrected current harmonics") based on detection signals related to the operating state of the compressor 3 under normal conditions (e.g., temperature, pressure, etc.). For example, the memory of the diagnostic processing unit 75 pre-stores the relationship between reference information corresponding to the normal-condition corrected current harmonics and detection signals related to the operating state of the compressor 3 as formulas or maps. As a result, the judgment criterion generation unit can estimate the normal-condition corrected current harmonics based on these formulas or maps and detection signals related to the operating state of the compressor 3. Note that the formulas or maps representing the relationship between reference information corresponding to the normal-condition corrected current harmonics and detection signals related to the operating state of the compressor 3 may be predetermined through experiments or simulations, for example.

[0066] The deterioration determination unit of the diagnostic processing unit 75 determines the deterioration of the mechanical elements of the compressor 3. In this example, the deterioration determination unit determines the deterioration related to bearing wear based on corrected electrical characteristics. Whether or not a condition corresponds to bearing wear as a deterioration state can be estimated by, for example, estimating the degree of deterioration based on how much the corrected current harmonics output from the correction unit deviate from the normal-condition corrected current harmonics used as reference information. Specifically, the deterioration determination unit may estimate the degree of deterioration based on the difference between the normal-condition corrected current harmonics used as reference information and the corrected current harmonics output from the correction unit. Alternatively, the deterioration determination unit may estimate the degree of deterioration based on the ratio between the normal-condition corrected current harmonics used as reference information and the corrected current harmonics output from the correction unit.

[0067] Furthermore, the diagnostic processing unit 75 may perform an abnormality determination using information about a boundary that distinguishes between normal and abnormal conditions on a two-variable coordinate system where the primary current harmonic and rotation frequency of the compressor 3 are variables (hereinafter referred to as "abnormality determination boundary information"). Specifically, the diagnostic processing unit 75 may perform an abnormality determination based on whether the coordinate defined by the current harmonic calculated by the electrical feature calculation unit and the rotation frequency corresponding to that current harmonic is on the abnormal side or the normal side of the boundary defined by the abnormality determination boundary information. The abnormality determination boundary information is predetermined (generated) by so-called supervised machine learning. As shown in Figure 5, training data representing the normal state of the compressor 3 (squares) and training data representing the abnormal state (circles) are plotted on a coordinate system where the vertical axis and horizontal axis are the primary current harmonic and rotation frequency, respectively. By performing machine learning using this training data, a boundary 801 that distinguishes between normal and abnormal conditions on a two-variable coordinate system where the primary current harmonic and rotation frequency of the compressor 3 are variables is generated. The value of the first current harmonic on boundary 801 fluctuates in accordance with the change in the rotation frequency of the compressor 3. Boundary 801 takes into account the change in the relationship between abnormalities (deterioration) of the mechanical elements of the compressor 3 and the electrical characteristics of the compressor 3 (in this example, the first current harmonic of the magnitude of the current vector) due to changes in the rotation frequency of the compressor 3. Even when data 802 (white triangle) and data 803 (black triangle) with different rotation frequencies are input, the diagnostic processing unit 75 uses boundary 801 to determine the former as a normal state and the latter as an abnormal state.

[0068] Furthermore, the diagnostic processing unit 75 may perform a deterioration diagnosis of the compressor 3 on a multivariable coordinate system that includes the primary current harmonics and rotational frequency of the compressor 3, as well as other parameters related to operating conditions (e.g., temperature, discharge pressure, suction pressure, etc.). In this case, the boundary information for abnormality determination defines a boundary that distinguishes between normal and abnormal conditions on the multivariable coordinate system that includes the primary current harmonics and rotational frequency of the compressor 3, as well as other parameters related to operating conditions. In this case as well, the machine learning method described above is applied to generate the boundary information for abnormality determination.

[0069] (3) Features (3-1) The diagnostic system 70, which is a portable diagnostic device according to this embodiment, is a device that a maintenance person responsible for the maintenance (diagnosis, etc.) of the refrigeration cycle device 10 will bring to the site (the location where the refrigeration cycle device 10 is installed).

[0070] Conventional diagnostic equipment, as described in the summary of the invention above, involves attaching pressure and temperature sensors brought by the user to the refrigerant piping of the refrigeration cycle system, and then connecting these sensors to the diagnostic equipment to perform the diagnosis. This process of attaching sensors to the refrigerant piping is very time-consuming, and if the sensors are not attached properly, it can lead to problems such as incorrect diagnoses.

[0071] To address these issues, in the diagnostic system 70, a portable diagnostic device according to this embodiment, the second acquisition unit 72 acquires control information INFO of the refrigeration cycle device 10 from the first memory 31b of the microcontroller 31 of the refrigeration cycle device 10. Therefore, maintenance personnel performing diagnostics on the compressor 3 do not need to attach external pressure sensors or temperature sensors to the refrigerant circuit 10a (refrigerant piping) of the refrigeration cycle device 10 during the diagnostic process. Even without external temperature sensors or pressure sensors, the diagnostic system 70 can obtain diagnostic results using control information INFO obtained from sensors (discharge temperature sensor 1a, suction temperature sensor 1b, ambient temperature sensor 1c, pressure sensor, etc.) that are originally installed in the refrigeration cycle device 10.

[0072] Furthermore, the diagnostic processing unit 75 of the diagnostic system 70, which is a diagnostic device according to this embodiment, includes a second memory 75b with a larger capacity than the first memory 31b of the microcontroller 31. The capacity of the second memory 75b is 512 kilobytes or more, compared to the first memory 31a, which has a capacity of 256 kilobytes or less. Therefore, although the first memory 31b (a memory with a small capacity) of the microcontroller 31 mounted on the refrigeration cycle device 10 cannot perform the processing necessary for diagnosis, the diagnostic system 70 can perform a highly accurate diagnosis of the compressor 3. In particular, it is useful for diagnosis using frequency analysis, which requires acquiring waveform data and a large amount of memory.

[0073] (3-2) The diagnostic system 70 is equipped with an A / D converter 71a that can secure a sampling frequency of more than twice the rotational speed (rps) of the compressor 3. Therefore, it can calculate the minimum necessary primary (1x rotational speed) component from the waveform data of the physical quantity (current value) obtained from the compressor 3. Furthermore, by increasing the sampling frequency by 4x, 6x, etc., secondary and tertiary harmonic components can be calculated.

[0074] (3-3) In the diagnostic system 70, the diagnostic processing unit 75 determines the rotational speed of the compressor 3 based on the number of poles of the compressor 3, in addition to the waveform data.

[0075] For example, consider the case where the rotational frequency component of the magnitude of the current vector is used as an electrical feature. The rotational frequency component of the magnitude of the current vector is determined from the frequency analysis result and the compressor's rotational frequency. Here, since the frequency analysis result and the compressor's rotational frequency are affected by the microcontroller's clock error, there is a discrepancy between the calculated frequency value and the actual frequency value. For this reason, if frequency analysis and compressor rotational frequency calculation are performed with different microcontrollers, the correct rotational frequency component of the magnitude of the current vector cannot be obtained, and the diagnostic accuracy deteriorates. On the other hand, as explained earlier, if the diagnostic processing unit 75 is configured to determine the rotational speed based on waveform data and the number of poles, then frequency analysis and compressor rotational frequency calculation are performed with the same microcontroller, and the same amount of clock error effect occurs in the frequency analysis result and the compressor's rotational frequency. This effect is exactly canceled out when determining the rotational frequency component of the magnitude of the current vector, and the correct rotational frequency component of the magnitude of the current vector is obtained. Therefore, the diagnostic accuracy is improved.

[0076] (3-4) In the diagnostic system 70, the second acquisition unit 72 acquires control information INFO of the refrigeration cycle device 10 from the microcontroller 31 by bidirectional communication with the microcontroller 31. Specifically, the second acquisition unit 72 requests information from the microcontroller 31, including the data size, and the diagnostic system 70 is able to acquire control information INFO at the level necessary for diagnosis. For example, it can request detailed data up to one decimal place regarding the values ​​of refrigerant temperature and refrigerant pressure, or request the data update frequency in the refrigeration cycle device 10, and through bidirectional communication, the second acquisition unit 72 of the diagnostic system 70 can acquire control information INFO necessary for appropriate diagnosis.

[0077] (3-5) (3-5-1) As described above, in Japan, due to regulations, the maximum inverter output frequency of many compressors in refrigeration cycle systems is less than 600Hz. When compressor 3 has 4 poles, the maximum rotational speed of compressor 3 is approximately 300rps, and when compressor 3 has 6 poles, the maximum rotational speed of compressor 3 is approximately 200rps.

[0078] (3-5-2) In light of these circumstances, the second memory 75b of the diagnostic system 70 of this embodiment is set to be larger than the first capacity calculated by the following formula 1. Equation 1: First capacity (bytes) = Maximum compressor rotational speed (rps) × Number of compressor poles × 240

[0079] Equation 1 is derived from the following findings (A) to (D).

[0080] (A) First capacity = frequency component to be detected × 2 (sampling theorem) × data length × number of bytes of the variable × 2 (real and imaginary parts because it is a complex number)

[0081] (B) In detecting insulation degradation, the frequency component with three times the electrical angle is used, and the highest frequency component among the abnormalities that can be diagnosed by the diagnostic equipment is used. The electrical angular frequency can be calculated by multiplying the compressor rotation speed by the number of pole pairs. Therefore, The frequency component to be detected = Maximum compressor rotation speed × Number of pole pairs × 3 This is the result.

[0082] Note that the number of pole pairs is the number of poles / 2.

[0083] (C) Most compressors currently on the market are controlled in units of approximately 0.1 rps, and an FFT resolution of 0.1 Hz is sufficient. The data length is 1 / FFT resolution, so it is set to 10 s.

[0084] (D) The variable must be of type float and should be 4 bytes.

[0085] (E) Applying (B) to (D) above to (A), First capacity = maximum compressor rotation speed × (number of poles / 2) × 3 × 2 × 10 × 4 × 2 Thus, equation 1 above is derived.

[0086] (3-5-3) In the diagnostic system 70 of this embodiment, due to Japanese regulations, the maximum inverter output frequency of the compressor 3 (maximum rotational speed of the compressor 3 × number of pole pairs) is slightly lower than 600 Hz, and the first capacity is often about 288 kilobytes. It is preferable to use a second memory 75b with a larger capacity than this first capacity, and in this embodiment, as described above, a memory with a capacity of 512 kilobytes or more is used as the second memory 75b.

[0087] Furthermore, the capacity of the conventional first memory 31b is smaller than the first capacity (approximately 288 kilobytes), and in this embodiment, it is 256 kilobytes or less.

[0088] (4) Variations (4-1) In the diagnostic system 70 described above, the second acquisition unit 72 is connected to the first circuit board 30 of the refrigeration cycle device 10 by a communication line 79. However, the second acquisition unit 72 and the first circuit board 30 may be equipped with wireless communication units, and the second acquisition unit 72 and the first circuit board 30 may be connected by short-range wireless communication. For the wireless communication unit on the first circuit board 30 side, the first circuit board 30 may be equipped with wireless communication functions such as Bluetooth® or Wi-Fi®, or a maintenance person may attach an external wireless communication device to the second connector 32b of the first circuit board 30.

[0089] (4-2) The diagnostic system 70 described above is equipped with a third data acquisition unit 73 to acquire information that can identify the number of poles of the compressor 3. The diagnostic processing unit 75 then determines the rotational speed of the compressor 3 based on the waveform data and the number of poles of the compressor 3.

[0090] Alternatively, instead of using the number of poles of the compressor 3, the rotational speed information of the compressor 3 may be directly obtained from the microcontroller 31. In this case, the diagnosis will no longer be based on the rotational speed of the compressor 3 calculated by the diagnostic processing unit 75, but the input of the number of poles will be eliminated.

[0091] (4-3) In the diagnostic system 70 described above, the maintenance person is instructed to input the number of poles of the compressor 3 using the touch panel 70a of the third acquisition unit 73. However, if the microcontroller 31's memory (first memory 31b, ROM, etc.) stores information regarding the number of poles, a different configuration may be adopted in which the number of poles of the compressor 3 is obtained from the microcontroller 31. For example, if the model information of the compressor 3 is stored in the microcontroller 31's memory, it can be obtained and the number of poles of the compressor 3 can be identified using a comparison table of model information and the number of poles on the diagnostic system 70 side.

[0092] (4-4) In the diagnostic system 70 described above, the current value is selected as the physical quantity obtained from the compressor 3, and the input current to the motor 3a of the compressor 3 is detected by clamp-type current sensors CT1 and CT2. However, it is also possible to select physical quantities such as voltage, sound, and vibration as the physical quantities obtained from the compressor 3. In this case, external sensors such as a voltage probe, microphone, AE (Acoustic Emission) sensor, acceleration pickup, and speed sensor would be used.

[0093] (4-5) In the diagnostic system 70 described above, control information INFO such as refrigerant temperature and pressure and ambient temperature is obtained from the first memory 31b of the microcontroller 31. Furthermore, if the refrigeration cycle device 10 stores the cumulative operating time in the memory (EEPROM, etc.) of the microcontroller 31, it is preferable for the diagnostic system 70 to also obtain this cumulative operating time information as one of the control information INFOs. If the cumulative operating time is known, the diagnostic system 70 can accurately estimate the deterioration rate and the timing of future failures based on the estimated deterioration degree of the compressor 3.

[0094] (4-6) In the diagnostic system 70 described above, control information INFO, including the refrigerant pressure (discharge pressure, suction pressure), is obtained from the first memory 31b of the microcontroller 31. Alternatively, during cooling operation, the temperature of the condenser 5 may be obtained as information correlated with the discharge pressure, and the temperature of the evaporator 7 as information correlated with the suction pressure. During heating operation, the temperature of the condenser 7 may be obtained as information correlated with the discharge pressure, and the temperature of the evaporator 5 as information correlated with the suction pressure. Furthermore, the control information INFO may be obtained with a certain coefficient applied (for example, treating 1.2 as 12).

[0095] (4-7) Diagnostic system related to modified example A Instead of the diagnostic system 70 shown in Figure 3, the configuration of the diagnostic system 170 shown in Figure 6A may be adopted. The diagnostic system 170 according to this modified example A consists of an information acquisition unit 170A having a first acquisition unit 171 and a second acquisition unit 172 corresponding to the first acquisition unit 71 and second acquisition unit 72 of the diagnostic system 70, and a notebook-type personal computer (hereinafter referred to as PC) 170B. The PC 170B has a second CPU 175a and a second memory 175b corresponding to the second CPU 75a and second memory 75b of the diagnostic system 70. The second CPU 175a has performance equal to or greater than that of the second CPU 75a. The second memory 175b has a capacity equal to or greater than that of the second memory 75b.

[0096] The maintenance personnel bring the information acquisition unit 170A and PC170B to the installation site of the refrigeration cycle device 10 to be diagnosed, and connect the information acquisition unit 170A to the refrigeration cycle device 10 using the electric wire 78, current sensors CT1 and CT2, and communication line 79 that they also brought with them. In addition, the information acquisition unit 170A and PC170B are connected by the communication line 170C.

[0097] The diagnostic system 170 shown in Figure 6A also has the same characteristics as the diagnostic system 70 described above, enabling highly accurate diagnosis of the compressor 3.

[0098] (4-8) Diagnostic system related to modified example B Instead of the diagnostic system 70 shown in Figure 3, the configuration of the diagnostic system 270 shown in Figure 6B may be adopted. The diagnostic system 270 according to this modified example B consists of an information acquisition unit 270A having a first acquisition unit 271 and a second acquisition unit 272 corresponding to the first acquisition unit 71 and second acquisition unit 72 of the diagnostic system 70, and a cloud computer 270B. The cloud computer 270B, which functions as a diagnostic processing unit, has a second CPU 275a and a second memory 275b corresponding to the second CPU 75a and second memory 75b of the diagnostic system 70. The second CPU 275a has performance equal to or greater than that of the second CPU 75a. The second memory 275b has a capacity equal to or greater than that of the second memory 75b. Furthermore, the information acquisition unit 270A has a processing unit 273. The processing unit 273 is a computer with performance and capacity equal to or greater than that of the second CPU 75a and second memory 75b of the diagnostic system 70. The processing unit 273 acquires waveform data, performs frequency calculations, and sends the calculation results and control information INFO to the cloud computer 270B. The cloud computer 270B performs a detailed diagnosis, and the diagnosis results are sent to the information acquisition unit 270A. Maintenance personnel can view the diagnosis results output on the display panel of the information acquisition unit 270A.

[0099] The maintenance personnel bring the information acquisition unit 270A to the installation site of the refrigeration cycle device 10 to be diagnosed, and connect the information acquisition unit 270A to the refrigeration cycle device 10 using the power lines 78, current sensors CT1 and CT2, A / D converter 271a, and communication line 79 that they also brought with them. The A / D converter 271a has performance equivalent to or better than the A / D converter 71a of the diagnostic system 70. The information acquisition unit 270A and the cloud computer 270B are connected via a public network 270C such as the internet.

[0100] The diagnostic system 270 shown in Figure 6B also has the same characteristics as the diagnostic system 70 described above, enabling highly accurate diagnosis of the compressor 3.

[0101] (4-9) In the refrigeration cycle device 10 described above, a second board 40, which is an inverter board, is mounted separately from the first board 30, but these functions may be integrated and mounted on a single board. In this case, a microcontroller that combines the functions of the first board 30 and the second board 40 may be implemented.

[0102] (4-10) While embodiments of this disclosure have been described above, it should be understood that various modifications to the form and details are possible without departing from the spirit and scope of this disclosure as described in the claims. [Explanation of symbols]

[0103] 1. Outdoor unit (heat source unit) 2. Indoor Unit (Usage Unit) 3. Compressor 10 Refrigeration cycle equipment 10a Refrigerant Circuit 30. First circuit board (printed circuit board) 31 Microcontroller (First communication unit, Second communication unit) 31b First memory 32a First connector (first communication section) 32b Second connector (second communication section) 70 Diagnostic Systems 71 First acquisition part 72 Second acquisition part 73 Third acquisition part 75 Diagnostic Processing Unit 75b Second Memory 76 Output section 78 Electric wire 79 Communication lines INFO Control Information 170 Diagnostic Systems 171 First acquisition part 172 Second acquisition part 270 Diagnostic Systems [Prior art documents] [Patent Documents]

[0104] [Patent Document 1] Japanese Patent Publication No. 2022-28644

Claims

1. A refrigeration cycle device (10) includes a refrigerant circuit (10a) including a compressor (3) and at least a microcontroller (31) that controls the compressor, wherein the microcontroller includes a first memory (31b). A diagnostic device (70) for diagnosing, A first acquisition unit (71) acquires waveform data of physical quantities obtained from the compressor, A second acquisition unit (72) acquires control information (INFO) of the refrigeration cycle device stored in the first memory, A diagnostic processing unit (75) diagnoses the compressor based on the waveform data acquired by the first acquisition unit and the control information acquired by the second acquisition unit, An output unit (76) that outputs the diagnostic results from the diagnostic processing unit, Sensors (CT1, CT2) that can be attached to the compressor of the refrigeration cycle, Equipped with, The diagnostic processing unit includes a second memory (75b), The second memory has a larger capacity than the first memory. The first acquisition unit acquires waveform data of the physical quantity from the sensors (CT1, CT2) via wired communication. Diagnostic equipment.

2. A refrigeration cycle device (10) includes a refrigerant circuit (10a) including a compressor (3) and at least a microcontroller (31) that controls the compressor, wherein the microcontroller includes a first memory (31b). A diagnostic system (70) for diagnosing, A first acquisition unit (71) acquires waveform data of physical quantities obtained from the compressor, A second acquisition unit (72) acquires control information (INFO) of the refrigeration cycle device stored in the first memory, A diagnostic processing unit (75) diagnoses the compressor based on the waveform data acquired by the first acquisition unit and the control information acquired by the second acquisition unit, An output unit (76) that outputs the diagnostic results from the diagnostic processing unit, Equipped with, The diagnostic processing unit includes a second memory (75b), The second memory has a larger capacity than the first memory. Diagnostic system.

3. The refrigeration cycle device further includes a printed circuit board (30) on which the microcontroller is mounted. The printed circuit board has a connector (32b) for attaching a wired communication line (79), or a communication unit for short-range wireless communication, The second acquisition unit acquires the control information by communicating bidirectionally with the microcontroller via the communication line or the short-range wireless communication. A diagnostic device according to claim 1, or a diagnostic system according to claim 2.

4. The refrigeration cycle device further includes a printed circuit board (30) on which the microcontroller is mounted. The printed circuit board has a connector (32b) for attaching a wired communication line (79), or a communication unit for short-range wireless communication, The second acquisition unit acquires the control information via the communication line or the short-range wireless communication. The second acquisition unit transmits the address of the first memory in which the control information is stored to the microcontroller. The microcontroller transmits the variable stored in the received address to the second acquisition unit. The second acquisition unit receives the variable, By doing so, the second acquisition unit acquires the control information. A diagnostic device according to claim 1, or a diagnostic system according to claim 2.

5. The aforementioned refrigeration cycle device (10) A heat source unit (1) housing the compressor (3) and the microcontroller (31), User unit (2), It further possesses, The aforementioned heat source unit is A first communication unit (31, 32a) for communicating with the aforementioned user unit, A second communication unit (31, 32b) for communicating with equipment other than the aforementioned refrigeration cycle device (10), It further includes, The second acquisition unit is connected to the second communication unit and acquires the control information from the first memory. A diagnostic device according to claim 1, or a diagnostic system according to claim 2.

6. The second acquisition unit performs bidirectional communication with the second communication unit when acquiring the control information from the first memory. The diagnostic device or diagnostic system according to claim 5.

7. In diagnosing the compressor, sensors (CT1, CT2) attached to the compressor, Furthermore, The first acquisition unit acquires waveform data of the physical quantity from the sensors (CT1, CT2) by wireless communication. The diagnostic system according to claim 2.

8. The capacity of the second memory is greater than or equal to the first capacity calculated by the following formula 1. The capacity of the first memory is smaller than the first capacity calculated by the following equation 1. Formula 1: First capacity (bytes) = Maximum rotational speed of the compressor (rpm) × Number of poles of the compressor × 240 A diagnostic device according to claim 1, or a diagnostic system according to claim 2.

9. The capacity of the second memory is 512 kilobytes or more. The capacity of the first memory is 256 kilobytes or less. A diagnostic device according to claim 1, or a diagnostic system according to claim 2.

10. The physical quantity obtained from the compressor is the current value of the compressor. A diagnostic device according to claim 1, or a diagnostic system according to claim 2.

11. The control information includes information correlated with at least one of the following: discharge pressure, which is the pressure of the refrigerant discharged from the compressor; suction pressure, which is the pressure of the refrigerant drawn into the compressor; and the rotational speed of the compressor. A diagnostic device according to claim 1, or a diagnostic system according to claim 2.

12. The diagnostic processing unit, in diagnosing the compressor, determines the rotational speed of the compressor based on the waveform data. A diagnostic device according to claim 1, or a diagnostic system according to claim 2.

13. A third acquisition unit (73) acquires information that can identify the number of poles of the compressor. Furthermore, The physical quantity obtained from the compressor is the current value or voltage value of the compressor. The diagnostic processing unit, in diagnosing the compressor, determines the rotational speed of the compressor based on the waveform data and the number of poles acquired by the third acquisition unit. The diagnostic device or diagnostic system according to claim 12.

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