Frequency converter deceleration overcurrent fault testing device

Abstract

The utility model discloses a frequency converter deceleration over-current fault testing device, which comprises a measuring mechanism. The measuring mechanism is driven by the rotating module and sequentially selects one resistor assembly to test the frequency converter, each resistor assembly has at least two different resistance values, and the resistor assemblies are electrically connected to the output end or the power supply end of the frequency converter; the resistor assembly is electrically connected with a universal meter; when the frequency converter is started, the universal meter detects different load conditions generated by the frequency converter on the resistor assembly and simulates the different load conditions. According to the technology of the utility model, the resistor assemblies with different resistance values are utilized to simulate various different load conditions, so that the performance of the frequency converter can be comprehensively tested, including the performance under low-load and high-load conditions. By monitoring the current value in real time, a highly accurate test result can be provided, and tiny current change can be detected, so that the accuracy of fault detection is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to frequency converter technical field especially relates to a frequency converter deceleration overcurrent fault testing device. BACKGROUND

[0002] A frequency converter, also known as a variable frequency drive or AC drive, is an electrical device used to control the speed and output power of an AC motor. It works by adjusting the input voltage and frequency, which can change the motor's running speed, so as to achieve precise speed regulation and energy-saving control. Frequency converters are commonly used in industrial applications, such as factory production lines, elevators, ventilation systems, pumping stations, etc., to improve efficiency, reduce energy consumption and prolong the life of the motor.

[0003] Basically, the frequency converter converts the input AC power into adjustable voltage and frequency output to meet the requirements of specific applications. The frequency converter in modern industry needs to detect the fault of overcurrent to ensure the reliability, efficiency and equipment protection of the production line. Through regular detection and maintenance, the risk of potential failure can be minimized.

[0004] "Variable frequency converter deceleration overcurrent" refers to a phenomenon that occurs when the current exceeds the rated current under normal operating conditions during the deceleration process of the motor controlled by the frequency converter. Usually, when the motor decelerates from high-speed operation to low-speed operation, the current will increase instantaneously due to the mechanical inertia of the motor. However, if the current exceeds the rated value of the motor or frequency converter, it may cause a series of problems, such as overheating of the motor, which may damage the winding insulation and reduce the service life of the motor. Or because the frequency converter may not be able to provide the required current, it will be overloaded, causing damage or triggering a fault. At the same time, deceleration overcurrent may cause distortion of the current waveform in the power grid, which may interfere with other electronic devices and systems.

[0005] During the production and assembly process of the frequency converter, there may be improper installation of components, welding problems, connection problems or other assembly errors. These problems may cause abnormal circuit, which may cause overcurrent failure during deceleration. By detecting the deceleration overcurrent problem, assembly quality problems can be found and corrected early, ensuring that the quality of each frequency converter meets the specifications, avoiding the flow of defective products into the market and causing hidden dangers.

[0006] Therefore, a frequency converter deceleration overcurrent fault testing device is proposed. UTILITY MODEL CONTENT

[0007] Therefore, the embodiment of the utility model hopes to provide a frequency converter deceleration overcurrent fault testing device to solve or alleviate the technical problems existing in the prior art, that is, during the production of the frequency converter, improper installation, welding problems, connection problems or other assembly errors may cause the circuit to be abnormal, thereby causing overcurrent failure during deceleration; by setting a detection post, performing corresponding detection work, ensuring that the quality of each frequency converter when it is offline meets the specifications, and at least providing one beneficial selection;

[0008] The technical scheme of the embodiment of the utility model is implemented as follows: a frequency converter deceleration overcurrent fault testing device, comprising a measurement mechanism; the measurement mechanism is driven by a rotating module and sequentially selects one resistance assembly to test the frequency converter, the resistance assembly has at least two different resistance values, and the resistance assembly is electrically connected to the output end or the power supply end of the frequency converter; the resistance assembly is electrically connected to a multimeter; when the frequency converter is started, the multimeter detects different load conditions generated by the resistance assembly and simulates different load conditions, and whether the deceleration overcurrent fault exists is judged by the value of current feedback to the multimeter.

[0009] In an embodiment, the measurement mechanism includes a nest frame, and the nest frame has a plurality of resistance assemblies arranged in a ring array in the interior of the nest frame, and each resistance assembly has a different resistance value, so as to provide a plurality of different load conditions for testing; and the nest frame is driven to rotate by a rotating module.

[0010] In the above embodiment, the working table is provided, so that the device can be conveniently integrated into the existing frequency converter production line as a detection process station to perform corresponding flow work detection.

[0011] In an embodiment, the measurement mechanism includes a nest frame, and the nest frame has a plurality of resistance assemblies arranged in a ring array in the interior of the nest frame, and each resistance assembly has a different resistance value, so as to provide a plurality of different load conditions for testing; and the nest frame is driven to rotate by a rotating module.

[0012] In the above embodiment, the measurement mechanism includes a nest frame, and the nest frame has a plurality of resistance assemblies arranged in a ring array in the interior of the nest frame, and each resistance assembly has a different resistance value, so as to provide a plurality of different load conditions for testing; and the nest frame is driven to rotate by a rotating module.

[0013] In an embodiment, the middle part of the nest frame is rotatably connected to a containing cylinder through a bearing, and the containing cylinder is provided with an electrode, and the electrode is magnetically attracted to and connected to the electrode of the resistance assembly at the lower position of the nest frame. The containing cylinder is used to place a cable, and the electrode is used to realize connection with a resistance assembly and corresponding testing and simulation with the frequency converter.

[0014] In the above embodiments: when working, the rotating module drives the nest frame to rotate uniformly by a certain angle, realizing the magnetic attraction connection between the electrodes of the resistance assembly and the electrodes of the containing cylinder. In addition, with the driving of the rotating module, the containing cylinder can be kept stationary through bearing rotation cooperation, avoiding wire winding.

[0015] In one embodiment, the first cable group is connected to the measuring mechanism, and the worker needs to manually connect the first cable group to the frequency converter when using.

[0016] In the above embodiments: the first cable group extends the measuring mechanism, and the worker needs to manually connect the first cable group to the frequency converter when using.

[0017] In one embodiment, the resistance assembly includes a housing and two resistors with different resistance values installed in the housing.

[0018] In one embodiment, the measuring mechanism includes a fork and a motor installed in the fork, the motor drives the nest frame through a hollow shaft, the hollow shaft is fixed to the output shaft of the fork and the motor, and the internal hollow part is rotationally connected to the containing cylinder through a bearing.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] (1) Diversity and comprehensiveness: this technology of the utility model uses resistance assemblies with different resistance values to simulate various load conditions, so that the performance of the frequency converter can be comprehensively tested, including performance under low load and high load. By monitoring the current value in real time, highly accurate test results can be provided, and small current changes can be detected, thereby improving the accuracy of fault detection.

[0021] (2) Real-time feedback: since the test is performed in real time, problems can be detected immediately when the frequency converter starts, which helps to detect potential deceleration overcurrent faults early and reduces the risk of faults in production.

[0022] (3) Flexibility: by automatically changing the resistance assemblies with different resistance values, the utility model can adapt to different frequency converter models and configurations, providing flexibility in testing. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0024] Figure 1 It is another perspective view of the present application;

[0025] Figure 2 It is another perspective view of the present application;

[0026] Figure 3 It is a perspective view of the measuring mechanism of the present application;

[0027] Figure 4 It is a perspective view of the measuring mechanism of the present application;

[0028] Figure 5 It is a perspective view of the resistance assembly and the containing cylinder of the present application;

[0029] Figure 6 It is a perspective view of the nest frame and the resistance assembly of the present application.

[0030] Reference signs: 1, workbench; 2, measuring mechanism; 201, fork frame; 202, motor; 203, hollow shaft; 204, nest frame; 205, resistance assembly; 206, containing cylinder; 207, electrode; 3, multimeter; 4, motor chuck; 5, first cable group; 6, second cable group; DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, therefore the present application is not limited to the specific embodiments disclosed below;

[0032] EMBODIMENT

[0033] Please refer to Figures 1-6The specific embodiment will provide a variable frequency drive deceleration overcurrent fault testing device, comprising a measuring mechanism 2; the measuring mechanism 2 is driven by a rotating module and selects an electric resistance assembly 205 to test the variable frequency drive in turn, the electric resistance assembly 205 has at least two different resistance values, and the electric resistance assembly 205 is electrically connected to the output end or the power supply end of the variable frequency drive; the electric resistance assembly 205 is electrically connected to an ohmmeter 3; when the variable frequency drive is started, the ohmmeter 3 detects different load conditions generated by the electric resistance assembly 205 and judges whether there is a deceleration overcurrent fault by simulating different load conditions and the value of current feedback to the ohmmeter 3.

[0034] Specifically: the principle of this testing device is to simulate different load conditions by changing the resistance value of the electric resistance assembly 205, thereby causing the change of current. When the variable frequency drive is started and runs under different loads, the resistance value of the electric resistance assembly 205 will affect the current of the circuit. The change of current will be fed back to the connected ohmmeter 3 in the circuit. If the variable frequency drive generates excessive current during deceleration, which will exceed the rated current under normal operating conditions, the ohmmeter 3 will record this situation and the staff will judge that there is a deceleration overcurrent fault.

[0035] It can be understood that in the specific embodiment: during testing, the variable frequency drive needs to be connected to the mains and the voltage needs to be constant.

[0036] It can be understood that in the specific embodiment: the function of this device is to test the deceleration overcurrent fault of the variable frequency drive. Through the rotating module, different electric resistance assemblies 205 are connected to the output end or the power supply end of the variable frequency drive in turn to simulate different load conditions. When the variable frequency drive is started, the ohmmeter 3 will monitor the change of current and record and analyze the values of these changes. If the current exceeds the specified range during deceleration, the device will judge that there is a deceleration overcurrent fault. This helps to find and repair potential problems in advance and ensures the reliability of the variable frequency drive in normal operation and on the production line. This device provides an automated and efficient fault detection method for the production line, which helps to improve product quality and production efficiency.

[0037] Specifically, the device further comprises a controller for connecting and controlling all electrical components of the device according to the pre-set program as the preset value and driving mode; it should be noted that the driving mode corresponds to the start-stop time interval, speed, power and other output parameters between the related electrical components in the following, that is, it meets the needs of the related electrical components driving the related mechanical devices to operate according to the described functions.

[0038] Preferably, the controller is further configured with a wireless transmitting module and a wireless receiving module, the wireless transmitting module sends the working or pausing instruction signal to the wireless receiving module via the medium; if necessary, the staff can input the instruction to the wireless transceiver module through the background wireless remote control device to remotely control the controller, and further remotely control all electrical elements of the device to drive according to the relevant driving mode; at the same time, the wireless transceiver module can also transmit the relevant coefficients or other information detected by the relevant sensing elements or servo driving elements in the device to the staff in the background.

[0039] In some embodiments of the present application, please refer to Figures 2-6 : further comprising a workbench 1, the workbench 1 is installed with a measuring mechanism 2, and is further installed with an electric chuck 4 for clamping the frequency converter.

[0040] In the present solution: the arrangement of the workbench 1 makes the device can be easily integrated into the existing frequency converter production line as a detection process station to perform the corresponding flow detection work.

[0041] Specifically: the addition of the workbench 1 makes the device easier to integrate into the production line. The frequency converter can be safely clamped on the electric chuck 4, and then the measuring mechanism 2 can perform the test. By rotating the module to select different resistance components 205, each component has a different resistance value to simulate different load conditions. When the frequency converter is clamped on the workbench 1 and started, the multimeter 3 will monitor the change of current in order to detect the deceleration overcurrent fault.

[0042] It can be understood that in the present embodiment: the addition of the workbench 1 provides a convenient way to integrate the device into the frequency converter production line. The electric chuck 4 on the workbench 1 allows workers to easily clamp the frequency converter in the test device. This makes each frequency converter can be tested on the production line without additional manual operation. This improves production efficiency and consistency. The entire device becomes a detection process station in the production process, which can perform corresponding detection work on the production line. This helps to ensure that each frequency converter has undergone quality detection, reduces the risk of quality problems on the production line, and improves product quality and reliability. The addition of the workbench 1 plays a key role in the frequency converter production process to ensure that the quality of the product meets the specifications.

[0043] In some embodiments of the present application, please refer to Figures 2-6 : the measuring mechanism 2 includes a nest frame 204, the inside of the nest frame 204 is uniformly arranged with a plurality of resistance components 205 in a ring array, and each resistance component 205 has a different resistance value, which is to provide a variety of different load condition tests; the nest frame 204 is driven to rotate by a rotating module.

[0044] In this embodiment, the testing mechanism 2 includes a nest frame, which is internally arranged with a plurality of resistance components 205 in a circular array. Each resistance component 205 has a different resistance value, which is designed to provide a variety of different load conditions for testing. The nest frame is driven by a rotating module, so that different resistance components 205 can be selected and connected to the frequency converter in turn for testing.

[0045] Specifically, the circular array inside the nest frame is installed with a plurality of resistance components 205, each of which has a different resistance value. This design allows different load conditions to be simulated during testing, as different resistance values will result in different currents. The rotating module is used to select and connect these resistance components 205, so that they are connected to the frequency converter in turn. When the frequency converter is started, the switching of the resistance components 205 and the measurement of the current will help detect the deceleration overcurrent fault.

[0046] It can be understood that in this specific embodiment, this implementation provides a method of simulating a variety of load conditions through the plurality of resistance components 205 inside the nest frame and the rotating module. This helps to more comprehensively test the performance of the frequency converter, as different resistance components 205 will result in different current responses. Through the driving of the rotating module, different resistance components 205 can be selected in turn, so that a variety of different load conditions are covered in a smooth testing process. This increases the level of detail of the test, which helps to more accurately detect the deceleration overcurrent fault. This implementation provides comprehensive testing while also improving testing efficiency, ensuring the quality and reliability of the product.

[0047] In some embodiments of the present application, please refer to Figures 2-6 : The middle part of the nest frame 204 is rotatably connected to a containing cylinder 206 through a bearing, and the containing cylinder 206 is provided with an electrode 207 that is magnetically attracted to the electrode 207 of the resistance component 205 at the lower position of the nest frame 204 and is connected in parallel. The containing cylinder 206 serves to place the cable and achieve communication with a resistance component 205 through the electrode 207, and corresponding testing and simulation with the frequency converter.

[0048] In this embodiment, when in operation, the rotating module drives the nest frame 204 to rotate uniformly by a certain angle, so that the electrode 207 of a resistance component 205 is magnetically attracted and connected to the electrode 207 of the containing cylinder 206. In addition, with the driving of the rotating module, the containing cylinder 206 can remain stationary through the bearing rotation fit, avoiding wire entanglement.

[0049] Specifically, this embodiment uses the accommodation cylinder 206 and the electrode 207 to manage the connection of the resistance assembly 205. The accommodation cylinder 206 places the cable and establishes a connection with the resistance assembly 205 through the electrode 207. The magnetic attraction of the electrode 207 allows the electrode 207 of the resistance assembly 205 to be conveniently connected with the electrode 207 of the accommodation cylinder 206 to complete the corresponding test. At the same time, the rotation module ensures the sequential connection of the resistance assembly 205 and realizes the switching of the connection by driving the uniform rotation of the nest frame 204.

[0050] It can be understood that in this specific embodiment: the design of this embodiment helps to more conveniently manage the connection of the resistance assembly 205, while avoiding the problem of wire winding. The accommodation cylinder 206 provides a space for the placement of the cable, while the electrode 207 is used to connect the resistance assembly 205. The magnetic attraction of the electrode 207 makes the connection process more convenient. Through the operation of the rotation module, the nest frame 204 can complete the uniform rotation and connection switching of the resistance assembly 205, ensuring the smooth progress of the test. The design of this embodiment helps to improve the operability and stability of the test device, ensuring the accuracy and consistency of the test.

[0051] In some specific embodiments of the present application, please refer to Figures 2-6 : The first cable group 5 and the second cable group 6 are placed in the accommodation cylinder 206, and the second cable group 6 is electrically connected with the multimeter 3 and the electrode 207 of the resistance assembly 205. Each resistance assembly 205 is electrically connected with a first cable group 5. The first cable group 5 is extended to the measuring mechanism 2, and the staff needs to manually connect the first cable group 5 to the frequency converter when using.

[0052] In this scheme: the first cable group 5 is extended to the measuring mechanism 2, and the staff needs to manually connect the first cable group 5 to the frequency converter when using.

[0053] Specifically: the accommodation cylinder 206 internally accommodates two cable groups, the first cable group 5 and the second cable group 6. The second cable group 6 is used to connect the multimeter 3 and the electrode 207 of the resistance assembly 205 to realize current measurement and testing. Each resistance assembly 205 is electrically connected with the first cable group 5, which is to guide the current and control the connection. When the staff needs to test, they must manually connect the first cable group 5 to the frequency converter to establish the required circuit connection.

[0054] It can be understood that in the present embodiment: the manual connection process of the first cable set 5 in this embodiment is to ensure the accuracy and safety of the test device. The staff needs to manually connect the cables to the frequency converter as needed to establish the required circuit. This manual connection process can be adjusted and replaced according to different test requirements. Through the guidance of the first cable set 5, the current can accurately flow through the resistance assembly 205 and be transmitted to the multimeter 3 through the second cable set 6, thereby conducting the deceleration overcurrent fault test. This embodiment provides greater flexibility to adapt to different test scenarios and frequency converter configurations. At the same time, manual connection ensures the controllability and accuracy of the test.

[0055] In some embodiments of the present application, please refer to Figures 2-6 : The resistance assembly 205 includes a housing and two resistors of different resistance values installed in the housing.

[0056] Specifically: the resistance assembly 205 in this embodiment is a device containing two resistors of different resistance values. These two resistors are installed in the housing and can be used to simulate different resistance conditions. By selecting different resistors, different current responses in the circuit can be caused to simulate different load conditions. This is to ensure that the test can cover a variety of different situations to detect deceleration overcurrent faults.

[0057] Further, different resistors of different resistance values are used to simulate different loads, and then the current passing through these resistors is measured to detect the deceleration overcurrent fault of the frequency converter. The principle of this method is based on Ohm's law and the basic principle of current measurement. In the fault test, two resistors of different resistance values are selected, a high load resistor and a low load resistor. When these resistors are connected to the power circuit of the frequency converter, they simulate different load conditions. The high resistance resistor will cause a smaller current in the circuit, and the low resistance resistor will cause a larger current in the circuit. This is because according to Ohm's law, the current is inversely proportional to the resistance. By measuring the current using the multimeter 3, the current value passing through the circuit can be determined. If the frequency converter is working normally, the current value should be within its specified range. If the measured current value significantly exceeds the specified range, it may indicate the presence of a deceleration overcurrent fault, because under normal circumstances, even different electrical loads should result in different current values, but they should all be within the acceptable range.

[0058] Further, when used, the positions where the high load resistor and the low load resistor are connected to the frequency converter will depend on the specific test requirements and the design of the frequency converter. In the basic case, these resistors will be connected to the output end or the power end of the frequency converter to simulate different load conditions:

[0059] (1) Scheme One: Connected to the output end:

[0060] High Load Resistance: Connected to the output of the inverter, usually the output terminals of the inverter or the motor terminals, to simulate a high load condition. This increases the load and results in a higher current.

[0061] Low Load Resistance: Connected to the output of the inverter or the motor terminals to simulate a low load condition. This decreases the load and results in a lower current.

[0062] (2) Scheme Two: Connected to the Power Supply Side:

[0063] High Load Resistance: Connected to the power input of the inverter, usually the power switch or the power input terminals of the inverter, to simulate a high load condition. This increases the current consumption.

[0064] Low Load Resistance: Also connected to the power input to simulate a low load condition. This decreases the current consumption.

[0065] Further, the current measurement leads of the multimeter 3 need to be connected to the simulated circuit to measure the current through the resistors:

[0066] (1) Scheme One: Connected to the Power Supply Side: If the high load resistance or low load resistance is connected to the power input of the inverter, i.e., the power side, then the current measurement leads of the multimeter 3 should be connected to the corresponding resistance terminals. The specific operation is as follows:

[0067] High Load Resistance: Connect the red (positive) current measurement lead of the multimeter 3 to one end of the high load resistance, and then connect the black (negative) current measurement lead to the corresponding position on the power side (power input of the inverter).

[0068] Low Load Resistance: Similarly, connect the red current measurement lead of the multimeter 3 to one end of the low load resistance, and then connect the black current measurement lead to the corresponding position on the power side.

[0069] (1) Scheme Two: Connected to the Output Side: If the high load resistance or low load resistance is connected to the output of the inverter or the motor terminals, then the current measurement leads of the multimeter 3 should be connected to the corresponding resistance terminals. The specific operation is as follows:

[0070] High Load Resistance: Connect the red current measurement lead of the multimeter 3 to one end of the high load resistance, and then connect the black current measurement lead to the corresponding position on the output side.

[0071] Low Load Resistance: Similarly, connect the red current measurement lead of the multimeter 3 to one end of the low load resistance, and then connect the black current measurement lead to the corresponding position on the output side.

[0072] Further, the device provided by the embodiment serves as a basis for "judging the fault" in that the detection device can judge whether the deceleration overcurrent fault exists by comparing the measured current value with the predetermined current threshold. Because under normal working conditions, the current of the frequency converter should be within a certain range, and the deceleration overcurrent fault usually manifests as an abnormal increase in current. By setting an appropriate current threshold in advance, the detection device can regard the current within this range as normal, and regard the current exceeding the threshold as abnormal. When the frequency converter has a deceleration overcurrent fault, it is usually caused by some circuit problem or abnormal motor load. These problems will cause the current to rise, because the relationship between current, voltage and resistance is Ohm's law. Therefore, the fault will cause the resistance to decrease or the voltage to rise, thereby causing the current to increase. It is also because of this characteristic that the device can achieve the fault finding and determination and finding.

[0073] It can be understood that in the specific embodiment, the resistance assembly 205 in this embodiment provides flexibility and diversity to simulate different load conditions. By having two resistors with different resistance values, the test device can more comprehensively test the performance of the frequency converter. When different resistors are selected, different working conditions can be simulated, ensuring that the coverage of the test is wider, which helps to more accurately detect the deceleration overcurrent fault. The design of this embodiment helps to improve the flexibility and adaptability of the test to adapt to different test requirements and frequency converter configurations.

[0074] In some specific embodiments of the present application, please refer to Figures 2-6 : The measuring mechanism 2 includes a fork frame 201 and a motor 202 installed in the fork frame 201, the motor 202 drives a nest frame 204 through a hollow shaft 203, the hollow shaft 203 is fixed to the output shaft of the fork frame 201 and the motor 202, and the internal hollow part thereof is rotatably connected with a containing cylinder 206 through a bearing.

[0075] Specifically, the motor 202 drives the nest frame 204 through its output shaft, and transmits torque through the hollow shaft 203. The hollow shaft 203 is fixed on the fork frame 201, and at the same time connects the internal hollow part of the containing cylinder 206 through a bearing. This allows the containing cylinder 206 to remain relatively stationary, while the rotation of the motor 202 drives the nest frame 204 to select the resistance assembly 205. The design of this mechanism allows the rotation of the nest frame 204 to achieve the selection and connection of different resistance assemblies 205, while avoiding the rotation of the containing cylinder 206.

[0076] It can be understood that in the present embodiment: the motor and bearing system in this embodiment provides control of mechanical movement to ensure that the nest frame 204 can rotate evenly and select different resistance components 205. The output shaft of the motor 202 transmits torque through the hollow shaft 203 to achieve the rotation of the nest frame. Similarly, through the bearings inside the hollow shaft 203, the containment cylinder 206 can remain relatively stationary and will not move with the rotation of the nest frame. This design helps to ensure the accurate selection and connection of the resistance components 205, so that the test can be effectively carried out. This embodiment improves the stability and controllability of the test device, ensuring the accuracy of the test.

[0077] In summary, to address the problems in the prior art, the present embodiment is based on the above-mentioned variable frequency reducer over-current fault test device, which uses the following technical means or features to solve the problem: The core principle of this device is to test the variable frequency reducer by simulating different load conditions. It uses multiple resistance components 205, each with a different resistance value to simulate different load conditions. These resistance components 205 are sequentially selected and connected to the variable frequency reducer through a rotating module, so that when the variable frequency reducer starts, the change in current can be fed back to the connected multimeter 3 in the circuit. By comparing the measured current value with the predetermined current threshold (which needs to be set according to different variable frequency reducer models), the detection device can determine whether there is an over-current fault. This device actually tests the performance of the variable frequency reducer by simulating different load conditions, ensuring that it can operate normally under various working conditions. If the current exceeds the specified range, the staff needs to record this situation to determine that there is an over-current fault, and then take appropriate measures.

[0078] The test device provided by the present embodiment provides a semi-automatic test method, which can test each variable frequency reducer on the production line to ensure that the product quality meets the specifications. This is achieved by setting up a detection post to ensure that each variable frequency reducer is subjected to quality detection before it is taken off the line.

[0079] The above-described embodiments only express the actual application of the present application, which is described in detail and specifically, but it should not be interpreted as a limitation on the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A frequency inverter reduced speed over current fault testing device, characterized by, The measuring mechanism (2) is driven by a rotating module and selects an electric resistance component (205) in turn to test the frequency converter, the electric resistance component (205) has at least two different resistance values, and the electric resistance component (205) is electrically connected to the output end or the power supply end of the frequency converter. The electric resistance component (205) is electrically connected to a multimeter (3), when the frequency converter is started, the multimeter (3) detects different load conditions generated by the electric resistance component (205) of the frequency converter and judges whether there is a deceleration overcurrent fault by simulating different load conditions and the value of current feedback to the multimeter (3). The workbench (1) is also provided with an electric chuck (4) for clamping the frequency converter.

2. The variable frequency drive reduced speed over current fault testing device of claim 1, wherein: The measuring mechanism (2) comprises a nest frame (204), a plurality of electric resistance components (205) are uniformly arranged in a ring array in the nest frame (204), and the resistance values of the electric resistance components (205) are different.

3. The variable frequency drive reduced speed over current fault testing device of claim 1, wherein: The nest frame (204) is driven to rotate by a rotating module. The middle part of the nest frame (204) is rotatably connected to a containing cylinder (206) through a bearing, the containing cylinder (206) is provided with an electrode (207), the electrode (207) is magnetically attracted to the electrode (207) of the electric resistance component (205) at the lower position of the nest frame (204) and is connected.

4. The variable frequency drive reduced speed over current fault testing device of claim 3, wherein: The first cable group (5) and the second cable group (6) are placed in the containing cylinder (206), the second cable group (6) is electrically connected to the multimeter (3) and the electrode (207) of the electric resistance component (205), and each electric resistance component (205) is electrically connected to a first cable group (5).

5. The variable frequency drive reduced speed over current fault testing device of claim 4, wherein: The electric resistance component (205) comprises a shell and two electric resistors with different resistance values installed in the shell.

6. The frequency inverter reduced speed over current fault testing device of any one of claims 1-5, wherein: The measuring mechanism (2) comprises a fork frame (201) and a motor (202) installed in the fork frame (201), the motor (202) drives the nest frame (204) through a hollow shaft (203), the hollow shaft (203) is fixed to the output shaft of the fork frame (201) and the motor (202), and the hollow part of the hollow shaft (203) is rotatably connected to the containing cylinder (206) through a bearing.

7. The frequency inverter reduced speed over current fault testing apparatus of claim 4, wherein: ​

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