Test board for output short-circuit protection of frequency converter
By designing a simplified inverter output short-circuit protection test bench, and utilizing power supply, motor, and switching components, fast and low-cost short-circuit testing is achieved, solving the problems of cumbersome and costly testing in existing technologies and improving testing efficiency.
Patent Information
- Application Number
- CN202422973037.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-03
AI Technical Summary
Existing inverter test benches are cumbersome, costly, and have long testing cycles, and cannot effectively prevent damage caused by short circuits on the inverter output side.
A simple inverter output short-circuit protection test bench was designed, which includes a power supply, motor, switch assembly and inverter mounting plate. Different short-circuit tests can be achieved through simple switch assembly, including UVW short-circuit group, UV short-circuit group, UW short-circuit group, VW short-circuit group and UVW simultaneous short-circuit group, which simplifies the test process.
It achieves simplicity and speed in inverter output short-circuit protection testing, reduces testing costs and time, and improves testing efficiency.
Smart Images
Figure CN223597864U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a test board, specifically is a test board of frequency converter output short circuit protection. BACKGROUND
[0002] The frequency converter needs to carry out short circuit test when leaving factory, prevents appearing damage.
[0003] Because the frequency converter often appears load failure to cause the frequency converter output side short circuit condition when using, very easy to damage the frequency converter internal device, the test board of current frequency converter is more cumbersome, not simple, needs to test current, uses oscilloscope and so on device, cost is high, and the period is long. UTILITY MODEL CONTENTS
[0004] In order to solve the above-mentioned prior art defects, the utility model provides a test board of frequency converter output short circuit protection, the utility model test board is more simple, convenient to use, and fast test.
[0005] In order to realize the above-mentioned technical purpose, the utility model adopts following technical scheme: a test board of frequency converter output short circuit protection, including test board, the test board is fixed with power, motor, switch group and frequency converter mounting plate, the frequency converter mounting plate is used to install the frequency converter to be tested, three power lines L1, L2, L3 of the power are connected with the R pin, S pin, T pin of the frequency converter to be tested respectively, and the ground pin of the frequency converter to be tested is grounded, three connection lines of the motor are connected with the U pin, V pin, W pin of the frequency converter to be tested respectively,
[0006] The switch group includes UVW respectively short circuit group, UV short circuit group, UW short circuit group, VW short circuit group, UVW simultaneous short circuit group.
[0007] Further, the UVW respectively short circuit group includes single switch QF1, single switch QF2, single switch QF3, one end of single switch QF1 is connected to the U pin of the frequency converter to be tested, the other end is grounded, one end of single switch QF2 is connected to the V pin of the frequency converter to be tested, the other end is grounded, one end of single switch QF3 is connected to the W pin of the frequency converter to be tested, the other end is grounded.
[0008] Further, the UV short circuit group includes single switch QF4, one end of single switch QF4 is connected to the U pin of the frequency converter to be tested, the other end is connected to the V pin of the frequency converter to be tested.
[0009] Further, the UW short circuit group includes single switch QF5, one end of single switch QF5 is connected to the U pin of the frequency converter to be tested, the other end is connected to the W pin of the frequency converter to be tested.
[0010] Further, the VW short circuit group comprises a single switch QF6, one end of the single switch QF6 is connected to the V pin of the variable frequency converter to be tested, and the other end is connected to the W pin of the variable frequency converter to be tested.
[0011] Further, the UVW simultaneous short circuit group comprises a three-switch KM1, three switch pins of the three-switch KM1 are connected to the U pin, the V pin and the W pin of the variable frequency converter to be tested respectively, and the other ends of the three switch pins are connected to each other.
[0012] Further, a push button switch SB is further included, and two ends of the push button switch SB are connected to the power supply lines L1 and L2 respectively.
[0013] Further, the test bench plate is provided with a plurality of mounting holes for fixing mounting plates, the mounting plates comprise the variable frequency converter mounting plate, the power supply mounting plate, the motor mounting plate and the switch mounting plate, the power supply is mounted on the power supply mounting plate, the motor is mounted on the motor mounting plate, and the switch group is mounted on the switch mounting plate.
[0014] In conclusion, the utility model achieves the following technical effects:
[0015] The utility model sets up a test bench and fixes mounting plates thereon, is used for fixing power supply, indicator light, motor and various switches in advance, fixing the variable frequency converter to be tested on the mounting plate and connecting with electric wires, and pressing corresponding switches can realize different short circuit tests;
[0016] The utility model has simple structure, is convenient to use and short in test period. DRAWINGS
[0017] Figure 1 It is a kind of variable frequency converter output short circuit protection test bench;
[0018] Figure 2 It is test bench connection schematic diagram. CONCRETE EMBODIMENT
[0019] The utility model will be further explained in detail in combination with drawings.
[0020] The embodiment is only the explanation of the utility model, and it is not the limitation of the utility model, and the person skilled in the art can make the modification without creative contribution according to the need after reading the present specification, but as long as in the utility model's right claim range is protected by patent law.
[0021] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.
[0022] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0023] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0024] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0025] Embodiment:
[0026] Figure 1The utility model provides a kind of test bench of frequency converter output short circuit protection, including test bench plate 1, the power supply 2, motor 4, switch group and frequency converter mounting plate 13 are fixed, the frequency converter mounting plate 13 is used to install the frequency converter to be tested;The test bench plate 1 is opened with multiple mounting holes 11 for fixed mounting plate, the mounting plate includes the frequency converter mounting plate 13, power supply mounting plate 12, motor mounting plate 14, switch mounting plate 15, the power supply 2 is installed on the power supply mounting plate 12, the motor 4 is installed on the motor mounting plate 14, the switch group is installed on the switch mounting plate 15.Utilize bolt to fix all mounting plate, then power supply 2, motor 4, switch group and frequency converter mounting plate 13 are fixed on corresponding mounting plate.
[0027] Figure 2 It is test bench wiring schematic diagram, the three power supply lines L1, L2, L3 of the power supply 2 are connected with the R pin, S pin, T pin of the frequency converter to be tested 3 respectively, and the ground pin of the frequency converter to be tested 3 is grounded;The three connection lines of the motor 4 are connected with the U pin, V pin, W pin of the frequency converter to be tested 3 respectively to form main circuit.
[0028] The switch group includes UVW respectively short circuit group, UV short circuit group, UW short circuit group, VW short circuit group, UVW simultaneous short circuit group.
[0029] The UVW respectively short circuit group includes single switch QF1, single switch QF2, single switch QF3;One end of single switch QF1 is connected to the U pin of the frequency converter to be tested, and the other end is grounded, one end of single switch QF2 is connected to the V pin of the frequency converter to be tested, and the other end is grounded, one end of single switch QF3 is connected to the W pin of the frequency converter to be tested, and the other end is grounded.
[0030] Only close single switch QF1, short circuit between U pin and ground wire, test the single short circuit of U pin.Only close single switch QF2, short circuit between V pin and ground wire, test the single short circuit of V pin.Only close single switch QF3, short circuit between W pin and ground wire, test the single short circuit of W pin.
[0031] The UV short circuit group includes single switch QF4, one end of single switch QF4 is connected to the U pin of the frequency converter to be tested, and the other end is connected to the V pin of the frequency converter to be tested.Only close single switch QF4, short circuit between U pin and V pin, test the short circuit between U pin and V pin.
[0032] The UW short circuit group includes single switch QF5, one end of single switch QF5 is connected to the U pin of the frequency converter to be tested, and the other end is connected to the W pin of the frequency converter to be tested.Only close single switch QF5, short circuit between U pin and W pin, test the short circuit between U pin and W pin.
[0033] The VW short circuit group comprises a single switch QF6, one end of the single switch QF6 is connected to the V pin of the frequency converter to be tested, and the other end is connected to the W pin of the frequency converter to be tested. Only the single switch QF6 is closed, the V pin and the W pin are short-circuited, and the short circuit between the V pin and the W pin is tested.
[0034] The UVW simultaneous short circuit group comprises a three-switch KM1, three switch pins of the three-switch KM1 are connected to the U pin, the V pin and the W pin of the frequency converter to be tested at one end, and the three switch pins are connected to each other at the other end. The three switch pins are closed at the same time, and the U pin, the V pin and the W pin are tested for simultaneous short circuit.
[0035] The button switch SB is further included, and two ends of the button switch SB are connected to the power supply lines L1 and L2 respectively.
[0036] The indicator lamp 5 is further included, one end of the indicator lamp 5 is connected to L1, and the other end is connected to L2, and the indicator lamp 5 is used for power supply indication.
[0037] The L1, the L2 and the L3 are further provided with total switches respectively, and the total switches are used for power-on and power-off.
[0038] The single switch QF1, the single switch QF2, the single switch QF3, the single switch QF4, the single switch QF5 and the single switch QF6 are air relays, and the three-switch KM1 is a contactor.
[0039] Working principle:
[0040] The total switches of the L1, the L2 and the L3 are turned off, the frequency converter to be tested 3 is installed on the frequency converter mounting plate 13, and the connection is completed by wires.
[0041] The single switch QF1, the single switch QF2, the single switch QF3, the single switch QF4, the single switch QF5, the single switch QF6 and the three-switch KM1 are closed respectively, so as to detect the corresponding functions.
[0042] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form, and any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments are within the scope of the technical scheme of the present application.
Claims
1. A test bench for variable frequency drive output short circuit protection, characterized in that: The utility model provides a test platform, including test platform (1), the test platform (1) is fixed with power (2), motor (4), switch group and frequency converter mounting plate (13) for installing the frequency converter to be tested, three power lines L1, L2, L3 of power (2) are connected with R pin, S pin, T pin of the frequency converter to be tested respectively, and the ground pin of the frequency converter to be tested is grounded, three connecting lines of motor (4) are connected with U pin, V pin, W pin of the frequency converter to be tested respectively, The switch group includes UVW respectively short circuit group, UV short circuit group, UW short circuit group, VW short circuit group, UVW simultaneous short circuit group.
2. The test bench for output short-circuit protection of a frequency converter according to claim 1, characterized in that: The UVW respectively short circuit group includes single switch QF1, single switch QF2, single switch QF3; one end of single switch QF1 is connected to U pin of the frequency converter to be tested, and the other end is grounded, one end of single switch QF2 is connected to V pin of the frequency converter to be tested, and the other end is grounded, one end of single switch QF3 is connected to W pin of the frequency converter to be tested, and the other end is grounded.
3. The test bench for output short-circuit protection of a frequency converter according to claim 1, characterized in that: The UV short circuit group includes single switch QF4, and one end of single switch QF4 is connected to U pin of the frequency converter to be tested, and the other end is connected to V pin of the frequency converter to be tested.
4. The test bench for output short-circuit protection of a frequency converter according to claim 1, characterized in that: The UW short circuit group includes single switch QF5, and one end of single switch QF5 is connected to U pin of the frequency converter to be tested, and the other end is connected to W pin of the frequency converter to be tested.
5. The test bench for output short-circuit protection of a frequency converter according to claim 1, characterized in that: The VW short circuit group includes single switch QF6, and one end of single switch QF6 is connected to V pin of the frequency converter to be tested, and the other end is connected to W pin of the frequency converter to be tested.
6. The test bench for output short-circuit protection of a frequency converter according to claim 1, characterized in that: The UVW simultaneous short circuit group includes three switches KM1, and three switch pins of three switches KM1 are connected to U pin, V pin, W pin of the frequency converter to be tested respectively, and the other ends of three switch pins are connected to each other.
7. The test bench for output short-circuit protection of a frequency converter according to claim 1, characterized in that: It also includes button switch SB, and two ends of button switch SB are connected to power lines L1 and L2 respectively.
8. The test bench for output short-circuit protection of a frequency converter according to claim 1, characterized in that: The test platform (1) is provided with a plurality of mounting holes (11) for fixing mounting plate, and the mounting plate includes the frequency converter mounting plate (13), power mounting plate (12), motor mounting plate (14) and switch mounting plate (15), the power (2) is installed on the power mounting plate (12), the motor (4) is installed on the motor mounting plate (14), and the switch group is installed on the switch mounting plate (15).