CN220357177U - Variable load device for diagnosis of low-voltage frequency converter - Google Patents
Variable load device for diagnosis of low-voltage frequency converter Download PDFInfo
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- CN220357177U CN220357177U CN202321771735.5U CN202321771735U CN220357177U CN 220357177 U CN220357177 U CN 220357177U CN 202321771735 U CN202321771735 U CN 202321771735U CN 220357177 U CN220357177 U CN 220357177U
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000012423 maintenance Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 11
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 6
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model discloses a variable load device for diagnosing a low-voltage frequency converter, which comprises three alternating-current contactors and three resistor groups, wherein the output ends of the three alternating-current contactors are respectively connected with the corresponding resistor groups, the three alternating-current contactors are connected in parallel and then are connected with the output ends of the diagnosed low-voltage frequency converter, so as to provide variable load for the diagnosed low-voltage frequency converter, the input ends of the diagnosed low-voltage frequency converter are connected with a three-phase alternating-current 380V detection power supply, the variable load device relates to the technical field of low-voltage frequency converter detection and diagnosis application, the three-phase output ends of the low-voltage frequency converter are connected in the maintenance process of the low-voltage frequency converter and serve as the load of the low-voltage frequency converter, the input of the frequency converter and the resistor groups is started through a touch screen during testing, and the input logic combination is controlled by a programmable controller so as to realize the variable load adjustment of the low-voltage frequency converter. The maintenance requirement of the low-voltage frequency converter is met, and meanwhile, the high success rate of maintenance is guaranteed.
Description
Technical Field
The utility model belongs to the technical field of detection and diagnosis application of low-voltage frequency converters, and particularly relates to a variable load device for diagnosis of a low-voltage frequency converter.
Background
Along with the continuous maturity of low-voltage frequency converter technology, the diversified characteristics of control mode especially in the special advantage in energy-conserving field aspect for the frequency converter has obtained wide application in all trades of china, such as metallurgical, chemical industry, papermaking, machinery etc. fields, and nearly national economy all trades are inseparable with the frequency converter.
The low-voltage frequency converter is a high-end product integrating a plurality of subjects such as power electronics technology, electric dragging technology, computer technology, communication technology and the like.
The method is widely applied and is a relatively complex technology, and is particularly important for the maintenance of the frequency converter. The diagnosis of the frequency converter requires not only a high level of skill of maintenance engineers but also a high level of techniques and methods for diagnosing faults of the low voltage frequency converter.
Techniques and methods for diagnosing faults of a low-voltage inverter have been studied by maintenance engineers. In practical situations, after the maintenance of the low-voltage frequency converter is completed, no-load starting, running and frequency modulation are normal, most of the situations are correct, but due to the aging problem of power electronic devices, once the low-voltage frequency converter is loaded under normal load, problems with different degrees can be generated, so that the low-voltage frequency converter cannot normally run, and as the running time of the low-voltage frequency converter is increased, the situation is more common, that is, some devices of the low-voltage frequency converter cannot detect faults in a cold state, and the faults can appear in a hot state.
Disclosure of Invention
The present utility model is directed to a variable load device for diagnosing a low-voltage inverter, which solves the problems set forth in the background art.
The technical scheme adopted by the utility model is as follows:
the variable load device for diagnosing the low-voltage frequency converter comprises three alternating-current contactors and three resistor groups, wherein the output ends of the three alternating-current contactors are respectively connected with the corresponding resistor groups, the three alternating-current contactors are connected in parallel and then are connected with the output end of the diagnosed low-voltage frequency converter, variable load is provided for the diagnosed low-voltage frequency converter, and the input end of the diagnosed low-voltage frequency converter is connected with a three-phase alternating-current 380V detection power supply.
Preferably, the three-phase output cables of the diagnosed low-voltage frequency converter are respectively provided with a current transformer, and the wiring terminals of the current transformers are respectively connected with the corresponding ampere meters to detect and display the phase output current of the diagnosed low-voltage frequency converter.
Preferably, the three-phase output ends of the diagnosed low-voltage frequency converter are connected with voltmeters, and the output voltage of the diagnosed low-voltage frequency converter is detected and displayed.
Preferably, the touch screen also comprises a programmable controller which is connected to the touch screen through a connecting cable, and the output terminals of the programmable controller are respectively connected to coils of the three alternating-current contactors through connecting wires; the other output terminal is connected to the start-stop terminal of the diagnosed low-voltage inverter.
In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:
in the utility model, in the maintenance process of the low-voltage frequency converter, the three-phase output end of the low-voltage frequency converter is connected to serve as the load of the low-voltage frequency converter, during testing, the input of the frequency converter and the control resistor group is started through the touch screen, and the logic combination of the input is controlled by the programmable controller, so that the load change of the low-voltage frequency converter from low to medium to high is realized, and the load variable adjustment is realized. The maintenance requirement of the low-voltage frequency converter is met, and meanwhile, the high success rate of maintenance is guaranteed.
Drawings
FIG. 1 is a schematic diagram of the connection of the present utility model;
in the figure: 1. a three-phase alternating current 380V detection power supply; 2. a diagnosed low voltage inverter; 3. a current transformer; 4. an alternating current contactor; 5. a resistor group; 6. an ammeter; 7. a voltmeter; 8. a programmable controller; 9. a touch screen.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Examples:
the variable load device for diagnosing the low-voltage frequency converter comprises three alternating-current contactors 4 and three resistor groups 5, wherein the output ends of the three alternating-current contactors 4 are respectively connected with the corresponding resistor groups 5, the three alternating-current contactors 4 are connected in parallel and then connected with the output end of the diagnosed low-voltage frequency converter 2, variable load is provided for the diagnosed low-voltage frequency converter 2, and the input end of the diagnosed low-voltage frequency converter 2 is connected with a three-phase alternating-current 380V detection power supply 1.
In one possible implementation, the three-phase output cables of the diagnosed low-voltage frequency converter 2 are provided with current transformers 3, and the connection terminals of the current transformers are respectively connected with corresponding ammeter 6 to detect and display the phase output currents of the diagnosed low-voltage frequency converter 2.
In one possible implementation, the three-phase output ends of the diagnosed low-voltage frequency converter 2 are connected with a voltmeter 7, and the output voltage of the diagnosed low-voltage frequency converter 2 is detected and displayed.
In a possible embodiment, the touch screen device further comprises a programmable controller 8 connected to the touch screen 9 through a connecting cable, and output terminals of the programmable controller 8 are respectively connected to coils of the three alternating current contactors 4 through connecting wires; the other output terminal is connected to the start-stop terminal of the diagnosed low-voltage inverter 2.
In one possible embodiment, a variable load device for diagnosing a low-voltage frequency converter comprises an alternating-current contactor 4, a resistor group 5, an ammeter 6, a voltmeter 7, a current transformer 3, a programmable controller 8, a touch screen 9 and related accessories.
Further, the main loop includes:
the three-phase alternating current 380V detection power supply 1 is connected to the input end of the low-voltage frequency converter 2 to be detected and used as the input power supply of the low-voltage frequency converter 2 to be detected.
The input ends of the alternating-current contactor 1, the alternating-current contactor 2 and the alternating-current contactor 3 are connected in parallel and then connected to the output end of the low-voltage frequency converter 2 to be tested, so as to provide variable load for the low-voltage frequency converter 2 to be tested.
The output ends of the alternating current contactor 1, the alternating current contactor 2 and the alternating current contactor 3 are respectively connected to the resistor group 1, the resistor group 2 and the resistor group 3 in series, so that the load connected to the low-voltage frequency converter 2 to be tested is changed.
The current transformer 1, the current transformer 2 and the current transformer 3 respectively penetrate through three-phase output cables of the low-voltage frequency converter 2 to be tested, and wiring terminals of the current transformer 1, the current meter 2 and the current meter 3 are respectively connected into the current meter 1, the current meter 2 and the current meter 3 to detect and display phase output currents of the low-voltage frequency converter 23 to be tested.
The voltmeter 1, the voltmeter 2 and the voltmeter 3 are respectively connected to the phase output end of the low-voltage frequency converter 23 to be tested, and the output voltage of the low-voltage frequency converter 2 to be tested is detected and displayed.
Control loop:
the programmable controller 8 is connected to the touch screen 9 through a special connecting cable, and the programmable control digital quantity output terminals are respectively connected to coils of the alternating current contactor 1, the alternating current contactor 2 and the alternating current contactor 3 through connecting wires; the other output terminal is connected to the start-stop terminal of the low voltage frequency converter 2 to be tested.
Working principle:
when the low-voltage frequency converter 2 to be tested needs to be diagnosed, as shown in fig. 1, the three-phase 380V detection power supply 1 is connected to the input power supply of the low-voltage frequency converter 2 to be tested, the output end of the low-voltage frequency converter 2 to be tested is connected to the variable load input end, and the connection is correct, so that the start-stop terminal of the low-voltage frequency converter 2 to be tested is connected to the corresponding terminal of the variable load device.
1) The low-voltage frequency converter 2 to be tested is electrified, and whether the display panel of the frequency converter is normal or not is checked;
2) The variable load device controls the power supply to be powered on, and whether each state of the variable device is normal or not is checked through the touch screen.
3) After the two items are normal, selecting low load through a touch screen, and switching on an alternating current contactor 1 to connect a resistor group 1 to a low-voltage frequency converter 2 to be tested;
4) Starting variable frequency operation, checking whether various states of the low-voltage frequency converter 2 to be tested are normal or not in the starting process, gradually increasing the frequency for checking, and simultaneously observing display values of an ammeter and a voltmeter;
5) If the process of 4) is normal, reducing the frequency of the low-voltage frequency converter 2 to be tested;
6) Repeating the step 4) through the load in the selection of the touch screen;
7) If the process is normal, reducing the frequency of the frequency converter;
8) Selecting high load through touch screen, repeating the step 4)
9) If 8) is normal, the low-voltage frequency converter 2 to be tested is normally loaded, and the whole maintenance process is completed.
Therefore, the application of the variable load device for the diagnosis of the low-voltage frequency converter can solve the detection problem of the low-voltage frequency converter in a cold state during diagnosis, improves the success rate of the maintenance of the low-voltage frequency converter, and has higher cost performance because of low price.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (4)
1. The utility model provides a low voltage inverter is variable load device for diagnosis which characterized in that: the three-phase alternating current power supply comprises three alternating current contactors (4) and three resistor groups (5), wherein the output ends of the three alternating current contactors (4) are respectively connected with the corresponding resistor groups (5), the three alternating current contactors (4) are connected in parallel and then are connected with the output ends of the diagnosed low-voltage frequency converter (2), variable loads are provided for the diagnosed low-voltage frequency converter (2), and the input ends of the diagnosed low-voltage frequency converter (2) are connected with a three-phase alternating current 380V detection power supply (1).
2. A variable load device for diagnosis of a low-voltage inverter according to claim 1, wherein: the three-phase output cables of the diagnosed low-voltage frequency converter (2) are respectively provided with a current transformer (3), and the wiring terminals of the current transformers are respectively connected with a corresponding ammeter (6) to detect and display the phase output current of the diagnosed low-voltage frequency converter (2).
3. A variable load device for diagnosis of a low-voltage inverter according to claim 1, wherein: the three-phase output ends of the diagnosed low-voltage frequency converter (2) are connected with voltmeters (7) for detecting and displaying the output voltage of the diagnosed low-voltage frequency converter (2).
4. A variable load device for diagnosis of a low-voltage inverter according to claim 1, wherein: the touch screen also comprises a programmable controller (8), wherein the programmable controller is connected to the touch screen (9) through a connecting cable, and output terminals of the programmable controller (8) are respectively connected to coils of the three alternating-current contactors (4) through connecting wires; the other output terminal is connected to the start-stop terminal of the diagnosed low-voltage inverter (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321771735.5U CN220357177U (en) | 2023-07-07 | 2023-07-07 | Variable load device for diagnosis of low-voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321771735.5U CN220357177U (en) | 2023-07-07 | 2023-07-07 | Variable load device for diagnosis of low-voltage frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220357177U true CN220357177U (en) | 2024-01-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321771735.5U Active CN220357177U (en) | 2023-07-07 | 2023-07-07 | Variable load device for diagnosis of low-voltage frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220357177U (en) |
-
2023
- 2023-07-07 CN CN202321771735.5U patent/CN220357177U/en active Active
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