CN211453818U - Motor load detection switching circuit - Google Patents
Motor load detection switching circuit Download PDFInfo
- Publication number
- CN211453818U CN211453818U CN201922270130.8U CN201922270130U CN211453818U CN 211453818 U CN211453818 U CN 211453818U CN 201922270130 U CN201922270130 U CN 201922270130U CN 211453818 U CN211453818 U CN 211453818U
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- motor load
- switching circuit
- contactor
- load
- frequency converter
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 238000012423 maintenance Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Control Of Ac Motors In General (AREA)
Abstract
The utility model provides a motor load detection switching circuit, which comprises a main loop and a control loop, wherein the control loop is matched with the main loop to realize the maintenance and the test of a frequency converter; first contactor is used for controlling the access and the disconnection of motor load, first contactor passes through low voltage component control, has solved and has adopted the artificial mode to change the problem that there is the potential safety hazard in the in-process of maintaining and testing the converter for thereby through the nimble selection load size of circuit, need not take the load at every turn and connect the motor line again after not can not take place the maloperation, and the contactor passes through the low voltage button operation, has avoided direct contact high voltage, heavy current.
Description
Technical Field
The utility model relates to a converter test and maintenance technical field especially relate to a motor load switching circuit when maintenance and test converter.
Background
At present, the maintenance and test frequency converter adopts the mode of artificially changing motor cable to carry out different power load tests, maintenance personal or testing personnel often have the wrong line of connecing when the operation, the screw forgets operating problems such as tighten, these operating problems exist and make maintenance personal or testing personnel's potential safety hazard of electrocuting, and measure output current in maintenance and test process and need measure the cable card line with the current clamp table, can not measure three-phase current simultaneously, measure output voltage and need handheld universal meter measurement frequency converter output, there is certain danger and can not measure three-phase voltage simultaneously, be not convenient for the analysis.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of motor load detects switch circuit has solved and has adopted the problem that the artificial mode exists the potential safety hazard in the in-process of maintaining and testing the converter to change the motor cable mode for through the nimble load size of selecting of circuit, thereby need not take place the maloperation after the load at every turn to connect the motor line again.
In order to achieve the above object, the technical solution of the present invention is specifically realized as follows:
the utility model discloses a motor load detection switching circuit, which comprises a main loop and a control loop, wherein the control loop is matched with the main loop to realize the maintenance and the test of a frequency converter, the main loop comprises a motor load and a first contactor, wherein the motor load with different powers is connected with the output end of the frequency converter through three main contact connecting terminals of the corresponding first contactor; the first contactor is used for controlling the connection and disconnection of a motor load and is controlled by a low-voltage element.
Furthermore, the motor load switching circuit also comprises a current detection mutual inductor, a three-phase current meter and a three-phase voltage meter, wherein the current detection mutual inductor is used for sampling the current at the output end of the frequency converter; the three-phase ammeter is used for detecting the current at the output end of the frequency converter; the three-phase voltmeter is used for detecting the voltage of the output end of the frequency converter.
Further, the motor load switching circuit also comprises a load indicator light for visually displaying the connection and disconnection of the motor load.
Furthermore, the number of the load indicator lamps is three, and the three load indicator lamps are respectively connected with the three main contact wiring terminals of the second contactor.
Further, a button is included in the control circuit, and the button is a low-voltage element.
The beneficial technical effects are as follows:
1. the utility model provides a motor load detection switching circuit, including main loop and control circuit, control circuit cooperates the main loop in order to realize the maintenance and the test of converter, the main loop includes motor load and first contactor, wherein, the motor load of different power is connected to the output of converter through the three main contact binding post of the first contactor that corresponds; the first contactor is used for controlling the connection and disconnection of a motor load, and is controlled by a low-voltage element, so that the problem of potential safety hazard caused by the fact that a motor cable is replaced manually in the process of maintaining and testing the frequency converter is solved, the size of the load is flexibly selected through a circuit, and the motor wire does not need to be reconnected after the load is carried each time, so that misoperation cannot occur;
2. the utility model discloses a motor load switching circuit, which controls the connection and disconnection of the motor load through a contactor, and the contactor is operated through a low-voltage button, thereby avoiding direct contact with high voltage and heavy current;
3. the utility model discloses a motor load switching circuit also comprises a current detection mutual inductor, a three-phase current meter and a three-phase voltmeter, wherein, the current detection mutual inductor is used for sampling the current of the output end of the frequency converter; the three-phase ammeter is used for detecting the current at the output end of the frequency converter; the three-phase voltmeter is used for detecting the voltage of converter output, observes through three-phase voltmeter and three-phase ampere meter and can observe data simultaneously, and the analysis of being convenient for saves maintenance and test time.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments will be briefly described below.
Fig. 1 is a main circuit structure diagram of a motor load detection switching circuit according to the present invention;
fig. 2 is a control circuit structure diagram of the motor load detection switching circuit of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The utility model provides a motor load detection switching circuit, refer to fig. 1-2, including main loop and control circuit, the control circuit cooperates the main loop in order to realize the maintenance and the test of converter, the main loop refers to fig. 1, including motor load and first contactor, wherein, the motor load of different power is connected to the output of converter through the three main contact binding post of the first contactor that corresponds; first contactor is used for the access and the disconnection of control motor load, first contactor passes through the control of low voltage component, specifically, power is the output that the motor load of 2.2KW connects in the converter through the three main contact binding post of the first contactor KM7 that corresponds, power is the output that the motor load of 11KW connects in the converter through the three main contact binding post of the first contactor KM8 that corresponds, power is the three main contact binding post of the motor load of 37KW through the first contactor KM9 that corresponds and connects in the output of converter, through the access of first contactor control motor load and disconnection, and the contactor passes through the operation of low pressure button, direct contact high voltage has been avoided, the heavy current, through the flexible load size of selecting of circuit, thereby need not take the motor connecting wire again behind the load at every turn and can not take place the maloperation.
As a preferred technical solution of the present invention, the motor load switching circuit further comprises a current detection transformer, a three-phase current meter and a three-phase voltage meter, wherein the current detection transformer is used for sampling the current at the output end of the frequency converter; the three-phase ammeter is used for detecting the current at the output end of the frequency converter; the three-phase voltmeter is used for detecting the voltage of converter output, observes through three-phase voltmeter and three-phase ampere meter and can observe data simultaneously, need not take the universal meter to measure in proper order, and the analysis of being convenient for saves maintenance and test time.
As an embodiment of the utility model, motor load switching circuit still includes the load indicator for the access and the disconnection of visual display motor load, specifically, load indicator quantity is three, and three load indicator connects U output terminal, V output terminal and the W output terminal of converter through the three main contact terminal of second touch device KM6 respectively.
Control circuit referring to fig. 2, the control circuit includes buttons SB7, SB8, SB9, SB10 and SB11, wherein the buttons are all low voltage elements, specifically, button SB7 is connected in parallel with the terminals of the auxiliary contacts of second contactor KM6, button SB8 is connected in parallel with the terminals of the auxiliary contacts of first contactor KM7, button SB9 is connected in parallel with the terminals of the auxiliary contacts of first contactor KM8, and button SB10 is connected in parallel with the terminals of the auxiliary contacts of first contactor KM 9.
The utility model discloses in a motor load detects switching circuit's working process does:
when a motor load test is performed on a frequency converter which is maintained or to be tested, the test is generally performed from a low-power load to a high-power load in sequence.
Firstly, a power supply of a maintained or to-be-tested frequency converter is connected well, then output wiring ends U, V and W of the frequency converter are respectively connected to a load input end of a motor, a button SB7 is pressed, a load indicator lamp is lightened, the maintained or to-be-tested frequency converter is started, the speed is slowly increased, at the moment, whether the numerical value of a three-phase voltmeter is increased regularly and whether the three-phase voltage is consistent or not is observed, the numerical value of a three-phase ammeter is observed, when the data of the three-phase voltmeter and the three-phase ammeter are observed to be normal, the maintained or to-be-tested frequency converter is stopped, after the voltage is observed to be 0V, a stop button SB11 is pressed.
When the button SB8 is pressed, the power of the motor load is switched on by 2.2KW, the frequency converter to be maintained or tested is started and the speed is slowly increased, the three-phase current and the three-phase voltage data are observed, if the three-phase current and the three-phase voltage data are normal, the frequency converter to be maintained or tested is stopped, and the stop button SB11 is pressed.
When the button SB9 is pressed, the power is 11KW motor load is switched on, the frequency converter to be maintained or tested is started and the speed is slowly increased, the three-phase current and the three-phase voltage data are observed, if the three-phase current and the three-phase voltage data are normal, the frequency converter to be maintained or tested is stopped, and the stop button SB11 is pressed.
When the button SB10 is pressed, the power is 37KW motor load is switched on, the frequency converter to be maintained or tested is started and the speed is slowly increased, the three-phase current and the three-phase voltage data are observed, if the three-phase current and the three-phase voltage data are normal, the frequency converter to be maintained or tested is stopped, and the stop button SB11 is pressed.
Repeating the above operations, and sequentially carrying the motor load to the maintained or set power load of the frequency converter to be tested, so that the frequency converter can be judged to be repaired.
The above embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by the technical solutions of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (5)
1. The utility model provides a motor load detects switching circuit, includes major loop and control circuit, and control circuit cooperation major loop is in order to realize the maintenance and the test of converter, its characterized in that, major loop includes:
the motor loads with different powers are connected to the output end of the frequency converter through three main contact wiring terminals of the corresponding first contactor;
the first contactor is used for controlling the connection and disconnection of a motor load and is controlled by a low-voltage element.
2. The motor load detection switching circuit of claim 1, further comprising:
the current detection mutual inductor is used for sampling the current at the output end of the frequency converter;
the three-phase ammeter is used for detecting the current at the output end of the frequency converter;
and the three-phase voltmeter is used for detecting the voltage at the output end of the frequency converter.
3. The motor load detection switching circuit according to claim 2, further comprising a load indicator lamp for visually indicating connection and disconnection of the motor load.
4. The motor load detection switching circuit according to claim 3, wherein the number of the load indicator lamps is three, and three load indicator lamps are respectively connected with three main contact terminals of the second contactor.
5. The motor load detection switching circuit of claim 1, wherein the control circuit comprises a button, and the button is a low voltage element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922270130.8U CN211453818U (en) | 2019-12-17 | 2019-12-17 | Motor load detection switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922270130.8U CN211453818U (en) | 2019-12-17 | 2019-12-17 | Motor load detection switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211453818U true CN211453818U (en) | 2020-09-08 |
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ID=72298908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922270130.8U Expired - Fee Related CN211453818U (en) | 2019-12-17 | 2019-12-17 | Motor load detection switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211453818U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505458A (en) * | 2020-12-01 | 2021-03-16 | 南京智睿能源互联网研究院有限公司 | Low-voltage testing tool for capacitive and inductive plates and using method |
-
2019
- 2019-12-17 CN CN201922270130.8U patent/CN211453818U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505458A (en) * | 2020-12-01 | 2021-03-16 | 南京智睿能源互联网研究院有限公司 | Low-voltage testing tool for capacitive and inductive plates and using method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200908 |
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| CF01 | Termination of patent right due to non-payment of annual fee |