CN207765943U - Frequency converter output short circuit protective device - Google Patents
Frequency converter output short circuit protective device Download PDFInfo
- Publication number
- CN207765943U CN207765943U CN201721738083.XU CN201721738083U CN207765943U CN 207765943 U CN207765943 U CN 207765943U CN 201721738083 U CN201721738083 U CN 201721738083U CN 207765943 U CN207765943 U CN 207765943U
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- China
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- lines
- circuit
- current sensor
- frequency converter
- motor
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Abstract
Frequency converter output short circuit protective device, including motor and frequency converter, frequency converter are powered by three-phase alternating current, that is, U lines, V lines and W lines to motor, and the first current sensor, the second current sensor and third current sensor have been electrically connected on U lines, V lines and W lines；The current signal input detecting circuit of first current sensor, the second current sensor and third current sensor, the detection signal of detection circuit is conveyed to CPU processor and circuit for controlling motor, when detection circuit is alarmed, circuit for controlling motor shutdown signal exports, CPU processor removes the control signal of circuit for controlling motor, is closed to cause frequency converter power-off.It to three-phase alternating current, that is, U lines, V lines and the W lines phase fault of motor and can play preferable protective effect to big ground short circuit.
Description
Technical field：
The utility model is related to technical field of motors, are filled more specifically to a kind of frequency converter short-circuit protection of motor
It sets.
Background technology：
Frequency converter is in use often since electrical fault or wiring error cause output power line to have short circuit existing
As short circuit phenomenon is divided into as UVW phase faults and UVW respectively to big ground short circuit, some protect circuits on the market at present, only
It can accomplish that phase fault is protected, but for UVW respectively to big ground short circuit then without good method, once it is short to the earth
Road will burn frequency converter, and heavy losses can be brought especially for tens kilowatts of powerful frequency converters.
Utility model content：
The purpose of the utility model is to solve the deficiencies of the prior art, and provides frequency converter output short circuit protective device,
It to three-phase alternating current, that is, U lines, V lines and the W lines phase fault of motor and can play preferable protective effect to big ground short circuit.
The technology solution of the utility model is as follows：
Frequency converter output short circuit protective device, including motor and frequency converter, frequency converter pass through three-phase alternating current, that is, U lines, V lines
It powers to motor with W lines, the first current sensor, the second current sensor and third has been electrically connected on U lines, V lines and W lines
Current sensor；
The current signal input detecting circuit of first current sensor, the second current sensor and third current sensor,
The detection signal of detection circuit is conveyed to CPU processor and circuit for controlling motor, when detection circuit is alarmed, circuit for controlling motor
Shutdown signal exports, and CPU processor removes the control signal of circuit for controlling motor, is closed to cause frequency converter power-off.
The warning circuit that the detection circuit is made of capacitance, diode and alarm switch, when alarm switch is closed,
Detection circuit generates alarm signal and is conveyed to CPU processor and circuit for controlling motor.
The beneficial effects of the utility model are：
It can be played preferably to three-phase alternating current, that is, U lines, V lines and the W lines phase fault of motor and to big ground short circuit
Protective effect.
Description of the drawings：
Fig. 1 is the circuit block diagram of the utility model；
Fig. 2 is the circuit of the first current sensor, the second current sensor, third current sensor and detection circuit part
Figure.
Specific implementation mode：
Embodiment：See Fig. 1, shown in 2, becomes frequency converter output short circuit protective device, including motor 1 and frequency converter 2, frequency converter
2 are powered by three-phase alternating current, that is, U lines, V lines and W lines to motor 1, and the first electric current biography has been electrically connected on U lines, V lines and W lines
Sensor 3, the second current sensor 4 and third current sensor 5；
The current signal input detection electricity of first current sensor 3, the second current sensor 4 and third current sensor 5
The detection signal on road 6, detection circuit 6 is conveyed to CPU processor 7 and circuit for controlling motor 8, when detection circuit 6 is alarmed, electricity
8 shutdown signal of machine control circuit exports, and CPU processor 7 removes the control signal of circuit for controlling motor 8, to cause frequency converter 2
Power-off is closed.
The warning circuit that the detection circuit 6 is made of capacitance, diode and alarm switch K, when alarm switch K is closed
When, detection circuit 6 generates alarm signal and is conveyed to CPU processor 7 and circuit for controlling motor 8.
Operation principle：Either U lines, V lines or W lines are still respectively U lines, V lines or W line phase faults to big ground short circuit,
The high current that transcient short circuit time generates can all flow through the first current sensor 3, the second current sensor 4 and third current sensor 5.
The current signal that the first current sensor 3, the second current sensor 4 and third current sensor 5 detect under normal circumstances is
Sine-wave current signal will produce abnormal current fluctuation signal when a short circuit occurs, causes alarm switch K and is closed, to motor
8 shutdown signal of control circuit exports, and CPU processor 7 removes the control signal of circuit for controlling motor 8, then causes frequency converter 2 and break
Electricity, to play the role of short-circuit protection to motor 1.
Claims (2)
1. frequency converter output short circuit protective device, including motor (1) and frequency converter (2), frequency converter (2) are by three-phase alternating current
U lines, V lines and W lines are powered to motor (1), it is characterised in that：It is electrically connected the first current sensor on U lines, V lines and W lines
(3), the second current sensor (4) and third current sensor (5)；
The current signal input detection of first current sensor (3), the second current sensor (4) and third current sensor (5)
The detection signal of circuit (6), detection circuit (6) is conveyed to CPU processor (7) and circuit for controlling motor (8), works as detection circuit
(6) when alarming, circuit for controlling motor (8) shutdown signal output, CPU processor (7) removes the control letter of circuit for controlling motor (8)
Number, it is closed to cause frequency converter (2) power-off.
2. frequency converter output short circuit protective device according to claim 1, it is characterised in that：Detection circuit (6) is by electricity
Hold, the warning circuit of diode and alarm switch (K) composition, when alarm switch (K) is closed, detection circuit (6) generates alarm
Signal is conveyed to CPU processor (7) and circuit for controlling motor (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721738083.XU CN207765943U (en) | 2017-12-13 | 2017-12-13 | Frequency converter output short circuit protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721738083.XU CN207765943U (en) | 2017-12-13 | 2017-12-13 | Frequency converter output short circuit protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207765943U true CN207765943U (en) | 2018-08-24 |
Family
ID=63186897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721738083.XU Active CN207765943U (en) | 2017-12-13 | 2017-12-13 | Frequency converter output short circuit protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207765943U (en) |
-
2017
- 2017-12-13 CN CN201721738083.XU patent/CN207765943U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant |