CN111313370A - Power supply open-phase protection circuit of alternating current servo speed regulation system - Google Patents
Power supply open-phase protection circuit of alternating current servo speed regulation system Download PDFInfo
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- CN111313370A CN111313370A CN201911169703.6A CN201911169703A CN111313370A CN 111313370 A CN111313370 A CN 111313370A CN 201911169703 A CN201911169703 A CN 201911169703A CN 111313370 A CN111313370 A CN 111313370A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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Abstract
A power supply phase failure protection circuit of an alternating current servo speed regulation system comprises a circuit breaker connected with a three-phase alternating current power supply, the output end of the circuit breaker is connected with a motor power circuit and a motor control circuit, the motor control circuit is connected with the motor power circuit, the motor power circuit comprises a contact of a contactor connected with the circuit breaker, the motor control circuit between the circuit breaker and the contactor is connected with the power supply phase failure protection circuit, the power supply phase failure protection circuit comprises one end of a contact of a relay connected with a second phase line, the other end of the contact of the relay is connected with one end of a coil of the relay, and the other end of the coil of the contactor is connected with the first phase line; the motor control circuit includes a coil of a relay connected in parallel with a switching power supply. The invention realizes the open-phase and open-phase protection by the relay circuit interlocking, has simple and reliable structure, solves the problems of open-phase and open-phase protection of the circuit and also solves the possible problems after the open-phase protector is additionally arranged.
Description
Technical Field
The invention belongs to the field of circuit protection, and particularly relates to a power supply open-phase protection circuit of an alternating current servo speed regulation system.
Background
When the three-phase alternating current servo speed regulating system works, the three-phase alternating current servo speed regulating system can still continue to operate under the condition of no phase failure and phase loss protection, a servo driver, a motor and a dragged load all work in abnormal states, equipment is easily damaged, burnt or short-circuited, especially, safety problems caused by the burning of the motor in low-speed phase failure operation are solved, a phase failure protector is additionally arranged at a power supply end of a circuit, the phase failure, phase loss and phase sequence protection is realized, and the safety problems caused by the phase failure and the phase loss of the circuit, such as the burning of the motor and the like, are avoided. However, the protector needs to ensure accurate wiring phase sequence when assembling and wiring, if the phase sequence is connected in a wrong way, the motor turns in a reverse direction, so that the load running direction is opposite, and potential safety hazards are brought.
Fig. 1 shows a conventional three-phase ac servo system with phase loss protector, which generally comprises a motor power circuit and a control circuit. The motor power circuit comprises a soft start unit, a driver, a motor and the like and is used for driving the motor and regulating the speed of the motor. The control circuit consists of a transformer, a switching power supply, a singlechip or a DSP and the like and is used for controlling the enabling of the driver, detecting the working state of the driver, displaying and the like. When the power supply is in phase failure and phase loss, the phase failure protector enables the coil of the contactor KM to be in power failure, so that a power supply circuit of the motor is cut off, and the motor stops working.
However, as can be seen from fig. 1, when the open-phase protector fails, the motor may still work when the power supply is open-phase or phase-loss, and in addition, if any phase of the three power cables at the motor end is phase-loss, the open-phase protector cannot protect the motor.
Disclosure of Invention
The invention provides a power supply open-phase protection circuit of an alternating current servo speed regulating system, which aims to solve the problem that a motor cannot be protected even if an additionally-installed open-phase protector fails in the three-phase alternating current servo speed regulating system in the prior art.
The invention adopts the following technical scheme:
a power supply phase failure protection circuit of an alternating current servo speed regulation system comprises a circuit breaker connected with a three-phase alternating current power supply, the output end of the circuit breaker is connected with a power circuit and a motor control circuit, the motor control circuit is connected with the power circuit, the power circuit of the motor comprises a contact of a contactor KM connected with the circuit breaker, the power supply phase failure protection circuit is connected on the motor control circuit between the circuit breaker QF and the contactor KM, the power supply phase failure protection circuit comprises one end of a contact of a relay K0 connected with a second phase line, the other end of the contact of the relay K02 is connected with one end of a coil of the relay KM, and the other end of the coil of the contactor KM is connected with the first phase line; the motor control circuit includes the coil of relay K02 connected in parallel with a switching power supply.
And the coil of the contactor KM is connected with an RC series circuit in parallel.
The contact of contactor KM is connected with the contact of relay KM1, the contact of contactor KM1 is connected with the servo driver, the servo driver is connected with the motor and the processor, and the processor is connected with the power circuit of the motor.
The motor control circuit comprises a breaker QF1 connected with the second phase line and the first phase line, a breaker QF1 is connected with a transformer T, the transformer T is connected with a switching power supply VC2, and the switching power supply VC2 is connected with a coil of a relay K02 in parallel and then is connected with a processor.
The invention has the beneficial effects that: the invention realizes the open-phase and open-phase protection by the relay circuit interlocking, has simple and reliable structure, solves the problems of open-phase and open-phase protection of the circuit and also solves the possible problems after the open-phase protector is additionally arranged.
Drawings
Fig. 1 shows a conventional three-phase ac servo system with a phase loss protector.
Fig. 2 is a schematic diagram of the technical scheme of the invention.
Fig. 3 is a flow chart of the technical solution of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention provides a power supply open-phase protection circuit of an alternating current servo speed control system based on the problem that the open-phase protector cannot protect a motor when any phase of a power cable is lost, and the power supply open-phase protection circuit of the open-phase protector is characterized in that a relay K02 is additionally arranged in the circuit, and the relay K02 can control a contactor KM coil of a soft start unit to be connected or disconnected, so that the soft start unit is powered off and the motor stops rotating.
Specifically, the ac servo speed control system includes a circuit breaker QF connected to a three-phase ac power supply, where the circuit breaker QF is connected to a motor power circuit and a motor control circuit, where the motor power circuit includes a soft start unit, a servo driver, and a motor connected to the servo driver, and the motor control circuit includes a transformer, a switching power supply, and a processor. The soft start unit comprises a contactor KM1 and a contactor KM, wherein a breaker QF is connected with a contact of the contactor KM, a contact group of the contactor KM is connected with a contact of a contactor KM1, a contact of the contactor KM1 is connected with a servo driver, and the servo driver is connected with a motor M01. A third phase line between a contact of the contactor KM1 and a contact of the contactor KM2 is connected with one end of one contact of the contactor KM1, the other end of the contact of the contactor KM1 is connected with one end of a coil of the contactor KM1, the contact is connected with a contact of a relay time delay KT in parallel, the relay KT belongs to a time delay relay, the coil of the relay KT is connected with the contact of the contactor KM, when the closing action of the contactor KM occurs, the coil of the relay KT acts after time delay setting, the other end of the coil of the contactor KM1 is connected with a second phase line, wherein the coil of,
the motor control circuit comprises a breaker QF1 connected with a second phase line and a first phase line, the breaker QF1 is connected with a transformer T, the transformer T is connected with a switching power supply VC2, and the switching power supply VC2 is connected with a coil of a relay K02 in parallel and then is connected with a processor, a contactor KM and a contactor KM 1. The switching power supply is an existing switching power supply. The processor can select the existing singlechip. The single chip microcomputer can be connected with the contactors and the relays to obtain the states of the contactors and the relays. The switch power supply VC2 is connected with a coil of the relay K01 in parallel, and the output end of the switch power supply is connected with the coil of the relay K02 in parallel after passing through a contact of the relay K01.
On the basis, the power supply open-phase protection circuit comprises one end of a contact of a relay K02 connected with a second phase line, the other end of the contact of the relay K02 is connected with one end of a coil of a contactor KM, and the other end of the coil of the contactor KM is connected with the first phase line; in some embodiments, the coils of contactor KM are connected in parallel in an RC series circuit. The power supply open-phase protection circuit also comprises a coil of a relay K02, wherein the coil of the relay K02 is connected with the switching power supply in parallel.
As can be seen from fig. 1, when the phase of the first phase line 04 or the phase of the second phase line 05 is lost, the coil of the contactor KM is powered off, and the soft start unit is powered off to stop the motor M01; when the second phase line 05 phase or the third phase line 06 phase is disconnected and loses power, the transformer T, the switch power supply VC2 and the relay K02 coil are all powered off, at the moment, the relay K02 coil is powered off, so that the contact of the relay K02 of the control contactor KM coil is powered off, the contactor KM coil is also powered off, and then the soft start unit is powered off, so that the motor stops rotating.
Simultaneously the singlechip can control relay K01 coil and add power on or cut off the power supply, the singlechip passes through servo driver detection servo driver, motor operating condition, work abnormally when detecting servo driver or motor, makes relay K01 coil outage, and relay K01 contact disconnection makes relay K02 coil outage, and relay K02 contact disconnection, then contactor KM outage, soft start unit outage makes the motor stall.
The protection working process of the system phase failure and phase loss comprises the following steps:
A. the singlechip is electrified for self-checking to detect that the AC speed regulating system works normally in the initial state;
B. the single chip microcomputer detects the working states of the contactor KM1, the relay and the like in real time, and the running state of the real-time monitoring system is guaranteed;
C. when the first phase line 04 or the second phase line 05 is disconnected and loses power, the coil of the contactor KM is powered off, and the soft start unit is powered off to stop the motor; when the second phase line 05 or the third phase line 06 is open-phase and loses power, the transformer, the switch power supply and the relay K02 coil are all powered off, the relay K02 coil is powered off to enable the relay K02 contact of the control contactor coil to be powered off, the contactor KM coil is also powered off, the soft start unit is powered off to enable the motor to stop rotating, the three-phase alternating current speed regulation system is ensured to be powered off under the condition that the power supply loses phase, the motor stops working, and the power supply circuit is protected from open-phase and loss-phase;
D. the single chip microcomputer detects the working states of the servo driver and the motor through the servo driver, when abnormal work is detected, the relay K01 coil is controlled to be powered off, the relay K01 contact is disconnected to enable the relay K02 coil to be powered off, the relay K02 contact is disconnected to enable the contactor KM to be powered off, the soft starting unit is powered off to enable the motor to stop working, and phase loss protection of any three-phase power line at the motor end is achieved.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the present invention should be covered by the present invention.
Claims (4)
1. The utility model provides an exchange servo speed control system's power phase failure protection circuit, exchange servo speed control system includes the circuit breaker (QF) of being connected with three-phase alternating current power supply, the output connection motor power circuit and the motor control circuit of circuit breaker (QF), motor control circuit connection motor power circuit, motor power circuit includes the contact of contactor (KM) of being connected with the circuit breaker, its characterized in that: a power supply open-phase protection circuit is connected to a motor control circuit between the breaker (QF) and the contactor (KM), the power supply open-phase protection circuit comprises one end of a contact of a relay (K02) connected with a second phase line, the other end of the contact of the relay (K02) is connected with one end of a coil of the relay (KM), and the other end of the coil of the contactor (KM) is connected with the first phase line; the motor control circuit includes a coil of a relay (K02) connected in parallel with a switching power supply.
2. The power supply open-phase protection circuit of the alternating current servo speed regulation system according to claim 1, characterized in that: and the coil of the contactor (KM) is connected with an RC series circuit in parallel.
3. The power supply open-phase protection circuit of the alternating current servo speed regulation system according to claim 1, characterized in that: the contactor (KM) is connected with the relay (KM 1), the contactor (KM 1) is connected with the servo driver, the servo driver is connected with the motor and the processor, and the processor is connected with the motor power circuit.
4. The power supply open-phase protection circuit of the AC servo speed regulation system according to claim 3, characterized in that: the motor control circuit comprises a breaker I (QF 1) connected with a second phase line and a first phase line, the breaker I (QF 1) is connected with a transformer (T), the transformer (T) is connected with a switch power supply (VC 2), and the switch power supply (VC 2) is connected with a processor after being connected with a coil of a relay (K02) in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911169703.6A CN111313370A (en) | 2019-11-26 | 2019-11-26 | Power supply open-phase protection circuit of alternating current servo speed regulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911169703.6A CN111313370A (en) | 2019-11-26 | 2019-11-26 | Power supply open-phase protection circuit of alternating current servo speed regulation system |
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| Publication Number | Publication Date |
|---|---|
| CN111313370A true CN111313370A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911169703.6A Pending CN111313370A (en) | 2019-11-26 | 2019-11-26 | Power supply open-phase protection circuit of alternating current servo speed regulation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114984A (en) * | 2021-10-20 | 2022-03-01 | 北京国科诚泰农牧设备有限公司 | Control system of TMR central kitchen |
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2019
- 2019-11-26 CN CN201911169703.6A patent/CN111313370A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114984A (en) * | 2021-10-20 | 2022-03-01 | 北京国科诚泰农牧设备有限公司 | Control system of TMR central kitchen |
| WO2023066319A1 (en) * | 2021-10-20 | 2023-04-27 | 北京国科诚泰农牧设备有限公司 | Control system for tmr central kitchen |
| CN114114984B (en) * | 2021-10-20 | 2024-05-10 | 北京国科诚泰农牧设备有限公司 | Control system of TMR central kitchen |
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