CN214124812U - Low-voltage motor control circuit - Google Patents
Low-voltage motor control circuit Download PDFInfo
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- CN214124812U CN214124812U CN202023001812.8U CN202023001812U CN214124812U CN 214124812 U CN214124812 U CN 214124812U CN 202023001812 U CN202023001812 U CN 202023001812U CN 214124812 U CN214124812 U CN 214124812U
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Abstract
The utility model relates to a low-voltage motor control circuit, a circuit breaker is arranged on the main circuit of the low-voltage motor control circuit; one end of the breaker is connected with the mains supply; the other end of the breaker is connected with one end of the contactor; the other end of the contactor is connected with a motor; a current transformer is arranged between the contactor and the motor; the motor control circuit controls the on-off of the circuit breaker and the contactor; the motor control circuit also comprises a low-voltage motor protection device for protecting the low-voltage motor control circuit; and the remote control switch is arranged in the motor control circuit and is used for remotely controlling the starting of the motor. Compared with the prior art, the low-voltage motor protection device is adopted to carry out voltage under-voltage over-voltage, current under-current over-current and remote control on the motor; the motor can be better protected, remote control can be realized, for example, the remote control system such as DCS can be used for better protecting and controlling the low-voltage motor control circuit.
Description
Technical Field
The embodiment of the utility model provides a motor control circuit, in particular to low-voltage motor control circuit is related to.
Background
The form that generally can adopt the electrothermal relay in current low-voltage motor control circuit, protect the motor, however, because the motor can not only have the load too big, cause the too big problem of electric current, still can produce because voltage fluctuation, the motor lacks looks the reason such as cause motor control protection device malfunctioning, finally lead to the motor to burn out, especially, in the motor that power is less than 11KW, above-mentioned problem appears more easily, simultaneously, in order to satisfy remote control's needs, low-voltage motor control circuit among the prior art more can't satisfy the requirement.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a low-voltage motor control circuit has adopted low-voltage motor protection device to carry out the under-voltage excessive pressure of voltage to the motor, and the electric current undercurrent overflows and realizes remote control's low-voltage motor control circuit.
In order to achieve the above object, an embodiment of the present invention provides a low voltage motor control circuit, including:
the circuit breaker is arranged on a main circuit of the low-voltage motor control circuit; one end of the circuit breaker is connected with mains supply; the other end of the breaker is connected with one end of the contactor;
the other end of the contactor is connected with a motor; a current transformer is arranged between the contactor and the motor;
the motor control circuit controls the on-off of the circuit breaker and the contactor;
the motor control circuit also comprises a low-voltage motor protection device for protecting the low-voltage motor control circuit;
and the remote control switch is arranged in the motor control circuit and is used for remotely controlling the starting of the motor.
The motor control circuit is provided with a control power supply, and the control power supply is connected to any phase of the outlet ends of the circuit breaker;
one end of the commercial power is connected with one end of the normally closed contact of the test switch; the other end of the normally closed contact of the test switch is connected with one end of the normally open contact of the test switch; the other end of the normally open contact of the test switch is connected with a phase line of the control power supply;
the outlet end of the normally closed contact of the test switch is connected with the inlet end of the first normally open contact of the remote control switch and the inlet end of the second normally open contact of the remote control switch;
the wire outlet end of the first normally open contact of the remote control switch and the wire outlet end of the second normally open contact of the remote control switch are respectively the wire inlet end of the first relay coil and the wire inlet end of the second relay coil; the outlet end of the first relay coil and the outlet end of the second relay coil are connected with a zero line of a control power supply;
the phase line of the control power supply is respectively connected to the first end point of the change-over switch and the third end point of the change-over switch; the fourth end point of the change-over switch is connected with the wire inlet end of the first normally open button;
the second end point of the change-over switch is connected to the wire inlet end of the first normally open contact of the first relay; the wire outlet end of the first normally open button and the wire outlet end of the first normally open contact of the first relay are respectively connected to the wire inlet end of the first normally closed button; the wire outlet end of the first normally closed button is connected to the wire inlet end of the first normally closed contact of the second relay;
the wire outlet end of the first normally closed contact of the second relay is connected with the wire inlet end of the first normally closed output contact of the low-voltage motor protection device; the outlet end of the first normally closed output contact of the low-voltage motor protection device is respectively connected to the inlet end of the third relay coil and the inlet end of the contactor coil; the wire inlet end of the third relay coil and the wire outlet end of the contactor coil are connected to a zero line of a control power supply;
a first normally open contact of a contactor and a first normally open output contact of a low-voltage motor protection device are connected in parallel to a first normally open contact of a first relay and a first normally open button to form local and remote start-stop control;
a phase line of the control power supply is connected to a wire inlet end of a second normally open output contact of the low-voltage motor protection device; the outlet end of a second normally open output contact of the low-voltage motor protection device is connected with the coil inlet end of the circuit breaker; a coil outlet end of the circuit breaker is connected to a zero line of a control power supply;
a phase line of the control power supply is connected to a wire inlet end of a first normally open contact of the third relay; the outlet end of the first normally open contact of the third relay; the wire inlet ends are respectively connected with the first indicator light and the second indicator light; the wire outlet ends of the first indicator light and the second indicator light are connected to a zero line of the control power supply;
a phase line of the control power supply is connected to a wire inlet end of a first normally closed contact of the third relay; the outlet end of the first normally closed contact of the third relay; the wire inlet ends are respectively connected with the third indicator light and the fourth indicator light; the wire outlet ends of the third indicator light and the fourth indicator light are connected to a zero line of the control power supply;
and controlling a power supply to supply power to the low-voltage motor protection device.
The la end, the lb end, the lc end and the ln end of the low-voltage motor protection device are respectively connected to the secondary side of the current transformer;
the Ua end, the Ub end, the Uc end and the Un end of the low-voltage motor protection device are respectively connected to the wire outlet end of the circuit breaker;
connecting a first contact of the circuit breaker to the end S1 of the low-voltage motor protection device; the end S2 of the low-voltage motor protection device is connected with a second normally open contact of a third relay; connecting a second contact of the circuit breaker to the end S4 of the low-voltage motor protection device; a third normally open contact of the remote control switch is connected to the end S5 of the low-voltage motor protection device; the end A of the low-voltage motor protection device and the end B of the low-voltage motor protection device are connected with a communication loop;
and a first normally open output contact of the low-voltage motor protection device is arranged between the R3 end and the CB2 end of the low-voltage motor protection device.
Wherein, the contactor is a 3RT series contactor.
Wherein, the circuit breaker is a 3VA series circuit breaker.
Wherein, the low-voltage motor protection device is an M512F-DE series low-voltage motor protection device.
The low-voltage motor control circuit is characterized in that the voltage of the low-voltage motor control circuit is 380V of alternating current.
Compared with the prior art, the low-voltage motor protection device is adopted to carry out under-voltage and over-voltage, under-current and over-current on the motor and realize the low-voltage motor control circuit of remote control; the motor can be better protected, meanwhile, remote control can be realized, for example, remote control systems such as DCS and the like can be used for better protecting and controlling the low-voltage motor control circuit.
Drawings
Fig. 1 is a schematic diagram of a main circuit of the present invention;
fig. 2 is a schematic diagram of a control circuit of the present invention;
fig. 3 is the wiring schematic diagram of the low-voltage motor protection device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
The first embodiment of the present invention relates to a low-voltage motor control circuit, as shown in fig. 1, fig. 2 and fig. 3, including:
the circuit breaker QF is arranged on a main circuit of the low-voltage motor control circuit; one end of the breaker QF is connected with commercial power L1, L2 and L3; the other end of the breaker QF is connected with one end of the contactor KM; the other end of the contactor KM is connected with a motor M; a current transformer TD is arranged between the contactor KM and the motor M;
the motor control circuit controls the on-off of the breaker QF and the contactor KM;
the motor control circuit also comprises a low-voltage motor protection device MCU for protecting the low-voltage motor control circuit;
and the remote control switch DCS is arranged in the motor control circuit and used for remotely controlling the starting of the motor M. The circuit can play a role of utilizing the low-voltage motor protection device MCU to carry out voltage under-voltage over-voltage and current under-current over-current on the motor M and realizing a low-voltage motor control circuit of remote control; the motor can be better protected, meanwhile, remote control can be realized, for example, remote control systems such as DCS and the like can be used for better protecting and controlling the low-voltage motor control circuit.
In the present embodiment, as shown in fig. 2, control power sources L11, N are provided in the motor control circuit, and the control power sources L11, N are connected to any one phase of the QF outlet terminal of the circuit breaker; any one of the phases of the commercial power is used as the control power source in the present embodiment.
One of the commercial power L1, L2 and L3 is connected with one end of a normally closed contact S20-1 of a test switch; the other end of the normally closed contact S20-1 of the test switch is connected with one end of the normally open contact S20-2 of the test switch; the other end of the normally open contact S20-2 of the test switch is connected with a phase line L11 of the control power supply; the circuit mainly realizes the power supply switching test of any phase of the test connection control power supply and the commercial power.
The outlet end of the test switch normally closed contact S20-1 is connected with the inlet end of a first normally open contact DCS-1 of the remote control switch and the inlet end of a second normally open contact DCS-2 of the remote control switch;
the outlet end of the first normally open contact DCS-1 of the remote control switch and the outlet end of the second normally open contact DCS-2 of the remote control switch are respectively the inlet end of the first relay coil KA1 and the inlet end of the second relay coil KA 2; the outlet end of the first relay coil KA1 and the outlet end of the second relay coil KA2 are connected with a zero line N of a control power supply; the circuit mainly realizes that the remote switch is connected with the motor control circuit, and realizes the remote control of the motor.
A phase line L11 of the control power supply is respectively connected to the first end point of the change-over switch 1SA and the third end point of the change-over switch 1 SA; the fourth end point of the change-over switch 1SA is connected with the wire inlet end of the first normally open button 1 SB;
the second end point of the change-over switch 1SA is connected to the incoming line end of the first normally open contact KA1-1 of the first relay; the wire outlet end of the first normally open button 1SB and the wire outlet end of the first normally open contact KA1-1 of the first relay are respectively connected to the wire inlet end of the first normally closed button 2 SB; the wire outlet end of the first normally closed button 2SB is connected to the wire inlet end of the first normally closed contact KA2-1 of the second relay;
the outlet end of the first normally closed contact KA2-1 of the second relay is connected with the inlet end of the first normally closed output contact MCU-1 of the low-voltage motor protection device; the outlet end of a first normally closed output contact MCU-1 of the low-voltage motor protection device is respectively connected to the inlet end of a third relay coil KA3 and the inlet end of a contactor KM coil; the inlet end of the third relay coil KA3 and the outlet end of the contactor KM coil are connected to a zero line N of a control power supply;
the first normally open contact KM-1 of the contactor and the first normally open output contact MCU-2 of the low-voltage motor protection device are connected in parallel to the first normally open contact KA1-1 of the first relay and the first normally open button 1SB to form local and remote start-stop control.
A phase line L11 of the control power supply is connected to a wire inlet end of a second normally open output contact MCU-3 of the low-voltage motor protection device; the outlet end of a second normally open output contact MCU-3 of the low-voltage motor protection device is connected with the coil inlet end of the breaker QF; a coil outlet end of the breaker QF is connected to a zero line N of the control power supply; the circuit enables the first normally closed output contact MCU-1 of the low-voltage motor protection device to be connected into the motor control circuit, the contactor KM and the circuit breaker QF can be quickly cut off, and the protection effect on the motor M is achieved.
The phase line L11 of the control power supply is connected to the incoming line end of the first normally open contact KA3-1 of the third relay; an outlet end of a first normally open contact KA3-1 of the third relay; the wire inlet ends are respectively connected with a first indicator light HR and a second indicator light 1 HR; leading-out ends of the first indicator light HR and the second indicator light 1HR are connected to a zero line N of the control power supply;
the phase line L11 of the control power supply is connected to the incoming line end of the first normally closed contact KA3-2 of the third relay; an outlet end of a first normally closed contact KA3-2 of the third relay; the wire inlet ends are respectively connected with the third indicator light HG and the fourth indicator light 1 HG; the outlet ends of the third indicator light HG and the fourth indicator light 1HG are connected to a zero line N of the control power supply; the circuit mainly plays a role of indicating light prompting.
And the control power supplies L11 and N supply power to the low-voltage motor protection device MCU, and supply power to the low-voltage motor protection device MCU.
In this embodiment, in order to protect the motor M, it is further necessary to connect input and output of signals at the low-voltage motor protection device MCU, and the la end, the lb end, the lc end, and the ln end of the low-voltage motor protection device MCU are respectively connected to the secondary side of the current transformer TD; for connecting a current signal;
a Ua end, a Ub end, a Uc end and a Un end of the low-voltage motor protection device MCU are respectively connected to a wire outlet end of the breaker QF; connecting a voltage signal;
the end S1 of the low-voltage motor protection device MCU is connected with a first contact QF-1 of the circuit breaker; the S2 end of the low-voltage motor protection device MCU is connected with a second normally open contact KA3-3 of a third relay; the monitoring device is mainly used for monitoring the state of the third relay and the state of the contactor KM; the S4 end of the low-voltage motor protection device MCU is connected with a second contact QF-2 of the circuit breaker; for monitoring the state of the circuit breaker QF; the S5 end of the low-voltage motor protection device MCU is connected with a third normally open contact DCS-3 of the remote control switch; for monitoring the state of the remote control switch; the end A of the low-voltage motor protection device MCU and the end B of the low-voltage motor protection device MCU are connected with a communication loop; for communicating with a remote control system.
A first normally open output contact MCU-2 of the low-voltage motor protection device is arranged between the R3 end and the CB2 end of the low-voltage motor protection device MCU, participates in the work of a motor control circuit, and is connected with the first normally open output contact MCU-2 of the low-voltage motor protection device in parallel to form remote start-stop control.
In the present embodiment, the contactor KM is a 3RT series contactor. The breaker QF is a 3VA series breaker. The low-voltage motor protection device MCU is an M512F-DE series low-voltage motor protection device.
The voltage of the low-voltage motor control circuit in the embodiment is 380V alternating current to control a 380V alternating current motor.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.
Claims (7)
1. A low voltage motor control circuit, comprising:
the circuit breaker is arranged on a main circuit of the low-voltage motor control circuit; one end of the circuit breaker is connected with mains supply; the other end of the breaker is connected with one end of the contactor;
the other end of the contactor is connected with a motor; a current transformer is arranged between the contactor and the motor;
the motor control circuit controls the on-off of the circuit breaker and the contactor;
the motor control circuit also comprises a low-voltage motor protection device for protecting the low-voltage motor control circuit;
and the remote control switch is arranged in the motor control circuit and is used for remotely controlling the starting of the motor.
2. The low-voltage motor control circuit as claimed in claim 1, wherein a control power supply is arranged in the motor control circuit and is connected to any phase of the outlet end of the circuit breaker;
one end of the commercial power is connected with one end of the normally closed contact of the test switch; the other end of the normally closed contact of the test switch is connected with one end of the normally open contact of the test switch; the other end of the normally open contact of the test switch is connected with a phase line of the control power supply;
the outlet end of the normally closed contact of the test switch is connected with the inlet end of the first normally open contact of the remote control switch and the inlet end of the second normally open contact of the remote control switch;
the wire outlet end of the first normally open contact of the remote control switch and the wire outlet end of the second normally open contact of the remote control switch are respectively the wire inlet end of the first relay coil and the wire inlet end of the second relay coil; the outlet end of the first relay coil and the outlet end of the second relay coil are connected with a zero line of a control power supply;
the phase line of the control power supply is respectively connected to the first end point of the change-over switch and the third end point of the change-over switch; the fourth end point of the change-over switch is connected with the wire inlet end of the first normally open button;
the second end point of the change-over switch is connected to the wire inlet end of the first normally open contact of the first relay; the wire outlet end of the first normally open button and the wire outlet end of the first normally open contact of the first relay are respectively connected to the wire inlet end of the first normally closed button; the wire outlet end of the first normally closed button is connected to the wire inlet end of the first normally closed contact of the second relay;
the wire outlet end of the first normally closed contact of the second relay is connected with the wire inlet end of the first normally closed output contact of the low-voltage motor protection device; the outlet end of the first normally closed output contact of the low-voltage motor protection device is respectively connected to the inlet end of the third relay coil and the inlet end of the contactor coil; the wire inlet end of the third relay coil and the wire outlet end of the contactor coil are connected to a zero line of a control power supply;
a first normally open contact of a contactor and a first normally open output contact of a low-voltage motor protection device are connected in parallel to a first normally open contact of a first relay and a first normally open button to form local and remote start-stop control;
a phase line of the control power supply is connected to a wire inlet end of a second normally open output contact of the low-voltage motor protection device; the outlet end of a second normally open output contact of the low-voltage motor protection device is connected with the coil inlet end of the circuit breaker; a coil outlet end of the circuit breaker is connected to a zero line of a control power supply;
a phase line of the control power supply is connected to a wire inlet end of a first normally open contact of the third relay; the outlet end of the first normally open contact of the third relay; the wire inlet ends are respectively connected with the first indicator light and the second indicator light; the wire outlet ends of the first indicator light and the second indicator light are connected to a zero line of the control power supply;
a phase line of the control power supply is connected to a wire inlet end of a first normally closed contact of the third relay; the outlet end of the first normally closed contact of the third relay; the wire inlet ends are respectively connected with the third indicator light and the fourth indicator light; the wire outlet ends of the third indicator light and the fourth indicator light are connected to a zero line of the control power supply;
and controlling a power supply to supply power to the low-voltage motor protection device.
3. The low-voltage motor control circuit according to claim 1, wherein a la terminal, an lb terminal, an lc terminal, and an ln terminal of the low-voltage motor protection device are respectively connected to a secondary side of the current transformer;
the Ua end, the Ub end, the Uc end and the Un end of the low-voltage motor protection device are respectively connected to the wire outlet end of the circuit breaker;
connecting a first contact of the circuit breaker to the end S1 of the low-voltage motor protection device; the end S2 of the low-voltage motor protection device is connected with a second normally open contact of a third relay; connecting a second contact of the circuit breaker to the end S4 of the low-voltage motor protection device; a third normally open contact of the remote control switch is connected to the end S5 of the low-voltage motor protection device; the end A of the low-voltage motor protection device and the end B of the low-voltage motor protection device are connected with a communication loop;
and a first normally open output contact of the low-voltage motor protection device is arranged between the R3 end and the CB2 end of the low-voltage motor protection device.
4. The low voltage motor control circuit of claim 1, wherein said contactor is a 3RT series contactor.
5. The low voltage motor control circuit of claim 1, wherein said circuit breaker is a 3VA series circuit breaker.
6. The low-voltage motor control circuit as claimed in claim 1, wherein said low-voltage motor protection device is a M512F-DE series low-voltage motor protection device.
7. The low-voltage motor control circuit according to any one of claims 1 to 6, wherein the voltage of the low-voltage motor control circuit is 380V AC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023001812.8U CN214124812U (en) | 2020-12-14 | 2020-12-14 | Low-voltage motor control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023001812.8U CN214124812U (en) | 2020-12-14 | 2020-12-14 | Low-voltage motor control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214124812U true CN214124812U (en) | 2021-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023001812.8U Active CN214124812U (en) | 2020-12-14 | 2020-12-14 | Low-voltage motor control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214124812U (en) |
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2020
- 2020-12-14 CN CN202023001812.8U patent/CN214124812U/en active Active
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