CN211481175U - Utilize PLC control motor star triangle starting circuit - Google Patents
Utilize PLC control motor star triangle starting circuit Download PDFInfo
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- CN211481175U CN211481175U CN201922215962.XU CN201922215962U CN211481175U CN 211481175 U CN211481175 U CN 211481175U CN 201922215962 U CN201922215962 U CN 201922215962U CN 211481175 U CN211481175 U CN 211481175U
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Abstract
The utility model discloses an utilize PLC control motor star triangle starting circuit, including three-phase motor, PLC, star AC contactor and triangle-shaped AC contactor, the inlet wire post of three-phase motor is connected with the power electricity, the outlet wire post of three-phase motor is connected with the first end electricity of star AC contactor normally open contact, the second end short circuit of star AC contactor normally open contact; the three-phase motor outlet post is electrically connected with the three-phase motor inlet post through a triangular alternating current contactor, and the three-phase outlet wiring post is connected with the three-phase inlet wiring post; the power supply end of the PLC is electrically connected with any one of the three-phase power supplies; the signal input end of the PLC is respectively and electrically connected with the start button, the stop button and the normally closed contact of the thermal relay; and the electromagnetic coil of the triangular alternating current contactor and the electromagnetic coil of the star-shaped alternating current contactor are electrically connected with the signal output end of the PLC. The PLC is used for controlling the motor to start in a star connection mode, the motor runs in a triangle connection mode after delaying for a certain time, and the delay time is accurately controlled.
Description
Technical Field
The utility model relates to an electric automatization field, concretely relates to utilize PLC control motor star triangle starting circuit.
Background
The three-phase asynchronous motor is an induction motor, is powered by a 380V three-phase alternating current power supply, and the rotating speed of a rotor of the three-phase asynchronous motor is lower than that of a rotating magnetic field, so that the rotor and the rotating magnetic field move relatively to generate electromagnetic torque so as to generate rotation.
If the three-phase asynchronous motor is directly connected into a three-phase circuit through a delta connection method, the starting instantaneous current can reach 5-7 times of the rated current when the three-phase asynchronous motor is started, the three-phase asynchronous motor can be damaged, the whole power grid can be greatly impacted, and other equipment in the power grid is influenced and damaged. If the three-phase motor adopts a star connection access circuit, although the impact of starting current on a power grid can be reduced, the requirement of rotating speed cannot be met in the operating stage of the three-phase motor.
In order to solve the above problems, the industry currently adopts a star-delta step-down starting method to start a three-phase motor, and the principle is as follows: in the starting stage, a star connection method is adopted, the starting current is reduced, and the motor is changed into a delta connection method after being started, so that the rotating speed of the motor meets the requirement.
The existing star-delta voltage reduction starting method generally adopts a time relay, namely, the time relay is arranged in a starting circuit, and after a motor is started through a delta connection method and delayed for a certain time, a system is changed into a star connection method to operate. However, the time relay has poor control on time precision, large delay error and cannot accurately delay time, so that connection conversion is too early or too late.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned technical problem, proposed following technical scheme:
in a first aspect, an embodiment of the present invention provides a star-delta starting circuit for controlling a motor by using a PLC, including a three-phase motor, a PLC, a star-shaped ac contactor, and a triangular ac contactor, wherein a three-phase incoming line column of the three-phase motor is electrically connected to a three-phase power supply, a three-phase outgoing line column of the three-phase motor is electrically connected to a first end of a normally open contact of the star-shaped ac contactor, and each outgoing line end of a second end of the normally open contact of the star-shaped ac contactor is short-circuited; the three-phase motor outlet post is electrically connected with the three-phase motor inlet post through a normally open contact of the triangular alternating current contactor, and the three-phase outlet wiring post is connected with the three-phase inlet post;
the power supply end of the PLC is electrically connected with any one of the three-phase power supplies; the signal input end of the PLC is respectively and electrically connected with the start button, the stop button and the normally closed contact of the thermal relay; a first end of a normally closed contact of the star-shaped alternating current contactor is electrically connected with a fourth signal output end of the PLC through an electromagnetic coil of the triangular alternating current contactor, and a second end of the normally closed contact of the star-shaped alternating current contactor is connected with a power supply neutral point; and the first end of the normally closed contact of the triangular alternating current contactor is electrically connected with the third signal output end of the PLC through the electromagnetic coil of the star alternating current contactor, and the second end of the normally closed contact of the triangular alternating current contactor is connected with a power supply neutral point.
By adopting the implementation mode, the PLC output signal is used for controlling the three-phase motor to start according to the star connection method, the signal is output after the internal program of the PLC delays for a certain time to control the star circuit to be disconnected and the triangle circuit to be closed, the three-phase motor operates in the triangle connection method, the PLC can control the delay time to be high in precision, and the problem that the connection method is too early or too late due to delay errors is avoided.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the three-phase wire inlet pole of the three-phase motor is electrically connected to the corresponding three-phase power supply through a normally open contact of the main circuit ac contactor.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, one end of the main circuit ac contactor electromagnetic coil is electrically connected to the second signal output end of the PLC, and the other end of the main circuit ac contactor electromagnetic coil is electrically connected to a power supply neutral point.
By adopting the implementation mode, the main circuit alternating current contactor is arranged, and the on-off of the main circuit alternating current contactor can be controlled through the PLC, so that the on-off of the three-phase motor is controlled.
With reference to the first aspect, in a third possible implementation manner of the first aspect, an incoming line end of the PLC power supply is electrically connected to any one of the three-phase power supplies, and an outgoing line end of the PLC power supply is electrically connected to a neutral point of the three-phase power supply.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, a control circuit fuse is disposed between the incoming line terminal of the PLC power supply and the three-phase power supply.
By adopting the implementation mode, the PLC is supplied by single-phase electricity, the single-phase power supply to the PLC can be realized only by connecting the PLC between any phase of the three-phase power supply and a neutral point, and the safety use of the PLC is ensured by connecting the fuse of the control circuit between the incoming line end of the PLC power supply and the power supply.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the first signal output end of the PLC is electrically connected to one end of an indicator light, and the other end of the indicator light is electrically connected to a power supply neutral point.
By adopting the implementation mode, the indicator lamp can indicate the starting process of the three-phase motor and send out an alarm signal.
With reference to the first aspect, in a sixth possible implementation manner of the first aspect, a circuit breaker is disposed between the normally open contact of the main circuit ac contactor and the three-phase power supply, and a main circuit fuse is disposed between the circuit breaker and the normally open contact of the main circuit ac contactor.
With reference to the first aspect, in a seventh possible implementation manner of the first aspect, a thermal relay is disposed between a normally-open contact of the main circuit ac contactor and a three-phase wire inlet pole of the three-phase motor.
In a second aspect, an embodiment of the present invention provides a method for controlling a star-delta motor by using a PLC, the method includes:
(1) manually closing the circuit breaker;
(2) manually pressing a start button of a PLC signal input end;
(3) a first signal output end, a second signal output end and a third signal output end of the PLC output electric signals, and the indicator lamp is powered on; the electromagnetic coil of the main circuit alternating current contactor is electrified, and the normally open contact of the main circuit alternating current contactor is closed; the electromagnetic coil of the star-shaped alternating current contactor is electrified, the normally open contact of the star-shaped alternating current contactor is closed, and the motor is started in a star connection method;
(4) after the PLC delays the time set by the internal program, a first signal output end and a second signal output end of the PLC output electric signals, and the indicator light is electrified and kept bright; the electromagnetic coil of the main circuit alternating current contactor is electrified, and the normally open contact of the main circuit alternating current contactor is kept closed; when the electromagnetic coil of the star-shaped alternating current contactor loses power, the normally open contact of the star-shaped alternating current contactor is disconnected;
(5) after the PLC delays the time set by the internal program again, a second signal output end and a fourth signal output end of the PLC output electric signals, and the indicator light is turned off when power is lost; the electromagnetic coil of the main circuit alternating current contactor is electrified, and the normally open contact of the main circuit alternating current contactor is kept closed; the electromagnetic coil of the triangular alternating current contactor is electrified, the normally open contact of the triangular alternating current contactor is closed, and the motor operates in a triangular connection mode.
Drawings
Fig. 1 is a schematic diagram of a star-delta starting circuit for controlling a motor by using a PLC according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for controlling a star-delta start of a motor by using a PLC according to an embodiment of the present invention;
fig. 3 is a ladder diagram of a PLC program according to an embodiment of the present invention.
In FIGS. 1-3: QS-circuit breaker, FU1-main circuit fuse, KM0Main circuit ac contactor, KM0-1Main circuit ac contactor normally open contact, FR-thermal relay, KM1Star ac contactor, KM1-1Star ac contactor normally open contact, KM1-2Normally closed contact of star ac contactor, KM2Triangular AC contactor, KM2-1Normally open contact of triangular ac contactor, KM2-2Normally closed contacts of a triangular ac contactor, M-three-phase motor, HL-indicator light, U1A first terminal, V1A second feed leg, W1A first terminal, U2A second outlet leg, V2A second outlet leg, W2-a second outlet leg, an L-PLC power inlet terminal, an N-PLC power outlet terminal, a COM-PLC male terminalCommon terminal, X0-a first signal input, X1-a second signal input, X2-a third signal input terminal, Y0-a first signal output terminal, Y1-a second signal output terminal, Y2-a second signal output terminal, Y3-a third signal output, SB1A stop button, SB2-start button, FU1Main circuit fuse, FU2-a control circuit fuse.
Detailed Description
The present invention will be described with reference to the accompanying drawings and embodiments.
Fig. 1 is a schematic diagram of a star-delta starting circuit for controlling a motor by using a PLC according to an embodiment of the present invention, which includes a three-phase motor M, PLC, a star-shaped ac contactor KM1And a main circuit part and a control circuit part which are composed of a triangular alternating current contactor and a triangular alternating current contactor, wherein:
the main circuit part comprises a three-phase motor M and a first wire inlet post U of the three-phase motor M1The second wire inlet column V1And a third wire inlet pole W1The three-phase power supply is respectively connected with the phase A, the phase B and the phase C of the three-phase power supply correspondingly and is used for supplying power. In order to control the power-on and power-off of the motor and ensure the safety of the system, a circuit breaker QS is electrically connected between the inlet wire end of the three-phase motor M and the three-phase power supply, and a main circuit fuse FU is electrically connected between the circuit breaker QS and the inlet wire end of the three-phase motor M1In the main circuit fuse FU1A normally open contact KM of a main circuit AC contactor is electrically connected between the three-phase motor M and the inlet wire end0-1In the main circuit AC contactor normally open contact KM0-1And a thermal relay FR is electrically connected between the three-phase motor M and the wire inlet end. By controlling circuit breaker QS and main circuit AC contactor normally open contact KM0-1Controlling the on-off of the motor M, when the current is too large or the system is overloaded, the main circuit fuse FU1And the thermal relay FR automatically disconnects the main circuit to protect the safety of the system.
To achieve a star start, the first outlet leg U of the motor M of this embodiment2And the second outlet column V2And the third wire outlet pole W2Normally open contact KM of star AC contactor1-1Is electrically connected with the first end of the star-shaped alternating current contactor, and a normally open contact KM of the star-shaped alternating current contactor1-1Is shorted.
Further, in order to realize the delta connection of the three-phase motor M, the present embodiment connects the outgoing line end and the incoming line end of the three-phase motor M by phase change, that is, the first incoming line post U1And a third wire outlet column W2Electric connection, second wire-inlet pole V1And the first outlet post U2Electrical connection, third wire-feed stud W1And a second outlet column V2And (6) electrically connecting. A normally open contact KM of a triangular alternating current contactor is electrically connected to a connecting circuit between a wire inlet end and a wire outlet end of the three-phase motor M2-1By adopting the connection mode, the normally open contact KM of the star AC contactor of the star connection circuit of the three-phase motor M outlet end1-1Normally open contact KM of triangular alternating current contactor2-1The delta connection can be realized.
Further, in order to realize the switching of the star-delta connection method and ensure accurate delay switching, the embodiment adopts the PLC for control, and because the PLC only needs single-phase power supply, the inlet terminal L of the PLC power supply is electrically connected with any phase of the A, B, C three-phase power supply, and the outlet terminal N of the PLC power supply is electrically connected with the neutral point of the three-phase power supply. In order to ensure the safety of the PLC circuit, a control circuit fuse FU is electrically connected between the PLC power supply incoming line end and the three-phase power supply2. And a common end COM of the PLC is electrically connected with a PLC power supply incoming line end L.
In order to realize the automatic alarm when the PLC controls the starting and stopping of the motor and the overload, the control button and the thermal relay FR of the embodiment input a control signal to the PLC, and the stop button SB1The first end of the PLC is electrically connected with a common end COM of the PLC, and the second end of the PLC is electrically connected with a second signal input end X1(ii) a Start button SB2The first end of the PLC is electrically connected with a common end COM of the PLC, and the second end of the PLC is electrically connected with a third signal input end X2(ii) a The first end of the normally closed contact of the thermal relay FR is electrically connected with the common end COM of the PLC, and the second end is electrically connected with the first signal input end X0。
For controlling the closing of each AC contactor by PLC output signalAnd the PLC of the embodiment is provided with a plurality of signal output ends, and each signal output end can output an electric signal according to the control of the internal program of the PLC. First signal output terminal Y0Is electrically connected with the first end of the indicator lamp HL, the second end of the indicator lamp HL is electrically connected with the neutral point of the power supply, when the first signal output end Y0The indicator light can be lighted when the electric signal is output. Second signal output terminal Y1AC contactor KM with main circuit0The first end of the electromagnetic coil is electrically connected with a main circuit alternating current contactor KM0The second end of the electromagnetic coil is electrically connected with a power supply neutral point, and when the second signal output end Y is connected with the power supply neutral point1When outputting electric signal, main circuit AC contactor KM0The electromagnetic coil is electrified, and the main circuit AC contactor normally-open contact KM0-1Closing of (3). Third signal output terminal Y2Star-shaped AC contactor KM1The first end of the electromagnetic coil is electrically connected with a star-shaped alternating current contactor KM1The second end of the electromagnetic coil and the normally closed contact KM of the triangular alternating current contactor2-2Is electrically connected with the first end of the triangular alternating current contactor, and the normally closed contact KM of the triangular alternating current contactor2-2Is electrically connected to the power supply neutral. Fourth signal output terminal Y3Triangular AC contactor KM2The first end of the electromagnetic coil is electrically connected with a triangular alternating current contactor KM2The second end of the electromagnetic coil is connected with a normally closed contact KM of a star-shaped alternating current contactor1-2Is electrically connected with the first end of the star-shaped AC contactor, and the normally closed contact KM of the star-shaped AC contactor1-2Is electrically connected to the power supply neutral.
According to the embodiments, the embodiment provides a star-delta starting circuit for controlling a motor by using a PLC, and the star-delta starting circuit comprises a three-phase motor M, PLC and a star-shaped ac contactor KM1And triangular AC contactor KM2Three incoming columns of the three-phase motor M are respectively connected with a three-phase power supply in an energized manner, and three outgoing columns of the three-phase motor M are connected with a normally open contact KM of a star-shaped alternating current contactor1-1Is electrically connected with the first end of the star-shaped alternating current contactor, and a normally open contact KM of the star-shaped alternating current contactor1-1The second end of the short circuit is short-circuited; the outlet pole of the three-phase motor K is through the normally open contact KM of the triangular AC contactor2-1Is electrically connected with the wire inlet post of the three-phase motor M,the three-phase outlet column is connected with the three-phase inlet column; the power supply end of the PLC is electrically connected with any one of the three-phase power supplies; PLC's signal input part respectively with start button SB2Stop button SB1The normally closed contact of the thermal relay FR is electrically connected; triangular alternating current contactor KM2Electromagnetic coil and star-shaped alternating current contactor KM1The electromagnetic coils are electrically connected with the signal output end of the PLC. The PLC is used for controlling the motor to start in a star connection mode, the motor runs in a triangle connection mode after delaying for a certain time, and the delay time is accurately controlled.
Corresponding with the utility model provides an utilize PLC control motor star triangle starting circuit, the utility model also provides an utilize the embodiment of PLC control motor star triangle starting method, as shown in fig. 2, the method includes:
(1) the circuit breaker QS is closed manually.
(2) Start button SB for manually pressing PLC signal input end2。
(3) First signal output end Y of PLC0And a second signal output terminal Y1And a third signal output terminal Y2Outputting an electric signal, and lighting an indicator lamp HL; main circuit AC contactor KM0The electromagnetic coil is electrified, and the main circuit AC contactor normally-open contact KM0-1Closing; star-shaped AC contactor KM1The electromagnetic coil is electrified, and the star-shaped AC contactor normally-open contact KM1-1Closed, the three-phase motor M is started in star connection.
The start button SB is shown in the ladder diagram of the PLC program in FIG. 32After pressing, PLC starts to operate, K is added7To a word combination K1Y000The first signal output terminal Y0And a second signal output terminal Y1And a third signal output terminal Y2An output electric signal, an indicator lamp HL, a main circuit AC contactor KM0Electromagnetic coil and star-shaped ac contactor KM1The electromagnetic coils are all electrified.
(4) After the PLC delays the time set by the internal program, the first signal output end Y0And a second signal output terminal Y1Output electric signal, indicator lamp HLThe electricity is kept bright; main circuit AC contactor KM0The electromagnetic coil is electrified, and the main circuit AC contactor normally-open contact KM0-1Keeping closed; star-shaped AC contactor KM1The electromagnetic coil is in power failure, and the star-shaped AC contactor normally-open contact KM1-1And (5) disconnecting.
After PLC operation is delayed for 10s, K3To a word combination K1Y000At this time, only the first signal output terminal Y is provided0And a second signal output terminal Y1Output electric signal, the other signal output ends do not output electric signal, indicator lamp HL and main circuit AC contactor KM0The electromagnetic coil is electrified, and the star-shaped AC contactor KM1The electromagnetic coil is de-energized.
(5) After the PLC delays the time set by the internal program again, the second signal output end Y of the PLC1And a fourth signal output terminal Y4Outputting an electric signal, and extinguishing the indicator lamp HL after losing power; main circuit AC contactor KM0The electromagnetic coil is electrified, and the main circuit AC contactor normally-open contact KM0-1Keeping closed; triangular alternating current contactor KM2The electromagnetic coil is electrified, and the normally open contact KM of the triangular alternating current contactor2-1Closed, the three-phase motor M operates in delta connection.
After PLC operation is delayed for 1s again, K10To a word combination K1Y000At this time, the second signal output terminal Y1And a fourth signal output terminal Y4Output electric signal, main circuit AC contactor KM0Electromagnetic coil and triangular AC contactor KM2The electromagnetic coil is electrified, and the indicator light is not electrified.
In the starting process, when the star-shaped alternating current contactor KM1When the electromagnetic coil is electrified, the normally closed contact KM of the star-shaped AC contactor1-2When the triangular alternating current contactor KM is disconnected2When the electromagnetic coil is electrified, the normally closed contact KM of the triangular alternating current contactor2-2The switching-off is carried out, thus forming an interlocking mechanism and ensuring the normally open contact KM of the star AC contactor1-1And a triangle AC contactor normally open contact KM2-1And will not close at the same time causing a short circuit.
When stoppingWhen the three-phase motor M is in operation, the stop button SB is pressed1PLC operation, K0To a word combination K1Y000And each signal output end has no power signal output, the electromagnetic coils of each alternating current contactor have power loss, and the three-phase motor M cannot be powered on and stops running.
When overload occurs, the normally closed contact of the thermal relay FR is disconnected, PLC operation, K1To a word combination K1Y000The first signal output terminal Y0An electric signal is output, and the indicator lamp HL is normally on to send out an alarm signal.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Of course, the above description is not limited to the above examples, and technical features of the present invention that are not described in the present application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only used for illustrating the technical solutions of the present invention and are not intended to limit the present invention, and if it is replaced, the present invention is only combined with and described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the claims of the present invention.
Claims (8)
1. The utility model provides an utilize PLC control motor star triangle starting circuit which characterized in that: the three-phase alternating current contactor comprises a three-phase motor, a PLC, a star alternating current contactor and a triangular alternating current contactor, wherein a three-phase incoming line column of the three-phase motor is respectively connected with a three-phase power supply in an corresponding electric mode, a three-phase outgoing line column of the three-phase motor is electrically connected with a first end of a normally open contact of the star alternating current contactor, and outgoing line ends of a second end of the normally open contact of the star alternating current contactor are in short circuit; the three-phase motor outlet post is electrically connected with the three-phase motor inlet post through a normally open contact of the triangular alternating current contactor, and the three-phase outlet wiring post is connected with the three-phase inlet post;
the power supply end of the PLC is electrically connected with any one of the three-phase power supplies; the signal input end of the PLC is respectively and electrically connected with the start button, the stop button and the normally closed contact of the thermal relay; a first end of a normally closed contact of the star-shaped alternating current contactor is electrically connected with a fourth signal output end of the PLC through an electromagnetic coil of the triangular alternating current contactor, and a second end of the normally closed contact of the star-shaped alternating current contactor is connected with a power supply neutral point; and the first end of the normally closed contact of the triangular alternating current contactor is electrically connected with the third signal output end of the PLC through the electromagnetic coil of the star alternating current contactor, and the second end of the normally closed contact of the triangular alternating current contactor is connected with a power supply neutral point.
2. The star-delta start circuit for controlling a motor by means of a PLC according to claim 1, wherein: and the three-phase wire inlet column of the three-phase motor is respectively connected with the three-phase power supply in a corresponding and electric mode through a normally open contact of the main circuit alternating current contactor.
3. The star-delta start circuit for controlling a motor by means of a PLC according to claim 2, wherein: one end of the electromagnetic coil of the main circuit alternating current contactor is electrically connected with the second signal output end of the PLC, and the other end of the electromagnetic coil of the main circuit alternating current contactor is electrically connected with a power supply neutral point.
4. The star-delta start circuit for controlling a motor by means of a PLC according to claim 1, wherein: the inlet wire end of the PLC power supply is electrically connected with any one of the three phases of the power supply, and the outlet wire end of the PLC power supply is electrically connected with the neutral point of the three-phase power supply.
5. The star-delta start circuit for controlling a motor by means of a PLC according to claim 4, wherein: and a control circuit fuse is arranged between the incoming line end of the PLC power supply and the three-phase power supply.
6. The star-delta start circuit for controlling a motor by means of a PLC according to claim 1, wherein: the first signal output end of the PLC is electrically connected with one end of an indicator light, and the other end of the indicator light is electrically connected with a power supply neutral point.
7. The star-delta start circuit for controlling a motor by means of a PLC according to claim 2, wherein: a circuit breaker is arranged between the normally open contact of the main circuit alternating current contactor and the three-phase power supply, and a main circuit fuse is arranged between the circuit breaker and the normally open contact of the main circuit alternating current contactor.
8. The star-delta start circuit for controlling a motor by means of a PLC according to claim 2, wherein: and a thermal relay is arranged between a normally open contact of the main circuit alternating current contactor and a three-phase wire inlet column of the three-phase motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922215962.XU CN211481175U (en) | 2019-12-12 | 2019-12-12 | Utilize PLC control motor star triangle starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922215962.XU CN211481175U (en) | 2019-12-12 | 2019-12-12 | Utilize PLC control motor star triangle starting circuit |
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| Publication Number | Publication Date |
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| CN211481175U true CN211481175U (en) | 2020-09-11 |
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| CN201922215962.XU Expired - Fee Related CN211481175U (en) | 2019-12-12 | 2019-12-12 | Utilize PLC control motor star triangle starting circuit |
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| CN (1) | CN211481175U (en) |
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