CN216956762U

CN216956762U - PLC detection circuit of remote control change-over switch

Info

Publication number: CN216956762U
Application number: CN202023320938.1U
Authority: CN
Inventors: 刘博�
Original assignee: Schneider Wingoal Tianjin Electric Equipment Co Ltd
Current assignee: Schneider Wingoal Tianjin Electric Equipment Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-07-12
Anticipated expiration: 2030-12-31

Abstract

The utility model provides a PLC detection circuit of a remote control change-over switch, which comprises a main loop and a control loop, wherein the main loop is connected with the control loop; the main loop comprises a contactor KM1, a contactor KM2 and a contactor KM3, the contactor KM1 and a contactor KM2, one end of the contactor KM3 is connected with an external power supply, a remote control change-over switch closing main coil is connected between two synchronous contacts of the contactor KM1, a remote control change-over switch auxiliary coil is connected between two synchronous contacts of the contactor KM2, and a remote control change-over switch double-split coil is connected between two synchronous contacts of the contactor KM 3; the control loop comprises an AC-DC (alternating current-direct current), a PLC (programmable logic controller), a KM1 control loop, a KM2 control loop, a KM3 control loop and a counting loop, one end of the AC-DC is connected with an external power supply, the other end of the AC-DC provides power for the PLC and the control loop, and the KM1 control loop, the KM2 control loop, the KM3 control loop and the counting loop are all connected to the PLC. The remote control change-over switch PLC detection circuit solves the problems that an existing RTSE life detection platform is complex in operation, and the collection and monitoring of protection functions and data are limited.

Description

PLC detection circuit of remote control change-over switch

Technical Field

The utility model belongs to the field of test circuits, and particularly relates to a PLC (programmable logic controller) detection circuit of a remote control change-over switch.

Background

At present, an RTSE (remote transfer switch) machine life detection platform is single in function, not flexible enough and not universal. The detection table is centralized, the size is large, the internal space is limited, and the whole movement is inconvenient. The detection logic is fixed, so that both line adjustment and logic program change are complicated once a new detection requirement is met, the protection function and data acquisition and monitoring are limited, and the new product research and development process is severely restricted.

Disclosure of Invention

In view of the above, the utility model provides a remote control transfer switch PLC detection circuit to solve the problems that the operation of the conventional RTSE (remote control transfer switch) life detection platform is complicated, and the acquisition and monitoring of the protection function and data are limited.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

the remote control change-over switch PLC detection circuit comprises a main loop and a control loop;

the main loop comprises a contactor KM1, a contactor KM2 and a contactor KM3, the contactor KM1 and the contactor KM2, one end of the contactor KM3 is connected with an external power supply, a remote control change-over switch main coil is connected between two synchronous contacts of the contactor KM1, a remote control change-over switch auxiliary coil is connected between two synchronous contacts of the contactor KM2, and a remote control change-over switch double-split coil is connected between two synchronous contacts of the contactor KM 3;

the control loop comprises an AC-DC (alternating current-direct current), a PLC (programmable logic controller), a KM1 control loop, a KM2 control loop, a KM3 control loop and a counting loop, one end of the AC-DC is connected with an external power supply, the other end of the AC-DC provides power for the PLC, the KM1 control loop, the KM2 control loop, the KM3 control loop and the counting loop, and the KM1 control loop, the KM2 control loop, the KM3 control loop and the counting loop are all connected to the PLC.

Further, one end of the contactor KM1, one end of the contactor KM2 and one end of the contactor KM3 are connected with one end of a breaker QF1, the other end of the breaker QF1 is connected with an external power supply, and a breaker QF2 is connected in series on a line between the AC-DC and the external power supply.

Furthermore, the KM1 control loop comprises a relay KA1, one end of a coil of the relay KA1 is connected with a port Q0 of the PLC, the other end of the coil of the relay KA1 is connected with a negative port DC24V, the other end of a coil of the KM1 is connected with one end of a normally open contact of the relay KA1, and the other end of the normally open contact of the relay KA1 is connected with a positive port DC 24V.

Furthermore, the KM2 control loop comprises a relay KA2, one end of a coil of the relay KA2 is connected with a port Q1 of the PLC, the other end of the coil of the relay KA2 is connected with a negative port DC24V, the other end of a coil of the KM2 is connected with one end of a normally open contact of the relay KA2, and the other end of the normally open contact of the relay KA2 is connected with a positive port DC 24V.

Furthermore, the KM3 control loop comprises a relay KA3, one end of a coil of the relay KA3 is connected with a port Q2 of the PLC, the other end of the coil of the relay KA3 is connected with a negative port DC24V, the other end of a coil of the KM3 is connected with one end of a normally open contact of the relay KA3, and the other end of the normally open contact of the relay KA3 is connected with a positive port DC 24V.

Furthermore, the counting loop comprises a main counting loop and a standby counting loop, and the main counting loop and the standby counting loop are both connected to the PLC.

Furthermore, the main counting loop comprises a relay KA5 and a micro switch SQ1 of a remote control change-over switch, one end of a coil of the relay KA5 is connected with a negative port of the DC24V, the other end of the coil of the relay KA5 is connected with one end of a micro switch SQ1 of the remote control change-over switch, the other end of a micro switch SQ1 of the remote control change-over switch is connected with a positive port of the DC24V, one end of a contact KA5 is connected with an I11 port of the PLC, and the other end of a contact KA5 is connected with a positive port of the DC 24V.

Furthermore, the standby counting loop comprises a relay KA6 and a micro switch SQ2 of a remote control change-over switch, one end of a coil of the relay KA6 is connected with a negative port of the DC24V, the other end of the coil of the relay KA6 is connected with one end of a micro switch SQ2 of the remote control change-over switch, the other end of a micro switch SQ2 of the remote control change-over switch is connected with a positive port of the DC24V, one end of a contact KA6 is connected with an I12 port of the PLC, and the other end of a contact KA6 is connected with a positive port of the DC 24V.

Further, an emergency stop button SE1 is further included, a normally closed contact of the button SE1 is connected in series with a line connecting the KM1 control loop, the KM2 control loop, the KM3 control loop and the counting loop with the AC-DC, and a normally open contact of the emergency stop button SE1 is connected in series with a line connecting the PLC and the AC-DC.

Compared with the prior art, the utility model has the following advantages:

(1) the remote control change-over switch PLC detection circuit realizes three states of main closing, double separating positions and standby closing of the switch by adopting a direct current motor positive and negative rotation mode inside the remote control change-over switch PLC detection circuit. Under the automatic operation mode, through detecting the fine motion feedback signal, the automatic recording switches the number of times, and the fine motion feedback signal establishes ties intermediate relay, has the anti-disturbance function, and the state that detects is more stable.

(2) The remote control change-over switch PLC detection circuit can make different detection schemes according to research and development requirements, saves a large amount of research and development time, and has the advantages of small circuit volume, low cost, higher reliability of components and flexible expansion.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic circuit diagram of a detection circuit of a remote control transfer switch PLC according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a main loop according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a control loop according to an embodiment of the present invention;

fig. 4 is a schematic view of a display interface of a touch screen according to an embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to 3, the detection circuit of the remote control transfer switch PLC includes a main circuit and a control circuit;

the main loop comprises a contactor KM1, a contactor KM2 and a contactor KM3, the contactor KM1 and a contactor KM2, one end of the contactor KM3 is connected with an external power supply, a remote control change-over switch closing main coil is connected between two synchronous contacts of the contactor KM1, a remote control change-over switch auxiliary coil is connected between two synchronous contacts of the contactor KM2, and a remote control change-over switch double-split coil is connected between two synchronous contacts of the contactor KM 3;

As shown in fig. 1 to 3, one end of each of the contactor KM1, the contactor KM2 and the contactor KM3 is connected to one end of a breaker QF1, the other end of the breaker QF1 is connected to an external power supply, and a breaker QF2 is connected in series to a line between the AC-DC and the external power supply.

As shown in fig. 1 to 3, the KM1 control loop includes a relay KA1, one end of a coil of the relay KA1 is connected with a Q0 port of the PLC, the other end of the coil of the relay KA1 is connected with a negative port of the DC24V, the other end of the coil of the KM1 is connected with one end of a normally open contact of the relay KA1, and the other end of the normally open contact of the relay KA1 is connected with a positive port of the DC 24V.

As shown in fig. 1 to 3, the KM2 control loop includes a relay KA2, one end of a coil of the relay KA2 is connected with a Q1 port of the PLC, the other end of the coil of the relay KA2 is connected with a negative port of the DC24V, the other end of the coil of the KM2 is connected with one end of a normally open contact of the relay KA2, and the other end of the normally open contact of the relay KA2 is connected with a positive port of the DC 24V.

As shown in fig. 1 to 3, the KM3 control loop includes a relay KA3, one end of a coil of the relay KA3 is connected with a Q2 port of the PLC, the other end of the coil of the relay KA3 is connected with a negative port of the DC24V, the other end of the coil of the KM3 is connected with one end of a normally open contact of the relay KA3, and the other end of the normally open contact of the relay KA3 is connected with a positive port of the DC 24V.

As shown in fig. 1 to fig. 3, the counting loop includes a master-slave counting loop and a slave-slave counting loop, and both the master-slave counting loop and the slave-slave counting loop are connected to the PLC.

As shown in fig. 1 to fig. 3, the main and combined counting loop comprises a relay KA5 and a microswitch SQ1 of a remote control change-over switch, one end of a coil of the relay KA5 is connected with a negative port of the DC24V, the other end of the coil of the relay KA5 is connected with one end of a microswitch SQ1 of the remote control change-over switch, the other end of a microswitch SQ1 of the remote control change-over switch is connected with a positive port of the DC24V, one end of a contact KA5 is connected with an I11 port of the PLC, and the other end of a contact KA5 is connected with a positive port of the DC 24V.

As shown in fig. 1 to fig. 3, the standby counting loop comprises a relay KA6 and a microswitch SQ2 of a remote control change-over switch, one end of a coil of the relay KA6 is connected with a negative port of the DC24V, the other end of the coil of the relay KA6 is connected with one end of a microswitch SQ2 of the remote control change-over switch, the other end of a microswitch SQ2 of the remote control change-over switch is connected with a positive port of the DC24V, one end of a contact KA6 is connected with a port I12 of the PLC, and the other end of a contact KA6 is connected with a positive port of the DC 24V.

As shown in fig. 1 to fig. 3, the intelligent power supply further comprises an emergency stop button SE1, wherein a normally closed contact of the button SE1 is connected in series with a line connecting the KM1 control loop, the KM2 control loop, the KM3 control loop and the counting loop with the AC-DC, and a normally open contact of the emergency stop button SE1 is connected in series with a line connecting the PLC with the AC-DC.

The machine life test platform of RTSE (remote control change-over switch) equipment has the advantages of low equipment cost, small volume, flexible control, clear display interface and stable system. A power distribution system diagram (shown in figure 1), a main circuit diagram (shown in figure 2) and a control circuit diagram (shown in figure 3). The logic controller is programmed according to the switching period of a remote control transfer switch (RTSE), the main loop is electrified by a DC12V through three contactors of KM1, KM2 and KM3 respectively, and the main loop is disconnected after being electrified for 2S every time, so that the motor is prevented from being electrified for a long time to increase locked-rotor current and influence the service life of the motor. According to the product switching requirement, the switch is electrified for 2S to reach a main switching-on position, a standby switching-on position and a double-division position. The logic program respectively controls the on-off sequence of the three contactors KM1, KM2 and KM3 according to the set time requirement, namely, a cycle is executed according to the period KM3 → KM1 → KM2 → KM3 → KM2 → KM1, and double detection of the three position states is realized in one cycle. The logic controller judges whether the switching state meets the design requirement by detecting whether the action command is consistent with the feedback signal, the switching value input and output signals are driven by a DC24V power supply, and a standby input and output interface is reserved in the control system, so that other functions can be expanded, and the detection and detection requirements of different equipment are met.

Key devices include TM241CEC 24T: the small-sized integrated logic controller has 14 paths of digital quantity input and 10 paths of digital quantity output; GXU 3512: 7 inch screen 65K color touch screen; DY: a general-purpose switching power supply 24V 5A, ABL8RPS 24050; KA 1-KA 6: DC24V relay, RXM4AB2BD (RXZE1M 4C); KM 1-KM 4 DC24V contactor, LC1DT20 BDC; SE1 scram button, ZBE-101.

The control flow comprises the following steps: a remote control transfer switch (RTSE) life detection circuit mainly detects three-position switches, namely a main closing state, a standby closing back closing state and a double-division state. A main loop of remote control transfer switch (RTSE) life detection is electrified with DC12V through three contactors of KM1, KM2 and KM3, the remote control transfer switch automatically switches three positions of main switch-on, double switch-off and standby switch-on, and whether the remote control transfer switch is normally switched successfully or not is judged by detecting the state of a micro-motion signal, so that the stability of the test equipment is verified. The program is in automatic state, at first closes two branch contactors KM2, and 2s circular telegram back, the default switch of system arrives two branch positions, detects whether the micro-motion signal of two branch positions meets the requirements in setting for the fault time, and whether meeting the requirements carries out next action according to setting for the shift time, and activate alarm signal, the program is stopped when not meeting the requirements. After the double-branch state is normally completed, a program closes a main switching-on contactor KM1, after the double-branch state is electrified for 2s, a system default switch reaches a main switching-on position, whether a micro signal of the main switching-on position meets the requirement or not is detected within set fault time, the next step of action is carried out according to set switching time when the micro signal meets the requirement, an alarm signal is activated when the micro signal does not meet the requirement, and the program is stopped. After the main switching-on state is normally finished, the program closes the standby switching-on contactor KM2, after the power is switched on for 2s, the default switch of the system reaches the standby switching-on position, whether a micro-motion signal of the standby switching-on position meets the requirement is detected within the set fault time, the next action is carried out according to the set switching time if the micro-motion signal meets the requirement, an alarm signal is activated if the micro-motion signal does not meet the requirement, and the program is stopped. After the standby switch-on is normally finished, the double-position-division-position action detection process, the standby switch-on action detection process and the main switch-on action detection process are completed in sequence, and the switch acts for one period according to the sequence of forward and reverse rotation of the motor, so that the detection of 2 times of main switch-on states, 2 times of standby switch-on states and 2 times of double-division states in one period is realized. The PLC controls the contactors KM1, KM2 and KM3 by controlling the intermediate relays KA1, KA2 and KA3, and the internal logics KA1, KA2 and KA3 have an interlocking function and cannot act simultaneously. A main closing SQ1 micro-motion signal and a standby closing SQ2 micro-motion signal of the RTSE equipment respectively feed back position signals to the PLC through intermediate relays KA5 and KA6, and the PLC judges whether the state of a switch position meets requirements or not by detecting output commands of KA1, KA2 and KA3 and the state of the micro-motion signals. KA1, KA2 and KA3 have a signal isolation function, play a role in micro-motion signal anti-interference, prevent the system from misjudging the position of a switch, and can record the action times of main closing, standby closing and double-division positions through the detection of SQ1 micro-motion signals and standby closing SQ2 micro-motion signals. The system judges the state of the switch by the time delay detection of the SQ1 micro-motion signal and the backup switch-on SQ2 micro-motion signal, when the micro-motion signal exceeds the set time delay, the system judges that the switch has a switch-on fault, the program is stopped, the switching times are recorded, and a fault alarm lamp prompt is given. When the switching failure reaches the set times, the system automatically stops running, and the system running lamp is normally turned off. The program can set the switching period and the fault detection time according to different requirements of products, and when the action time of the micro feedback signal detected in the switching process exceeds the fault detection time, the switching process is judged to fail, the automatic switching is stopped, and an alarm is given. The program peripheral has counting and fault resetting functions, and is convenient for designers to repeatedly verify the test equipment. The touchscreen display interface is shown in fig. 4.

The system is in an automatic running state, and the indicator light displays green; the system is in an automatic stop state and the indicator light shows grey. Automatic operation and stopping of the system are achieved by "start" and "stop" buttons, respectively.

When a fault occurs, the PLC program is stopped, and the fault indicating lamp displays yellow; when there is no fault, the indicator light displays gray.

The main switch-on channel and the indicator light display green; the main switch-on/off circuit and the indicator light show gray; preparing a closed passage, and displaying green by an indicator light; switching on and switching off, and displaying gray by an indicator light; the indicator lamp displays green by two branch channels; the double-branch circuit is broken, and the indicator light displays gray; setting switching as a target value of switching in an automatic state, and realizing automatic shutdown by comparing the actual times with the target value by the system; switching time, namely switching periods of three position states of the switch can be freely set according to design requirements and switching strength; the micro-motion fault delay can freely set the sampling time of the micro-motion feedback signal in the switching process according to the design requirement; and the reset function key has the functions of counting zero clearing and fault resetting.

The logic controller is internally programmed according to RTSE switching requirements, switching value input and output signals are driven by a DC24V power supply, and can share free matching combination to realize control requirements of different functions; the system performs reciprocating circular switching according to set time: double division → owner → equipment → double division → equipment → owner → double division. The system can judge the position of a switch by collecting a main switch-on SQ1 micro-motion signal and a standby switch-on SQ2 micro-motion signal of RTSE equipment. The states of PLC input points I11\ I12 are set and compared through delay time, whether a switch is closed in place or not is judged, the main action time, the standby action time and the double action time exceed delay set values, a fault is logically judged, switching is stopped, a touch screen operation indicator lamp is changed from green to grey, a fault lamp is changed from grey to yellow, and the actual switching times are recorded. And switching the operation to set times without faults and automatically stopping the operation. The method is characterized in that: a mounting support is fixed in the life distribution box, the PLC serves as a control core, control loops such as an alternating current switching power supply, a direct current switching power supply, an intermediate relay and a contactor are connected with the PLC, and the distribution box is provided with a touch screen on a panel and integrates functions of function state display, alarm display, control buttons, switching buttons and counting functions. The emergency stop button is independently arranged on the panel of the distribution box, so that an operator can conveniently overhaul the control loop, and accidents are prevented. The PLC control program sets the switching times and the switching time according to the requirements, and the PLC control program is set by the micro-motion fault delay, started by one key and automatically stopped. The logic for judging the fault according to the delay of the micromotion fault has a fault shutdown protection function, and the circuit and the control program of the TM241CEC24T part are expected to be protected.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. Remote control change over switch PLC detection circuitry, its characterized in that: comprises a main loop and a control loop;

the control loops comprise an AC-DC (alternating current-direct current), a PLC (programmable logic controller), a KM1 control loop, a KM2 control loop, a KM3 control loop and a counting loop, one end of the AC-DC is connected with an external power supply, the other end of the AC-DC provides power for the PLC, the KM1 control loop, the KM2 control loop, the KM3 control loop and the counting loop, and the KM1 control loop, the KM2 control loop, the KM3 control loop and the counting loop are all connected to the PLC.

2. The remote transfer switch PLC detection circuit of claim 1, wherein: one ends of the contactor KM1, the contactor KM2 and the contactor KM3 are all connected with one end of a breaker QF1, the other end of the breaker QF1 is connected with an external power supply, and a breaker QF2 is connected in series on a line between the AC-DC and the external power supply.

3. The remote transfer switch PLC detection circuit of claim 1, wherein: the KM1 control loop comprises a relay KA1, one end of a coil of the relay KA1 is connected with a port Q0 of the PLC, the other end of the coil of the relay KA1 is connected with a negative port DC24V, the other end of a coil of the KM1 is connected with one end of a normally open contact of the relay KA1, and the other end of the normally open contact of the relay KA1 is connected with a positive port DC 24V.

4. The remote transfer switch PLC detection circuit of claim 1, wherein: the KM2 control loop comprises a relay KA2, one end of a coil of the relay KA2 is connected with a port Q1 of the PLC, the other end of the coil of the relay KA2 is connected with a negative port DC24V, the other end of a coil of the KM2 is connected with one end of a normally open contact of the relay KA2, and the other end of the normally open contact of the relay KA2 is connected with a positive port DC 24V.

5. The remote transfer switch PLC detection circuit of claim 1, wherein: the KM3 control loop comprises a relay KA3, one end of a coil of the relay KA3 is connected with a port Q2 of the PLC, the other end of the coil of the relay KA3 is connected with a negative port DC24V, the other end of a coil of the KM3 is connected with one end of a normally open contact of the relay KA3, and the other end of the normally open contact of the relay KA3 is connected with a positive port DC 24V.

6. The remote transfer switch PLC detection circuit of claim 1, wherein: the counting loop comprises a main combined counting loop and a standby combined counting loop, and the main combined counting loop and the standby combined counting loop are connected to the PLC.

7. The remote transfer switch PLC detection circuit of claim 6, wherein: the main counting loop comprises a relay KA5 and a microswitch SQ1 of a remote control change-over switch, one end of a coil of the relay KA5 is connected with a DC24V negative electrode port, the other end of the coil of the relay KA5 is connected with one end of a microswitch SQ1 of the remote control change-over switch, the other end of the microswitch SQ1 of the remote control change-over switch is connected with a DC24V positive electrode port, one end of a contact KA5 is connected with a PLC input port, and the other end of the contact KA5 is connected with a DC24V positive electrode port.

8. The remote transfer switch PLC detection circuit of claim 6, wherein: the standby counting loop comprises a relay KA6 and a microswitch SQ2 of a remote control change-over switch, one end of a coil of the relay KA6 is connected with a DC24V negative electrode port, the other end of the coil of the relay KA6 is connected with one end of a microswitch SQ2 of the remote control change-over switch, the other end of the microswitch SQ2 of the remote control change-over switch is connected with a DC24V positive electrode port, one end of a KA6 contact is connected with a PLC input port, and the other end of a KA6 contact is connected with a DC24V positive electrode port.

9. The remote transfer switch PLC detection circuit of claim 1, wherein: the system also comprises an emergency stop button SE1, wherein a normally closed contact of the button SE1 is connected in series with a line connecting the KM1 control loop, the KM2 control loop, the KM3 control loop and the counting loop with the AC-DC, and a normally open contact of the emergency stop button SE1 is connected in series with a line connecting the PLC with the AC-DC.