CN112379664A - Automatic fault diagnosis method for electric valve in electric system - Google Patents
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- 238000013024 troubleshooting Methods 0.000 abstract description 4
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
- G05B23/0262—Confirmation of fault detection, e.g. extra checks to confirm that a failure has indeed occurred
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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Abstract
The invention discloses an automatic fault diagnosis method for an electric valve in an electric system, and belongs to the technical field of electric automation control. In an electric system loop, the combination configuration of feedback points is optimized, an automatic identification detection module is combined, accurate fault points are rapidly given, and rapid troubleshooting of fault reasons is realized, so that the overhauling efficiency is improved, the overhauling performance of an electric valve in an electric control system is improved, and the feasibility of automatic fault diagnosis of the electric valve in the electric control system is realized.
Description
Technical Field
The invention relates to a fault diagnosis method, in particular to an automatic fault diagnosis method for an electric valve in an electric system, and belongs to the technical field of electric automation control.
Background
At present, the oil exploitation work has better realized automated control, which makes each drilling equipment and tool get wider and better utilization in production application. Among them, automation of the electrical system is essential to ensure smooth progress of mining work.
In order to improve the safety and reliability of the control electrical system, devices such as an intermediate relay, an alternating current contactor and the like are adopted among the loops for isolation protection. Therefore, when the equipment in the electrical system is abnormally executed, the existing obstacle probability is high, manual work is needed to check one by one, and a real fault point is confirmed. With the development of electrical systems towards intellectualization, unmanned, large-scale and other directions, the defect of completely depending on manual inspection of fault points is increasingly prominent, and the related problems include: the larger the scale of the electric system is, the longer the inspection time is, so that the maintenance efficiency is low; even if the problem that the operation of the electrical system is not influenced occurs, the system needs to be stopped to wait for manual confirmation, and the system operation efficiency is low.
The electric valve in the electric system mainly realizes the functions of cutting off and opening the manifold, and two control signals of opening and closing are introduced from the functional point of view, and two signals of opening in place and closing in place are fed back, so that the use requirement of the system can be met (as shown in figures 1-2). The electric valve can realize the preset function of the electric valve, but the equipment has low maintainability, which is not beneficial to fast troubleshooting of fault points; in addition, control signals and feedback signals related to the electric valve are transmitted through an intermediate relay, an alternating current contactor, a valve terminal, a PLC input/output terminal and the like, once the signals are abnormal, the link of a real fault point cannot be determined, and the quick elimination of the fault point is not facilitated for an operator.
Therefore, in order to meet the new requirements of the development of the electrical system, an automatic fault diagnosis method for an electric valve in the electrical system is urgently needed to effectively ensure the intelligent operation efficiency of the electrical system.
In 2018, 03 and 27, a patent document with publication number CN207148659U and name "an automatic pump pit leakage prevention control system" is disclosed, wherein the patent document specifically discloses: the device comprises a PLC (programmable logic controller), a pump pit liquid level detection switch, a pump pit sewage discharge motor, a filter cloth rotary disc filter equipment motor, a water pump motor, an electric valve, an intermediate relay, a manual switch and a contactor; the output end of the pump pit liquid level detection switch is connected with the digital quantity input end of the PLC; the switching value output end of the PLC is connected with a coil of a contactor, and a main contact of the contactor is connected in series in a power supply loop of a pump pit pollution discharge motor and a filter cloth rotary disc filter equipment motor; and the switching value output end of the PLC is connected with a coil of an intermediate relay, and a contact of the intermediate relay is connected in series in a power supply loop of the electric valve. The control system has the advantages of reasonable design, simple and compact structure, convenient operation, high automation degree and high control efficiency. In this patent document, the automatic control of leakage prevention of the pump pit is mainly used, and automatic diagnosis of a failure is not mentioned.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a fault automatic diagnosis method for an electric valve in an electric system. According to the technical scheme, in an electric system loop, the combined configuration of feedback points is optimized, an automatic identification detection module is combined, accurate fault points are quickly given, and quick troubleshooting of fault reasons is realized, so that the overhauling efficiency is improved, the overhauling performance of an electric valve in an electric control system is improved, and the feasibility of automatic fault diagnosis of the electric valve in the electric control system is realized.
In order to achieve the technical purpose, the following technical scheme is proposed:
the technical scheme provides an automatic fault diagnosis system for an electric valve in an electric system, which is arranged in an electric valve control system, wherein the electric valve control system comprises a PLC (programmable logic controller), an intermediate relay, an alternating current contactor and an electric valve, the output end of the PLC is connected with a contact of the intermediate relay, the other contact of the intermediate relay is connected with the alternating current contactor, the alternating current contactor is connected with a terminal of the electric valve, and a circuit for real-time control and feedback monitoring of the electric valve is formed among the PLC, the intermediate relay, the alternating current contactor and the electric valve;
the fault automatic diagnosis system comprises a fault identification module and an operation interface arranged on a PLC (programmable logic controller), wherein the fault identification module is connected with the operation interface and comprises an electric valve real-time opening detection module, an electric valve electrifying detection module, a PLC opening instruction detection module and a PLC closing instruction detection module;
in the real-time opening detection module of the electric valve, valve position feedback current (+)) and valve position feedback current (-)) in a terminal of an electric valve actuator are respectively connected to a PLC controller analog input module, and the electric valve realizes real-time monitoring of the valve position by reading the feedback current in real time;
in the electric valve electrifying detection module, the electric valve is connected with a 380VAC power supply, the PLC controller controls an intermediate relay, and the intermediate relay controls an alternating current contactor, so that the electrification control of the electric valve is realized; the alternating current contactor is additionally provided with a feedback contact, a 24VDC power supply is connected to one end of a normally open contact, the other end of the contact is connected with an input point of a PLC (programmable logic controller), when the input point of the PLC detects a high level, the fact that an electric valve is electrified is shown, and otherwise, the fact that the electric valve is powered off is shown;
in the PLC controller opening instruction detection module, a PLC controller opening instruction signal is output to a terminal of an electric valve actuator through an intermediate relay, a 24VDC power supply is connected to one end of a normally open contact of the intermediate relay, the other end of the normally open contact is connected with an input point of the PLC controller, when the input point of the PLC controller detects a high level, an opening instruction is issued, otherwise, the opening instruction is not issued;
in the PLC closing instruction detection module, a PLC closing instruction signal is output to a terminal of an electric valve actuator through an intermediate relay, a 24VDC power supply is connected to one end of a normally open contact of the intermediate relay, the other end of the normally open contact is connected with an input point of the PLC, when the input point of the PLC detects a high level, a closing instruction is issued, otherwise, the closing instruction is not issued.
The technical scheme provides an automatic fault diagnosis method for an electric valve in an electric system, which specifically comprises the following steps:
A. the PLC controller, the intermediate relay, the alternating current contactor and the electric valve are communicated, and a power supply of the electric valve control system is opened;
B. if the feedback of the intermediate relay is low level, the PLC controller power-on instruction (the intermediate relay and/or the PLC output point) has a fault, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent alternating current contactor fault diagnosis program;
C. if the feedback of the alternating current contactor is low level, the alternating current contactor has a fault, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent fault diagnosis program of the electric valve actuator;
D. if the electric valve is in a non-state, the electric valve actuator has an electrified fault, and the current fault automatic diagnosis program is ended; otherwise, obtaining a diagnosis result of normal power supply of the electric valve, and entering a subsequent PLC (programmable logic controller) opening instruction fault diagnosis program;
E. if the PLC controller is started to send command feedback for issuing, entering a subsequent intermediate relay fault diagnosis program; otherwise, entering a subsequent PLC controller off instruction fault diagnosis program;
F. in the intermediate relay fault diagnosis program in the step E, if the feedback of the intermediate relay is low level, the PLC controller on instruction (the intermediate relay and/or the PLC output point) has a fault, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent electric valve opening fault diagnosis program;
G. if the electric valve is fed back to be at a low level when in place, the electric valve is opened to have a fault, and a subsequent electric valve in-place fault diagnosis program is entered; otherwise, the electric valve is normally opened, and the current fault automatic diagnosis program is ended;
H. if the real-time opening feedback of the electric valve is normal, the current electric valve is normally opened in place, and the current fault automatic diagnosis program is finished; otherwise, the current failure of the electric valve actuator is obtained, and the current automatic failure diagnosis program is finished;
I. in the PLC controller closing instruction fault diagnosis program in the step E, if the PLC controller closing instruction feedback is not issued, entering the fault diagnosis program of the electric valve; otherwise, entering a subsequent intermediate relay fault diagnosis program;
J. in the intermediate relay fault diagnosis program in the step I, if the feedback of the intermediate relay is low level, a PLC controller off instruction (an intermediate relay and/or a PLC output point) has a fault, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent electric valve closing fault diagnosis program;
K. if the electric valve is closed in place and fed back to be low level, the electric valve is closed to have a fault, and a subsequent electric valve closing in place fault diagnosis program is entered; otherwise, the electric valve is normally closed, and the current fault automatic diagnosis program is ended;
H. if the real-time closing degree feedback of the electric valve is normal, the current electric valve is normally closed in place, and the current fault automatic diagnosis program is ended; otherwise, the current electric valve actuator is closed to cause a fault, and the current fault automatic diagnosis program is ended.
Further, the PLC power-on command obstacle comprises an intermediate relay obstacle and/or a PLC output point obstacle.
Further, the electric valve actuator failure comprises electric valve power source obstruction and/or electric circuit obstruction.
Further, the PLC controller on command obstacle comprises an intermediate relay obstacle and/or a PLC output point obstacle.
Further, the electric valve opening failure comprises an electric valve actuator failure.
Further, the electric valve in-place fault comprises an electric valve in-place feedback point fault and/or a power line connection fault.
Further, the electric valve closing failure comprises an electric valve actuator failure.
Further, the electric valve closing position fault comprises an electric valve opening position feedback point fault and/or an electric line connection fault.
In the particle drilling process, a large number of other electrical systems are also used, and the multipoint state feedback monitoring of the whole flow of the electrical system can be carried out according to the design of the automatic fault diagnosis method of the electric valve in the technical scheme, so that the fault identification rate and the maintenance rate of the whole electrical system are improved.
By adopting the technical scheme, the beneficial technical effects brought are as follows:
in the invention, a state monitoring feedback network is established by setting a PLC (programmable logic controller), an intermediate relay, an alternating current contactor and an electric valve and utilizing contacts of the intermediate relay and the alternating current contactor on the basis of the corresponding relation between the monitoring state and the abnormal condition, so that the state real-time feedback monitoring is realized; meanwhile, monitoring information from the electric valve to a PLC (programmable logic controller) path can be enriched, full-point monitoring of each loop is realized, and a foundation is provided for accurate identification of fault points.
The invention utilizes multi-point feedback information and combines a path parameter fusion strategy to carry out one-to-one correspondence on the faults and the feedback phenomena, thereby realizing the automatic identification and display of the fault points, ensuring that the fault points are successfully applied in the particle drilling electric control system, obviously improving the system fault maintenance efficiency, shortening the fault troubleshooting time and providing a feasible technical scheme for the maintainability of similar electric control systems.
Drawings
FIG. 1 is a schematic diagram (I) of the control feedback of an electric valve in the prior art, wherein KA 1-KA 3 is an intermediate relay, and KM1 is an AC contactor;
FIG. 2 is a schematic diagram of the prior art electric valve control feedback;
fig. 3 is a schematic view (one) of the monitoring feedback combination of the automatic fault diagnosis system of the present invention, wherein KA 1-KA 3 is an intermediate relay, and KM1 is an ac contactor;
fig. 4 is a schematic diagram (two) of the monitoring feedback combination of the automatic fault diagnosis system of the present invention, wherein KA1 and KA3 are intermediate relays, and KM1 is an ac contactor;
fig. 5 is a flow chart of the automatic fault diagnosis method of the present invention.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A fault automatic diagnosis method for an electric valve in an electric system specifically comprises the following steps:
A. the PLC controller, the intermediate relay, the alternating current contactor and the electric valve are communicated, and a power supply of the electric valve control system is opened;
B. if the feedback of the intermediate relay is low level, the PLC controller power-on instruction (the intermediate relay and/or the PLC output point) has a fault, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent alternating current contactor fault diagnosis program;
C. if the feedback of the alternating current contactor is low level, the alternating current contactor has a fault, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent fault diagnosis program of the electric valve actuator;
D. if the electric valve is in a non-state, the electric valve actuator has an electrified fault, and the current fault automatic diagnosis program is ended; otherwise, obtaining a diagnosis result of normal power supply of the electric valve, and entering a subsequent PLC (programmable logic controller) opening instruction fault diagnosis program;
E. if the PLC controller is started to send command feedback for issuing, entering a subsequent intermediate relay fault diagnosis program; otherwise, entering a subsequent PLC controller off instruction fault diagnosis program;
F. in the intermediate relay fault diagnosis program in the step E, if the feedback of the intermediate relay is low level, the PLC controller on instruction (the intermediate relay and/or the PLC output point) has a fault, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent electric valve opening fault diagnosis program;
G. if the electric valve is fed back to be at a low level when in place, the electric valve is opened to have a fault, and a subsequent electric valve in-place fault diagnosis program is entered; otherwise, the electric valve is normally opened, and the current fault automatic diagnosis program is ended;
H. if the real-time opening feedback of the electric valve is normal, the current electric valve is normally opened in place, and the current fault automatic diagnosis program is finished; otherwise, the current failure of the electric valve actuator is obtained, and the current automatic failure diagnosis program is finished;
I. in the PLC controller closing instruction fault diagnosis program in the step E, if the PLC controller closing instruction feedback is not issued, entering the fault diagnosis program of the electric valve; otherwise, entering a subsequent intermediate relay fault diagnosis program;
J. in the intermediate relay fault diagnosis program in the step I, if the feedback of the intermediate relay is low level, a PLC controller off instruction (an intermediate relay and/or a PLC output point) has a fault, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent electric valve closing fault diagnosis program;
K. if the electric valve is closed in place and fed back to be low level, the electric valve is closed to have a fault, and a subsequent electric valve closing in place fault diagnosis program is entered; otherwise, the electric valve is normally closed, and the current fault automatic diagnosis program is ended;
H. if the real-time closing degree feedback of the electric valve is normal, the current electric valve is normally closed in place, and the current fault automatic diagnosis program is ended; otherwise, the current electric valve actuator is closed to cause a fault, and the current fault automatic diagnosis program is ended.
In the method for automatically diagnosing the fault of the electric valve in the electric system, the classification of the fault, the feedback phenomenon and the handling measure are shown in the following table 1.
Example 2
Based on embodiment 1, the present embodiment provides an automatic fault diagnosis system for an electrically operated valve in an electrical system, which is arranged in an electrically operated valve control system, where the electrically operated valve control system includes a PLC controller, an intermediate relay, an ac contactor, and an electrically operated valve, an output end of the PLC controller is connected to a contact of the intermediate relay, another contact of the intermediate relay is connected to the ac contactor, the ac contactor is connected to a terminal of the electrically operated valve, and a circuit for real-time control and feedback monitoring of the electrically operated valve is formed among the PLC controller, the intermediate relay, the ac contactor, and the electrically operated valve;
the fault automatic diagnosis system comprises a fault identification module and an operation interface arranged on a PLC (programmable logic controller), wherein the fault identification module is connected with the operation interface and comprises an electric valve real-time opening detection module, an electric valve electrifying detection module, a PLC opening instruction detection module and a PLC closing instruction detection module;
in the real-time opening detection module of the electric valve, valve position feedback current (+)) and valve position feedback current (-)) in a terminal of an electric valve actuator are respectively connected to a PLC controller analog input module, and the electric valve realizes real-time monitoring of the valve position by reading the feedback current in real time;
in the electric valve electrifying detection module, the electric valve is connected with a 380VAC power supply, the PLC controller controls an intermediate relay, and the intermediate relay controls an alternating current contactor, so that the electrification control of the electric valve is realized; the alternating current contactor is additionally provided with a feedback contact, a 24VDC power supply is connected to one end of a normally open contact, the other end of the contact is connected with an input point of a PLC (programmable logic controller), when the input point of the PLC detects a high level, the fact that an electric valve is electrified is shown, and otherwise, the fact that the electric valve is powered off is shown;
in the PLC controller opening instruction detection module, a PLC controller opening instruction signal is output to a terminal of an electric valve actuator through an intermediate relay, a 24VDC power supply is connected to one end of a normally open contact of the intermediate relay, the other end of the normally open contact is connected with an input point of the PLC controller, when the input point of the PLC controller detects a high level, an opening instruction is issued, otherwise, the opening instruction is not issued;
in the PLC closing instruction detection module, a PLC closing instruction signal is output to a terminal of an electric valve actuator through an intermediate relay, a 24VDC power supply is connected to one end of a normally open contact of the intermediate relay, the other end of the normally open contact is connected with an input point of the PLC, when the input point of the PLC detects a high level, a closing instruction is issued, otherwise, the closing instruction is not issued.
In the automatic fault diagnosis system for an electrically operated valve in an electrical system, the fault feedback signals involved are shown in table 2 below.
Claims (10)
1. A method for automatically diagnosing a fault of an electrically operated valve in an electrical system, characterized by:
A. the PLC controller, the intermediate relay, the alternating current contactor and the electric valve are communicated, and a power supply of the electric valve control system is opened;
B. if the feedback of the intermediate relay is low level, the PLC controller power-on instruction fails, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent alternating current contactor fault diagnosis program;
C. if the feedback of the alternating current contactor is low level, the alternating current contactor has a fault, and the current fault automatic diagnosis program is finished; otherwise, entering a subsequent fault diagnosis program of the electric valve actuator;
D. if the electric valve is in a non-state feedback state, the electric valve actuator breaks down, and the current automatic fault diagnosis program is ended; otherwise, obtaining a diagnosis result of normal power supply of the electric valve, and entering a subsequent PLC (programmable logic controller) opening instruction fault diagnosis program;
E. if the PLC controller is started to send command feedback for issuing, entering a subsequent intermediate relay fault diagnosis program; otherwise, entering a subsequent PLC controller off instruction fault diagnosis program;
F. in the intermediate relay fault diagnosis program in the step E, if the feedback of the intermediate relay is low level, the PLC controller is started to instruct to have fault, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent electric valve opening fault diagnosis program;
G. if the electric valve is fed back to be at a low level when in place, the electric valve is opened to have a fault, and a subsequent electric valve in-place fault diagnosis program is entered; otherwise, the electric valve is normally opened, and the current fault automatic diagnosis program is ended;
H. if the real-time opening feedback of the electric valve is normal, the current electric valve is normally opened in place, and the current fault automatic diagnosis program is finished; otherwise, the current failure of the electric valve actuator is obtained, and the current automatic failure diagnosis program is finished;
I. in the PLC controller closing instruction fault diagnosis program in the step E, if the PLC controller closing instruction feedback is not issued, entering the fault diagnosis program of the electric valve; otherwise, entering a subsequent intermediate relay fault diagnosis program;
J. in the intermediate relay fault diagnosis program in the step I, if the feedback of the intermediate relay is low level, the PLC controller close instruction fails, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent electric valve closing fault diagnosis program;
K. if the electric valve is closed in place and fed back to be low level, the electric valve is closed to have a fault, and a subsequent electric valve closing in place fault diagnosis program is entered; otherwise, the electric valve is normally closed, and the current fault automatic diagnosis program is ended;
H. if the real-time closing degree feedback of the electric valve is normal, the current electric valve is normally closed in place, and the current fault automatic diagnosis program is ended; otherwise, the current electric valve actuator is closed to cause a fault, and the current fault automatic diagnosis program is ended.
2. The automatic fault diagnosis method for an electrically operated valve in an electrical system according to claim 1, characterized in that: the PLC controller electrifying instruction obstacle comprises an intermediate relay obstacle and/or a PLC output point obstacle.
3. The automatic fault diagnosis method for an electrically operated valve in an electrical system according to claim 1, characterized in that: the electric valve actuator failure comprises an electric valve power source obstacle and/or an electrified circuit obstacle.
4. The automatic fault diagnosis method for an electrically operated valve in an electrical system according to claim 1, characterized in that: the PLC controller on command obstacle comprises an intermediate relay obstacle and/or a PLC output point obstacle.
5. The automatic fault diagnosis method for an electrically operated valve in an electrical system according to claim 1, characterized in that: the electric valve opening failure comprises an electric valve actuator failure.
6. The automatic fault diagnosis method for an electrically operated valve in an electrical system according to claim 1, characterized in that: the electric valve in-place fault comprises an electric valve in-place feedback point fault and/or an electrified line connection fault.
7. The automatic fault diagnosis method for an electrically operated valve in an electrical system according to claim 1, characterized in that: the electric valve closure failure comprises an electric valve actuator failure.
8. The automatic fault diagnosis method for an electrically operated valve in an electrical system according to claim 1, characterized in that: the electric valve in-position closing fault comprises an electric valve in-position feedback point fault and/or an electric line connection fault.
9. Method for automatic diagnosis of the failure of an electrically operated valve in an electrical system according to any of claims 1-8, characterized in that: the system related to the fault automatic diagnosis method comprises the steps that the system is arranged in an electric valve control system, the electric valve control system comprises a PLC (programmable logic controller), an intermediate relay, an alternating current contactor and an electric valve, the output end of the PLC is connected with the contact of the intermediate relay, the other contact of the intermediate relay is connected with the alternating current contactor, the alternating current contactor is connected with the terminal of the electric valve, and a circuit for real-time control and feedback monitoring of the electric valve is formed among the PLC, the intermediate relay, the alternating current contactor and the electric valve;
the fault automatic diagnosis system comprises a fault identification module and an operation interface arranged on a PLC, wherein the fault identification module is connected with the operation interface and comprises an electric valve real-time opening detection module, an electric valve electrifying detection module, a PLC opening instruction detection module and a PLC closing instruction detection module.
10. The method of automatically diagnosing a failure of an electrically operated valve in an electrical system according to claim 9, wherein: the real-time opening degree detection module of the electric valve comprises: the valve position feedback current (+) and the valve position feedback current (-) in the electric valve actuator terminal are respectively connected with the PLC controller analog quantity input module;
the electric valve electrification detection module comprises: the electric valve is connected with a 380VAC power supply, one end of a contact of the alternating current contactor is connected with a 24VDC power supply, and the other end of the contact is connected with an input point of the PLC;
the PLC controller is provided with an instruction detection module: the PLC opens the command signal and passes the intermediate relay and exports to the electric valve actuator terminal; one end of a normally open contact of the intermediate relay is connected with a 24VDC power supply, and the other end of the normally open contact of the intermediate relay is connected with an input point of a PLC (programmable logic controller);
the PLC controller closes the instruction detection module: the PLC controller closes the command signal and passes the intermediate relay and exports to the actuator terminal of the electric valve; one end of a normally open contact of the intermediate relay is connected with a 24VDC power supply, and the other end of the normally open contact of the intermediate relay is connected with an input point of the PLC.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116293068A (en) * | 2023-05-17 | 2023-06-23 | 中核第七研究设计院有限公司 | Multiple protection valve control method and system |
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| CN116293068A (en) * | 2023-05-17 | 2023-06-23 | 中核第七研究设计院有限公司 | Multiple protection valve control method and system |
| CN116293068B (en) * | 2023-05-17 | 2023-08-11 | 中核第七研究设计院有限公司 | Multiple protection valve control method and system |
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| CN112379664B (en) | 2023-05-26 |
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