CN112379664B - Automatic fault diagnosis method for electric valve in electric system - Google Patents
Automatic fault diagnosis method for electric valve in electric system Download PDFInfo
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- CN112379664B CN112379664B CN202011294517.8A CN202011294517A CN112379664B CN 112379664 B CN112379664 B CN 112379664B CN 202011294517 A CN202011294517 A CN 202011294517A CN 112379664 B CN112379664 B CN 112379664B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention discloses a fault automatic 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 combined configuration of feedback points is optimized, an accurate fault point is quickly given out by combining an automatic identification detection module, and quick troubleshooting of fault reasons is realized, so that the overhauling efficiency is improved, the overhaulability of an electric valve in an electric control system is improved, and the feasibility of automatic diagnosis of the fault 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 the automation control, which makes each drilling equipment and tool get more extensive, better utilization in the production application. Among them, automation of an electrical system is also indispensable in order to ensure that mining work can be smoothly performed.
In an automatic control system of an electrical system, the automatic control system comprises a control loop, an execution loop and a feedback loop, and relates to interaction of strong current and weak current, and 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 needed to be adopted for isolation protection among the loops. Therefore, when the equipment in the electrical system is abnormal, the existing barriers are more likely, and the equipment needs to be manually checked one by one and the real fault point is confirmed. With the development of electrical systems towards intellectualization, unmanned, scale and the like, defects of completely relying on manual inspection of fault points are increasingly prominent, and related problems include: the larger the scale of the electrical system is, the longer the inspection time is, resulting in low inspection efficiency; even if the operation of the electrical system is not affected, the system is required to be stopped for waiting for manual confirmation, so that the operation efficiency of the system is low.
The electric valve in the electric system mainly realizes the functions of cutting off and opening the manifold, introduces two control signals of opening and closing from the function angle, and feeds back two signals of opening and closing in place, thus meeting the use requirement of the system (as shown in figures 1-2). The electric valve can realize the preset function of the electric valve, but has low equipment overhaulability, and is not beneficial to rapidly troubleshooting fault points; in addition, the control signal and the feedback signal related to the electric valve are transmitted through the intermediate relay, the alternating current contactor, the valve terminal, the PLC input and output terminal and the like, and once the signal is abnormal, the real fault point cannot be confirmed in which link, so that the quick removal of operators is not facilitated.
Therefore, in order to meet new requirements of development of an 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.
The publication No. CN207148659U, named "an automatic pump pit leakage prevention control system", was disclosed in 2018, 03, 27, wherein the following is specifically disclosed: the device comprises a PLC controller, a pump pit liquid level detection switch, a pump pit sewage discharge motor, a filter cloth turntable 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 sewage discharge motor and a filter cloth turntable filter device motor; 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 reasonable design, simple and compact structure, convenient operation, high automation degree and high control efficiency. In this patent document, the leakage prevention automatic control of the pump pit is mainly used, and no mention is made of the failure automatic diagnosis.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an automatic fault 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 accurate fault point is quickly given out by combining an automatic identification detection module, and quick investigation of fault reasons is realized, so that the overhaul efficiency is improved, the overhaulability 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 provided:
the technical scheme provides a fault automatic 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 an electric valve terminal, 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 the PLC 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 power-on detection module, a PLC controller on-command detection module and a PLC controller off-command detection module;
in the real-time opening detection module of the electric valve, valve position feedback current (+) -in an actuator terminal of the electric valve is respectively connected to an analog input module of the PLC, and the electric valve realizes real-time monitoring of the valve position by reading the feedback current in real time;
in the electric valve power-on detection module, the electric valve is connected with a 380VAC power supply, a PLC controller controls an intermediate relay, and the intermediate relay controls an alternating-current contactor, so that the power-on control of the electric valve is realized; a feedback contact is additionally arranged on the alternating-current contactor, 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 electric valve is electrified, and otherwise, the electric valve is powered down;
in the PLC controller opening instruction detection module, a PLC controller opening instruction signal is output to an electric valve actuator terminal 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 a PLC controller input point, when the PLC controller input point detects a high level, the opening instruction is issued, and otherwise, the opening instruction is not issued;
in the PLC controller closing instruction detection module, a PLC controller closing instruction signal is output to an electric valve actuator terminal 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 a PLC controller input point, when the PLC controller input point detects a high level, closing instruction issuing is indicated, and otherwise, closing instruction issuing is indicated.
The technical scheme provides a fault automatic diagnosis method for an electric valve in an electric system, which specifically comprises the following steps:
A. the PLC, the intermediate relay, the alternating current contactor and the electric valve are communicated, and a power supply of an electric valve control system is opened;
B. if the feedback of the intermediate relay is low level, the power-on instruction (the intermediate relay and/or the PLC output point) of the PLC fails, and the current automatic fault diagnosis program is ended; otherwise, entering a subsequent alternating current contactor fault diagnosis program;
C. if the feedback of the AC contactor is low level, the AC contactor fails, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent fault diagnosis program of the electric valve actuator;
D. if the feedback of the electric valve is in a stateless state, the electric valve actuator has an electrifying fault, and the current fault automatic diagnosis program is ended; otherwise, a diagnosis result of normal power supply of the electric valve is obtained, and a subsequent PLC controller on instruction fault diagnosis program is entered;
E. if the PLC controller starts instruction feedback to be issued, 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 command (the intermediate relay and/or the PLC output point) fails, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent fault diagnosis program for opening the electric valve;
G. if the in-place feedback of the electric valve is low level, the electric valve is opened to generate faults, and a subsequent in-place fault diagnosis program of the electric valve 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 opened in place normally, and the current fault automatic diagnosis program is ended; otherwise, obtaining that the current electric valve actuator is opened and fails, and ending the current failure automatic diagnosis program;
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 procedure in step I, if the intermediate relay feedback is at a low level, the PLC controller Guan Zhiling (intermediate relay and/or PLC output point) fails, and the current fault automatic diagnosis procedure ends; otherwise, entering a subsequent electric valve closing fault diagnosis program;
K. if the closing feedback of the electric valve is low level, the electric valve is closed to generate faults, and a subsequent electric valve closing 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 closed in place normally, and the current fault automatic diagnosis program is ended; otherwise, the current failure automatic diagnosis program is ended after the failure of the closing of the current electric valve actuator is obtained.
Further, the PLC controller power-on command obstacle includes an intermediate relay obstacle and/or a PLC output point obstacle.
Further, the electric valve actuator failure includes an electric valve power failure and/or an energized line failure.
Further, the PLC controller command opening obstacle comprises an intermediate relay obstacle and/or a PLC output point obstacle.
Further, the electric valve opening failure includes an electric valve actuator failure.
Further, the electric valve open-in-place fault comprises an electric valve open-in-place feedback point fault and/or an electrified line connection fault.
Further, the electric valve closing failure includes an electric valve actuator failure.
Further, the electric valve closing fault comprises an electric valve opening feedback point fault and/or an electrified line connection fault.
In the particle drilling process, a large number of other electrical systems are also used, so that the fault automatic diagnosis method of the electric valve in the technical scheme can be used for carrying out multi-point state feedback monitoring on the whole flow of the electrical system, and 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:
according to the invention, a state monitoring feedback network is established based on the corresponding relation between the monitoring state and the abnormal condition by arranging the PLC, the intermediate relay, the alternating current contactor and the electric valve and utilizing the contacts of the intermediate relay and the alternating current contactor, so that the state real-time feedback monitoring is realized; meanwhile, monitoring information on the paths from the electric valve to the PLC can be enriched, full-point monitoring of each loop is achieved, and a basis is provided for accurate fault point identification.
The invention utilizes the feedback information of multiple points and combines the strategy of path parameter fusion to carry out one-to-one correspondence on faults and feedback phenomena, thereby realizing the automatic identification and display of the fault points, leading the fault points to be successfully applied in the particle drilling electric control system, obviously improving the system fault maintenance efficiency, shortening the fault maintenance time and providing a feasible technical scheme for the maintainability of the similar electric control system.
Drawings
FIG. 1 is a schematic diagram of a prior art control feedback of an electric valve, wherein KA 1-KA 3 are intermediate relays, and KM1 is an AC contactor;
FIG. 2 is a schematic diagram of a prior art control feedback of an electrically operated valve (II);
FIG. 3 is a schematic diagram (I) of a monitoring feedback combination of the automatic fault diagnosis system, wherein KA 1-KA 3 are intermediate relays, and KM1 is an AC contactor;
fig. 4 is a schematic diagram (two) of a monitoring feedback combination of the automatic fault diagnosis system, wherein KA1 and KA3 are intermediate relays, KM1 is an ac contactor;
fig. 5 is a flowchart of a fault automatic diagnosis method in the present invention.
Detailed Description
In the following, it is obvious that the embodiments described are only some embodiments of the present invention, but not all embodiments, by clearly and completely describing the technical solutions in the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
An automatic fault diagnosis method for an electric valve in an electric system specifically comprises the following steps:
A. the PLC, the intermediate relay, the alternating current contactor and the electric valve are communicated, and a power supply of an electric valve control system is opened;
B. if the feedback of the intermediate relay is low level, the power-on instruction (the intermediate relay and/or the PLC output point) of the PLC fails, and the current automatic fault diagnosis program is ended; otherwise, entering a subsequent alternating current contactor fault diagnosis program;
C. if the feedback of the AC contactor is low level, the AC contactor fails, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent fault diagnosis program of the electric valve actuator;
D. if the feedback of the electric valve is in a stateless state, the electric valve actuator has an electrifying fault, and the current fault automatic diagnosis program is ended; otherwise, a diagnosis result of normal power supply of the electric valve is obtained, and a subsequent PLC controller on instruction fault diagnosis program is entered;
E. if the PLC controller starts instruction feedback to be issued, 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 command (the intermediate relay and/or the PLC output point) fails, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent fault diagnosis program for opening the electric valve;
G. if the in-place feedback of the electric valve is low level, the electric valve is opened to generate faults, and a subsequent in-place fault diagnosis program of the electric valve 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 opened in place normally, and the current fault automatic diagnosis program is ended; otherwise, obtaining that the current electric valve actuator is opened and fails, and ending the current failure automatic diagnosis program;
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 procedure in step I, if the intermediate relay feedback is at a low level, the PLC controller Guan Zhiling (intermediate relay and/or PLC output point) fails, and the current fault automatic diagnosis procedure ends; otherwise, entering a subsequent electric valve closing fault diagnosis program;
K. if the closing feedback of the electric valve is low level, the electric valve is closed to generate faults, and a subsequent electric valve closing 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 closed in place normally, and the current fault automatic diagnosis program is ended; otherwise, the current failure automatic diagnosis program is ended after the failure of the closing of the current electric valve actuator is obtained.
In the method for automatically diagnosing the failure of the electric valve in the electric system, the fault classification, feedback phenomenon, and disposal measures are shown in table 1 below.
Example 2
Based on embodiment 1, the embodiment provides a fault automatic 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 controller, an intermediate relay, an alternating current contactor and an electric valve, the output end of the PLC controller is connected with a contact point of the intermediate relay, the other contact point 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 controller, 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 the PLC 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 power-on detection module, a PLC controller on-command detection module and a PLC controller off-command detection module;
in the real-time opening detection module of the electric valve, valve position feedback current (+) -in an actuator terminal of the electric valve is respectively connected to an analog input module of the PLC, and the electric valve realizes real-time monitoring of the valve position by reading the feedback current in real time;
in the electric valve power-on detection module, the electric valve is connected with a 380VAC power supply, a PLC controller controls an intermediate relay, and the intermediate relay controls an alternating-current contactor, so that the power-on control of the electric valve is realized; a feedback contact is additionally arranged on the alternating-current contactor, 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 electric valve is electrified, and otherwise, the electric valve is powered down;
in the PLC controller opening instruction detection module, a PLC controller opening instruction signal is output to an electric valve actuator terminal 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 a PLC controller input point, when the PLC controller input point detects a high level, the opening instruction is issued, and otherwise, the opening instruction is not issued;
in the PLC controller closing instruction detection module, a PLC controller closing instruction signal is output to an electric valve actuator terminal 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 a PLC controller input point, when the PLC controller input point detects a high level, closing instruction issuing is indicated, and otherwise, closing instruction issuing is indicated.
In an automatic fault diagnosis system of an electric valve in an electric system, fault feedback signals involved are shown in the following table 2.
Claims (8)
1. An automatic fault diagnosis method for an electric valve in an electric system is characterized in that:
A. the PLC, the intermediate relay, the alternating current contactor and the electric valve are communicated, and a power supply of an electric valve control system is opened;
B. if the feedback of the intermediate relay is low level, the power-on instruction of the PLC fails, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent alternating current contactor fault diagnosis program;
C. if the feedback of the AC contactor is low level, the AC contactor fails, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent fault diagnosis program of the electric valve actuator;
D. if the feedback of the electric valve is in a non-state, the electric valve actuator fails, and the current automatic fault diagnosis program is ended; otherwise, a diagnosis result of normal power supply of the electric valve is obtained, and a subsequent PLC controller on instruction fault diagnosis program is entered;
E. if the PLC controller starts instruction feedback to be issued, entering a subsequent intermediate relay fault diagnosis program; otherwise, entering a subsequent PLC controller off instruction fault diagnosis program;
F. in the fault diagnosis program of the intermediate relay in the step E, if the feedback of the intermediate relay is low level, the PLC controller starts an instruction to generate a fault, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent fault diagnosis program for opening the electric valve;
G. if the in-place feedback of the electric valve is low level, the electric valve is opened to generate faults, and a subsequent in-place fault diagnosis program of the electric valve 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 opened in place normally, and the current fault automatic diagnosis program is ended; otherwise, obtaining that the current electric valve actuator is opened and fails, and ending the current failure automatic diagnosis program;
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 fault diagnosis program of the intermediate relay in the step I, if the feedback of the intermediate relay is low level, the PLC controller off instruction fails, and the current fault automatic diagnosis program is ended; otherwise, entering a subsequent electric valve closing fault diagnosis program;
K. if the closing feedback of the electric valve is low level, the electric valve is closed to generate faults, and a subsequent electric valve closing 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 closed in place normally, and the current fault automatic diagnosis program is ended; otherwise, obtaining that the closing of the current electric valve actuator fails, and ending the current failure automatic diagnosis program;
the system related to the fault automatic diagnosis method comprises 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 an electric valve terminal, 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 system comprises a fault identification module and an operation interface arranged on the 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 power-on detection module, a PLC on instruction detection module and a PLC off instruction detection module;
the real-time opening detection module of the electric valve comprises: valve position feedback current (+) -in the electric valve actuator terminal is respectively connected with the PLC controller analog input module;
the electric valve energization detection module is characterized in that: the electric valve is connected with 380VAC power supply, and the PLC controller controls the intermediate relay to control the intermediate
The relay controls the alternating-current contactor to realize the power-on control of the electric valve; a feedback contact is additionally arranged on the alternating-current contactor, 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 electric valve is electrified, and otherwise, the electric valve is powered down;
the PLC controller opening instruction detection module: the method comprises the steps that a PLC controller opening instruction signal is output to an electric valve actuator terminal 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 a PLC controller input point, when the PLC controller input point detects a high level, the opening instruction is issued, and otherwise, the opening instruction is not issued;
the PLC controller closing instruction detection module comprises: the PLC controller off instruction signal is output to the electric valve through the intermediate relay
And the end of the actuator terminal is connected with one end of a normally open contact of the intermediate relay through a 24VDC power supply, the other end of the intermediate relay is connected with an input point of the PLC, when the input point of the PLC detects a high level, the output of the closing instruction is indicated, and otherwise, the output of the closing instruction is indicated.
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 power-on 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 malfunction includes an electric valve power failure and/or an energized line failure.
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 command opening 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 includes 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 closing failure includes 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 motor valve closing fault comprises a motor valve opening feedback point fault and/or an energizing line connection fault.
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| CN1624370A (en) * | 2004-12-20 | 2005-06-08 | 华中科技大学 | Radio controller for oil gas pipeline control valve |
| CN101441475B (en) * | 2008-12-22 | 2011-06-08 | 三一重工股份有限公司 | Failure diagnosis device and method of electric control circuit |
| CN102777660A (en) * | 2012-07-31 | 2012-11-14 | 宝钢不锈钢有限公司 | Opening control device of electrically operated valve |
| EP2993537A1 (en) * | 2014-09-08 | 2016-03-09 | Siemens Aktiengesellschaft | Diagnosis of faults in automation systems |
| CN205981673U (en) * | 2016-08-31 | 2017-02-22 | 河北钢铁股份有限公司承德分公司 | Push -pull valve fault diagnostic |
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