Assessment method for troubleshooting of electrical control circuit

Abstract

The invention discloses an assessment method for troubleshooting of an electrical control circuit, and the method comprises the steps: S1, enabling an assessment device to have a typical fault setting function of the electrical control circuit, and enabling a fault phenomenon and a signal of a circuit measurement point to be completely consistent with an actual circuit, so as to achieve the fault detection of a tested person; s2, the control computer transmits an initial fault setting instruction to the PLC according to a preset fault, and the PLC automatically realizes setting of a wire connection fault, a device fault and a setting value fault of the assessment device according to the instruction; s3, the computer is controlled to complete login of the tested person, and after the tested person selects and confirms the detected fault on the computer, the fault is automatically recovered after the PLC judges the correctness of the selected fault; according to the invention, operation and practical training examination can be carried out on specific electrical control line faults, and the working condition of an actual line is simulated, so that convenient guidance is provided for troubleshooting and judgment of the electrical control line faults.

Description

Technical Field

[0001] The invention belongs to the technical field of training and assessment devices, and in particular relates to an assessment method for troubleshooting electrical control circuits. Background Art

[0002] Electrician troubleshooting requires electricians to be proficient in relevant professional knowledge, familiar with the working principles of electrical equipment, master the working mode of the equipment, and troubleshoot equipment faults based on actual electrical control characteristics. During maintenance operations, maintenance electricians can only deepen their understanding of faulty equipment, correctly carry out fault testing, and quickly test the fault location by quickly comparing the electrical circuit diagram with the actual parts distribution diagram to grasp the actual distribution location of the parts in the electrical equipment.

[0003] In current teaching, electricians are trained according to simple circuit principles and process flows. It is impossible to conduct practical training assessments on specific circuit diagrams, simulate the working conditions of real equipment, and truly reflect the assessment process of first checking the fault site, then analyzing the cause, and then troubleshooting the equipment. Summary of the invention

[0004] The present invention provides an assessment method for troubleshooting of electrical control circuits to solve the problem that electricians are trained according to simple circuit principles and process flows in current teaching, and that practical training assessments on specific circuit diagrams cannot be conducted, the working conditions of real equipment cannot be simulated, and the assessment process of first checking the fault site, then analyzing the cause, and then troubleshooting the equipment cannot be truly reflected.

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] The embodiment of the present invention provides an assessment method for troubleshooting an electrical control circuit. The assessment method is implemented by an assessment device, which includes a fault setting device, a circuit under test, and a control computer. The assessment method includes:

[0007] Step S1, the assessment device includes a relay, a PLC controller and a conversion contactor. The assessment device has a typical fault function of setting the electrical control circuit, and makes the fault phenomenon and the signal of the circuit measurement point completely consistent with the actual circuit, so as to be used for fault detection of the person being tested;

[0008] Step S2, the control computer transmits an initial fault setting instruction to the PLC controller according to the preset fault, and the PLC controller automatically implements the wire connection fault, device fault and setting value fault setting of the assessment device according to the instruction, and the device fault and setting value fault of the assessment device are preset;

[0009] Step S3, the control computer completes the login of the examinee, and the examinee selects confirmation on the computer for the fault detected. After the PLC controller determines the correctness of the selected fault, the fault is automatically restored.

[0010] According to an optional embodiment of the present invention, the wire connection fault in step S2 includes open circuit, short circuit and ground fault; open circuit: realized by setting a normally closed contact for a series fault in the line, short circuit: realized by setting a normally open contact connection between a certain point and a power supply, ground fault: realized by setting a normally open contact and a resistor connection for a fault between a certain point and the ground;

[0011] The device failure in step S2 includes coil failure, normally open contact failure, normally closed contact failure, stop button failure, thermal relay failure and fuse failure;

[0012] Coil fault: In case of coil parallel fault, normally open contacts are set to realize short circuit fault;

[0013] Normally open contact failure: remove the internal contacts of the relay and contactor, retain the wiring terminals, and then connect the normally open contacts in parallel to solve the problem;

[0014] Normally closed contact does not open fault: remove the internal contacts of the original relay / contactor, retain the wiring terminals, and then connect the normally closed contacts in parallel to achieve the fault;

[0015] Stop button failure: If the button's normally closed contact fails in parallel, set the normally closed contact;

[0016] Thermal relay failure: remove the internal contacts of the relay and contactor, retain the wiring terminals, and set the normally closed contacts in parallel for failure of the normally closed contacts;

[0017] Fuse failure: When a short circuit fault is set, the fuse should be able to blow; no independent fuse failure is set. It is necessary to monitor whether the fuse is replaced, that is, collect whether the two ends of the fuse are connected to the PLC controller for judgment.

[0018] According to an optional embodiment of the present invention, the short circuit and open circuit fault settings of the control circuit in step S2 are realized by controlling the PLC contacts output by the relay to be turned on or off, and the fault of the main circuit of the assessment device is realized by controlling the switching contactor to be turned on or off by the PLC.

[0019] According to an optional embodiment of the present invention, the component and circuit numbers of all the tested circuits in step S1 are the same as the component and circuit numbers of the actual electrical circuits; the connecting wires and cables of the electrical components of all the tested circuits pass through the bottom plate of the fixed components and are routed on the back side of the bottom plate.

[0020] According to an optional embodiment of the present invention, step S3 includes: during detection, judging whether each terminal is on the same line by the line number and wiring diagram marked on the wire, and if not, recording the input fault information.

[0021] According to an optional embodiment of the present invention, step S3 includes: in electrical control circuit fault detection, insulation measurement is used, circuit isolation is adopted to prevent damage to weak equipment during insulation measurement; live measurement is adopted, and electric shock protection is designed at the power input end.

[0022] According to an optional embodiment of the present invention, step S3 includes: the control computer sends single fault recovery, fault troubleshooting result statistics and scoring instructions to the PLC controller.

[0023] Beneficial effect: The embodiment of the present invention provides an assessment method for troubleshooting an electrical control circuit, comprising: step S1, the assessment device comprises a relay, a PLC controller and a conversion contactor, the assessment device has a typical fault function of setting the electrical control circuit, and makes the fault phenomenon and the signal of the circuit measurement point completely consistent with the actual circuit, so as to be used for fault detection of the examinee; step S2, the control computer transmits an initial fault setting instruction to the PLC controller according to the preset fault, and the PLC controller automatically implements the wire connection fault, device fault and setting value fault setting of the assessment device according to the instruction, and the device fault and setting value fault of the assessment device are pre-set; step S3, the control computer completes the login of the examinee, and the examinee selects and confirms the fault found in the detection on the computer, and the fault is automatically restored after the PLC controller judges the correctness of the selected fault. The present invention can perform operation and practical training assessment on specific electrical control circuit faults, simulate the working conditions of the actual circuit, and thus provide convenient guidance for troubleshooting and judgment of electrical control circuit faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A flow chart of an assessment method for troubleshooting electrical control circuits provided in an embodiment of the present application.

[0026] Figure 2 A schematic diagram of the functional modules of an assessment device provided in an embodiment of the present application.

[0027] Figure 3 A front view of an assessment device provided in an embodiment of the present application.

[0028] Figure 4 This is a rear view of an assessment device provided in an embodiment of the present application.

[0029] Figure 5 A side view of an assessment device provided in an embodiment of the present application.

[0030] Figure 6 , Figure 7 and Figure 8 A schematic diagram of a device failure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0032] The embodiment of the present invention provides an assessment method for troubleshooting an electrical control circuit. The assessment method is implemented by an assessment device, which includes a fault setting device, a circuit to be tested, and a control computer; wherein, Figure 1 As shown, the assessment method includes:

[0033] Step S1, the assessment device includes a relay, a PLC controller and a conversion contactor. The assessment device has a typical fault function of setting the electrical control circuit, and makes the fault phenomenon and the signal of the circuit measurement point completely consistent with the actual circuit, so as to be used for fault detection of the person being tested;

[0034] Step S2, the control computer transmits an initial fault setting instruction to the PLC controller according to the preset fault, and the PLC controller automatically implements the wire connection fault, device fault and setting value fault setting of the assessment device according to the instruction, and the device fault and setting value fault of the assessment device are preset;

[0035] Step S3, the control computer completes the login of the examinee, and the examinee selects confirmation on the computer for the fault detected. After the PLC controller determines the correctness of the selected fault, the fault is automatically restored.

[0036] like Figure 2 As shown, the test device in step S1 includes a relay, a PLC controller and a conversion contactor. Figure 3 As shown, the front view of the test device is equipped with a tool cabinet, a component cabinet, a starter box power switch, an input power voltage meter, a Y starter box logo, a direct starter box logo and a power indicator light. Figure 4As shown in the figure, the rear view of the test device is equipped with a main input power switch and a computer communication cable connector. Figure 5 As shown, the side view of the test device is equipped with a motor and a motor starter box. The power supply of the test device is three-phase 380V, and a motor with smaller power, volume and weight should be selected as much as possible. The electrical control circuit can consider 24VAC or 36VAC.

[0037] The component and line numbers of all the tested circuits in step S1 are the same as those of the actual electrical circuits; the connecting wires and cables of the electrical components of all the tested circuits pass through the bottom plate of the fixed components and are routed on the back of the bottom plate.

[0038] Typical faults in step S1 include wire connection faults and device faults;

[0039] The wire connection faults include open circuit, short circuit and grounding fault; open circuit: achieved by setting a normally closed contact for a series fault in the line; short circuit: achieved by setting a normally open contact connection between a certain point and the power supply through a fault; grounding fault: achieved by setting a normally open contact and a resistor connection between a certain point and the ground.

[0040] like Figure 6 , Figure 7 and Figure 8 As shown, the device failures include coil failure, normally open contact failure, normally closed contact failure, stop button failure, thermal relay failure and fuse failure.

[0041] Coil fault: In case of coil parallel fault, normally open contact is set to realize short circuit fault, and ground fault can be set.

[0042] Normally open contact does not close fault: remove the internal contacts of the relay and contactor, retain the wiring terminals, and then set the normally open contacts in parallel to solve the fault.

[0043] Normally closed contact does not open fault: remove the internal contacts of the original relay / contactor, retain the wiring terminals, and then set the normally closed contacts in parallel to achieve the fault.

[0044] Stop button failure: The button's normally closed contact fails in parallel and sets the normally closed contact.

[0045] Thermal relay failure: remove the internal contacts of the relay and contactor, retain the wiring terminals, and set the normally closed contacts in parallel for failure of the normally closed contacts.

[0046] Fuse failure: When a short circuit fault is set, the fuse should be able to blow; no independent fuse failure is set. It is necessary to monitor whether the fuse is replaced, that is, collect whether the two ends of the fuse are connected to the PLC controller for judgment.

[0047] The short circuit and open circuit fault settings of the control circuit in step S2 are realized by controlling the PLC contacts output by the relay to be turned on or off, and the main circuit fault of the assessment device is realized by controlling the PLC to turn on or off the switching contactor. The PLC controller performs the initial setting of the fault and the fault recovery after the correct fault judgment according to the control instructions of the control computer.

[0048] Step S3 includes: during detection, judging whether each terminal is on the same line by the line number and wiring diagram marked on the wire, and if not, recording the input fault information.

[0049] Step S3 includes: in the electrical control circuit fault detection, using insulation measurement and circuit isolation to prevent damage to weak equipment during insulation measurement; and performing live measurement and designing electric shock protection at the power input end.

[0050] Step S3 includes: the control computer sends a single fault recovery, fault troubleshooting result statistics and scoring instruction to the PLC controller.

[0051] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention shall be based on the attached claims and the scope defined therein.

Claims

1. An assessment method for troubleshooting electrical control circuits, the assessment method being implemented by an assessment device, the assessment device comprising a fault setting device, a circuit under test and a control computer; characterized in that: The assessment methods include: Step S1, the assessment device includes a relay, a PLC controller and a conversion contactor. The assessment device has a typical fault function of setting the electrical control circuit, and makes the fault phenomenon and the signal of the circuit measurement point completely consistent with the actual circuit, so as to be used for fault detection of the person being tested; Step S2, the control computer transmits an initial fault setting instruction to the PLC controller according to the preset fault, and the PLC controller automatically implements the wire connection fault, device fault and setting value fault setting of the assessment device according to the instruction, and the device fault and setting value fault of the assessment device are preset; Step S3, the control computer completes the login of the examinee, and the examinee selects confirmation on the computer for the fault detected. After the PLC controller determines the correctness of the selected fault, the fault is automatically restored.

2. The electrical control circuit fault detection and assessment method according to claim 1 is characterized in that: The wire connection fault in step S2 includes open circuit, short circuit and ground fault; open circuit: realized by setting a normally closed contact for series fault in the line; short circuit: realized by setting a normally open contact for fault connection between a certain point and the power supply; ground fault: realized by setting a normally open contact and a resistor for fault connection between a certain point and the ground; The device failure in step S2 includes coil failure, normally open contact failure, normally closed contact failure, stop button failure, thermal relay failure and fuse failure; Coil fault: In case of coil parallel fault, normally open contacts are set to realize short circuit fault; Normally open contact failure: remove the internal contacts of the relay and contactor, retain the wiring terminals, and then connect the normally open contacts in parallel to solve the problem; Normally closed contact does not open fault: remove the original relay and contactor internal contacts, retain the wiring terminals, and then parallel the fault setting normally closed contacts to achieve; Stop button failure: If the button's normally closed contact fails in parallel, set the normally closed contact; Thermal relay failure: remove the internal contacts of the relay and contactor, retain the wiring terminals, and set the normally closed contacts in parallel for failure of the normally closed contacts; Fuse failure: When a short circuit fault is set, the fuse should be able to blow; no independent fuse failure is set. It is necessary to monitor whether the fuse is replaced, that is, collect whether the two ends of the fuse are connected to the PLC controller for judgment.

3. The electrical control circuit fault detection and assessment method according to claim 2 is characterized in that: The short circuit and open circuit fault settings of the control circuit in step S2 are realized by controlling the PLC contacts of the relay output to be turned on or off, and the fault of the main circuit of the assessment device is realized by controlling the PLC to control the switching contactor to be turned on or off.

4. The electrical control circuit fault detection and assessment method according to claim 1 is characterized in that: The component and line numbers of all the tested circuits in step S1 are the same as those of the actual electrical circuits; the connecting wires and cables of the electrical components of all the tested circuits pass through the bottom plate of the fixed components and are routed on the back of the bottom plate.

5. The electrical control circuit fault detection and assessment method according to claim 1 is characterized in that: Step S3 includes: during detection, judging whether each terminal is on the same line by the line number and wiring diagram marked on the wire, and if not, recording the input fault information.

6. The electrical control circuit fault detection and assessment method according to claim 5 is characterized in that: Step S3 includes: in the electrical control circuit fault detection, using insulation measurement and circuit isolation to prevent damage to weak equipment during insulation measurement; and performing live measurement and designing electric shock protection at the power input end.

7. The electrical control circuit fault detection and assessment method according to claim 6 is characterized in that: Step S3 includes: the control computer sends a single fault recovery, fault troubleshooting result statistics and scoring instruction to the PLC controller.

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