A method for troubleshooting the failure of the oil temperature output of the fuel consumption meter to be uncontrolled

Abstract

The present application provides a method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled, and belongs to the field of fault detection technology. The method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled specifically includes the following steps: S100: cooling water pump unit fault detection; S200: heating tank control unit fault detection; S300: electric proportional control valve unit fault detection; A method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled, the method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled can correctly and quickly determine the cause of the fuel consumption meter oil temperature failure that cannot be controlled by systematically setting cooling water pump unit fault detection steps, heating tank control unit fault detection steps, and electric proportional control valve unit fault detection steps, effectively improving the current troubleshooting methods on the market, reducing waste of troubleshooting resources, and having a short troubleshooting cycle, reducing the impact on equipment use.

Description

Technical Field

[0001] The present application relates to the field of fault detection, and in particular to a method for troubleshooting a fuel consumption meter failure in which the oil temperature output cannot be controlled. Background Art

[0002] The inventor has found through research that the large-range fuel consumption meter equipment of the new product line often fails to control the oil temperature, but there are many causes of failure associated with this situation. For example, abnormalities in the cooling water pump unit, the heating tank control unit, the electric proportional control valve unit, etc. are all causes of the failure. How to analyze and troubleshoot the fault points one by one is a skill that equipment maintenance workers must master. At present, there is no systematic troubleshooting method for the fuel consumption meter oil temperature failure that cannot be controlled on the market, resulting in a huge waste of troubleshooting resources and a long troubleshooting cycle, which seriously affects the use of equipment.

[0003] How to invent a method for troubleshooting the failure of the oil temperature output of a fuel consumption meter to improve these problems has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0004] In order to remedy the above shortcomings, the present application provides a method for troubleshooting the failure of a fuel consumption meter to control the oil temperature, aiming to improve the problem that the existing troubleshooting methods easily cause waste of troubleshooting resources and have a long troubleshooting cycle.

[0005] The present application provides a method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled, which specifically includes the following steps:

[0006] S100: Cooling water pump unit fault detection;

[0007] S101: After the system is started, check whether the PLC output point Q0.2 has output. If there is no output at the PLC output point Q0.2, the condition is not met, and it is necessary to check whether there is input at the input point I0.5 of the water flow switch;

[0008] S102: In the power-off state, use the resistance range of the multimeter to measure whether the water flow switch is on, and the resistance value is 0 ohms. When the water flow switch is not on, the operator checks the cooling water Y-type filter element to determine whether the Y-type filter element is blocked;

[0009] S103: Q0.2 has output and the cooling water pump motor does not rotate, then the fault is that the intermediate relay KA2, KM2 overload relay FR1, motor coil, etc. are abnormal;

[0010] S104: Use the DC voltage range of a multimeter to measure the voltage between Q0.2 and DC0 of the KA2 base. There should be a DC24V voltage. If there is no output, it means the relay contact is faulty.

[0011] S105: Use the AC voltage range of the multimeter to measure whether the voltage value of the coil A1 and A2 of the KM2 contactor is AC220V. If there is no measured voltage, check the thermal overload relay FR1;

[0012] S106: Then use the red pen of the multimeter to touch the 3# of the coil A1 of the KM2 contactor, and use the black pen to measure the 95 and 96 terminals of the thermal overload relay FR1 once each, to determine whether the thermal relay FR1 is operating protection or failure;

[0013] S107: After the air switch is powered off, use the resistance range of a multimeter to measure the resistance between the three phases of the motor coil. The resistance should be balanced at 15.0 ohms and not grounded.

[0014] S200: Heating tank control unit fault detection;

[0015] S201: The heating condition of the heating tank must be that the KM2 of the cooling water pump is energized, and its auxiliary normally open contact is closed. The signal is input to the PLC's I0.2 and the heater temperature protector I1.1. If there is no input to I1.1, it is judged that the heater temperature protector detects that the heater temperature is over-temperature and disconnects. At this time, unplug the wire plugs on the 1 and C pins after power off, and use the resistance range of the multimeter to measure the two pin contacts to see if the resistance is 0 ohms;

[0016] S202: When the above conditions are normal, Q0.1 has output → KA1 is energized → KM1 contactor is controlled to be energized → 380V three-phase AC power is supplied to the SSCR controller as power supply, and Q0.0 has DC24V output power supply; use the DC voltage range of the multimeter to put the red pen on Q0.0 of the terminal block and the black pen on the two pins of the thermostat to measure once. If one of the pins has a DC24V voltage and the other has no voltage, it can be confirmed that the thermostat protects the disconnection of the DC24V control signal source of the SSCR, thereby protecting the SSCR from damage, and further inspection of the cooling fan is required;

[0017] S203: Then observe whether the cooling fan on the SSCR controller is rotating. If it is not rotating, use the multimeter AC voltage range to measure the voltage between U5 and N of the terminal block. If the measured voltage is AC220V, the cooling fan is damaged.

[0018] S204: When the SSCR controller normally supplies power to the tank heater, if the heating is not working, the heater needs to be checked. After power off, use the resistance range of the multimeter to measure and check whether the three-phase resistance of the heater U, V, and W terminals is balanced at 16.2 ohms. Further, remove the heater wire box cover and use a 500V megohmmeter to measure whether the resistance to ground is above 0.5 megohms. If the measured resistance value is abnormal, it is determined that the heater is faulty.

[0019] S300: Electric proportional control valve unit fault detection;

[0020] S301: In the running state, use the DC voltage range of the multimeter to check whether the voltage of the G+ and G0- terminals of the working power supply of the electric proportional valve controller is DC24V; check whether the positions of the 1, 2, 3, and 4 DIP switches in the controller are correct, 1 and 4 are set to OFF, 2 and 3 are set to ON, which is the analog current signal control mode, and is matched with the control signal source of the equipment;

[0021] S302: Then switch the multimeter to the AC / DC mA range, insert the black pen into the 10A hole, keep the red pen unchanged, keep the Y, YM on the controller, and the QW62+ line at the top of the terminal block unchanged, remove the QW62+ line at the bottom of the terminal block and place it aside, touch the QW62+ line on the terminal block with a red pen, and touch the removed QW62+ line with a black pen to let current flow through the multimeter to measure the current signal, the current value should be between 4-20mA, and check that the working light in the controller is normally green;

[0022] S303: During the control process, check whether the action of the valve core push rod is correct, and observe whether the valve core is stuck.

[0023] In a specific implementation manner, in step S102, after closing the water inlet valve, use a wrench to remove the Y-type filter, take out the filter element and clean up scale and garbage to ensure smooth water flow.

[0024] In a specific implementation scheme, in step S104, the multimeter needs to be switched to the AC voltage range to measure the 3# line and the N line of the contact. There should be an output AC220V voltage. If there is no output, it means that the relay contact is faulty.

[0025] In a specific implementation scheme, in step S106, when AC220V is measured between terminal 95 and no AC220V voltage is measured between terminal 96, it is determined that the thermal relay FR1 is in protection or has failed. At this time, the air switch is powered off and the multimeter is switched to the resistance range for further measurement and inspection of the contacts of terminal 95-96 of the thermal overload relay. The normal value should be 0 ohms.

[0026] In a specific implementation scheme, in step S202, normally the IN green light on the SSCR controller is on and the OUT red light is on. If the Q0.2 of the PLC has an output, but the IN and OUT working operation lights on the SSCR controller are not on, it is necessary to check whether the temperature controller installed on the SSR radiator is activated for protection because it detects that the temperature of the SSCR radiator is higher than 80 degrees.

[0027] In a specific implementation scheme, in step S303, when the valve core push rod does not move, the magnetic coil is further disassembled and the resistance of the magnetic coil is checked with a multimeter resistance range to check whether it is 9.1 ohms and not grounded.

[0028] Beneficial effect: The present application provides a method for troubleshooting the failure of a fuel consumption meter to control the oil temperature. The method for troubleshooting the failure of a fuel consumption meter to control the oil temperature can correctly and quickly determine the cause of the failure to control the oil temperature of the fuel consumption meter through the systematic setting of a cooling water pump unit fault detection step, a heating tank control unit fault detection step and an electric proportional control valve unit fault detection step, thereby effectively improving the current troubleshooting methods on the market, reducing the waste of troubleshooting resources, and shortening the troubleshooting cycle, thereby reducing the impact on equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a flow chart of a method for troubleshooting a fuel consumption meter failure in which the oil temperature cannot be controlled in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0032] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] See also Figure 1 The present application provides a method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled, which specifically includes the following steps:

[0034] S100: Cooling water pump unit fault detection;

[0035] S101: After the system is started, check whether the PLC output point Q0.2 (water pump control intermediate relay KA2 coil) has output. If there is no output at the PLC output point Q0.2, the condition is not met, and it is necessary to check whether there is input at the input point I0.5 of the water flow switch;

[0036] S102: In the power-off state, use the resistance range of the multimeter to measure whether the water flow switch is on, and the resistance value is 0 ohms. When the water flow switch is not on, the operator checks the cooling water Y-type filter element to determine whether the Y-type filter element is blocked;

[0037] After closing the water inlet valve, use a wrench to remove the Y-type filter, take out the filter element and clean out the scale and garbage to ensure smooth water flow;

[0038] S103: Q0.2 has output and the cooling water pump motor does not rotate. The fault is that the intermediate relay KA2, KM2 overload relay FR1, motor coil, etc. are abnormal;

[0039] S104: Use the DC voltage range of the multimeter to measure the voltage between Q0.2 and DC0 of the KA2 base. There should be a DC24V voltage. At this time, switch the multimeter to the AC voltage range to measure the 3# line and N line of the contact. There should be an output AC220V voltage. If there is no output, it means the relay contact is faulty.

[0040] S105: Use the AC voltage range of the multimeter to measure whether the voltage value of the coil A1 and A2 of the KM2 contactor is AC220V. If there is no measured voltage, check the thermal overload relay FR1;

[0041] S106: Then use the red pen of the multimeter to touch the coil A1 terminal 3# of the KM2 contactor, and use the black pen to measure the 95 and 96 terminals of the thermal overload relay FR1 once. When there is AC220V between the 95 terminal and there is no AC220V voltage between the 96 terminal, it is determined that the thermal relay FR1 is in protection or failed. At this time, turn off the air switch and switch the multimeter to the resistance mode to further measure and check the contacts of the 95-96 terminals of the thermal overload relay. The normal value should be 0 ohms.

[0042] S107: After the air switch is powered off, use the resistance range of a multimeter to measure the resistance between the three phases of the motor coil. The resistance should be balanced at 15.0 ohms and not grounded.

[0043] S200: Heating tank control unit fault detection;

[0044] S201: The heating tank must work under the heating condition that the cooling water pump's KM2 is energized, and its auxiliary normally open contact is closed. The signal is input to PLC's I0.2 and the heater temperature protector I1.1. There is normal input. These two points can be checked on the PLC input / output point. If I1.1 has no input, it means that the heater temperature protector detects that the heater temperature is over-temperature and disconnects. At this time, unplug the wire plugs on the 1 and C pins after power off and use the multimeter resistance range to measure the two pin contacts to see if the resistance is 0 ohms;

[0045] S202: When the above conditions are normal, Q0.1 has output → KA1 is energized → KM1 contactor is controlled to be energized → three-phase 380V AC power is supplied to the SSCR controller as power (this troubleshooting technique is the same as the S10 cooling water pump unit fault detection part), and Q0.0 has output DC24V power (SSCR control signal source); normally, the IN green light on the SSCR controller is on, and the OUT red light is on. If the PLC's Q0.2 has output, and the IN and OUT working operation lights on the SSCR controller are not on, it is necessary to check whether the temperature controller installed on the SSR radiator is activated for protection because the SSCR radiator temperature is detected to be higher than 80 degrees. Use the multimeter DC voltage range red pen to Q0.0 of the terminal block and the black pen to the two pins of the thermostat to measure once. If one of the pins has a DC24V voltage and the other pin has no voltage, it can be confirmed that the thermostat protects the disconnection of the DC24V control signal source of the SSCR, thereby protecting the SSCR from damage. Further inspection of the cooling fan is required;

[0046] S203: Then observe whether the cooling fan on the SSCR controller is rotating. If it is not rotating, use the multimeter AC voltage range to measure the voltage between U5 and N of the terminal block. If the measured voltage is AC220V, the cooling fan is damaged.

[0047] S204: When the SSCR controller normally supplies power to the tank heater, if the heating is not working, the heater needs to be checked. After power off, use the resistance range of the multimeter to measure and check whether the three-phase resistance of the heater U, V, and W terminals is balanced at 16.2 ohms. Further, remove the heater wire box cover and use a 500V megohmmeter to measure whether the resistance to ground is above 0.5 megohms. If the measured resistance value is abnormal, it is determined that the heater is faulty and needs to be replaced with a new heater.

[0048] S300: Electric proportional control valve unit fault detection;

[0049] S301: In the running state, use the DC voltage range of the multimeter to check whether the voltage of the G+ and G0- terminals of the working power supply of the electric proportional valve controller is DC24V; check whether the positions of the 1, 2, 3, and 4 DIP switches in the controller are correct, 1 and 4 are set to OFF, 2 and 3 are set to ON, which is the analog current signal control mode (4-20mA), matched with the control signal source of the equipment;

[0050] S302: Then switch the multimeter to the AC / DC mA range, insert the black pen into the 10A hole, and keep the red pen unchanged. Y and YM on the controller, that is, the PLC analog module output QW62+ and QW62- lines. The QW62+ line at the upper end of the terminal block remains unchanged. Remove the QW62+ line at the lower end of the terminal block and place it. Use a red pen to touch the QW62+ line on the terminal block and a black pen to touch the removed QW62+ line. Let current flow through the multimeter to measure the current signal, which should be between 4-20mA. Check whether the working light in the controller is normally green or flashing red to alarm (abnormal controller analog control signal source, dial setting, controller hardware failure, valve core jamming, and magnetic coil abnormality are all related causes)

[0051] S303: During the control process, check whether the action of the valve core push rod is correct (4mA means the valve core push rod is retracted to the upper position, 20mA means the valve core push rod is pushed to the lower position), and observe whether the valve core is stuck or not; when the valve core push rod does not move, further disassemble the magnetic coil and use the resistance function of the multimeter to check whether the resistance of the magnetic coil is 9.1 ohms and not grounded.

[0052] The method for troubleshooting the failure of the fuel consumption meter's oil outlet temperature to be unable to be controlled can correctly and quickly determine the cause of the failure to control the fuel consumption meter's oil outlet temperature by systematically setting the cooling water pump unit fault detection steps, the heating tank control unit fault detection steps and the electric proportional control valve unit fault detection steps, effectively improving the current troubleshooting methods on the market, reducing the waste of troubleshooting resources, and shortening the troubleshooting cycle, reducing the impact on equipment use.

[0053] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0054] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for troubleshooting a fuel consumption meter failure in which the oil temperature cannot be controlled, characterized in that: The specific steps include: S100: Cooling water pump unit fault detection; S101: After the system is started, check whether the PLC output point Q0.2 has output. If there is no output at the PLC output point Q0.2, the condition is not met, and it is necessary to check whether there is input at the input point I0.5 of the water flow switch; S102: In the power-off state, use the resistance range of the multimeter to measure whether the water flow switch is on, and the resistance value is 0 ohms. When the water flow switch is not on, the operator checks the cooling water Y-type filter element to determine whether the Y-type filter element is blocked; S103: If the PLC output point Q0.2 has output, but the cooling water pump motor does not rotate, the fault is that the intermediate relay KA2, KM2, overload relay FR1 or the motor coil is abnormal; S104: Use the DC voltage range of a multimeter to measure the voltage between Q0.2 and DC0 of the KA2 base. There should be a DC24V voltage. If there is no output, it means the relay contact is faulty. S105: Use the AC voltage range of the multimeter to measure whether the voltage between the A1 and A2 terminals of the KM2 contactor coil is AC220V. If there is no measured voltage, check the thermal overload relay FR1; S106: Then use the red pen of the multimeter to touch the coil A1 terminal 3# of the KM2 contactor, and use the black pen to touch the 95 terminal and 96 terminal of the overload relay FR1 and measure once each to determine whether the overload relay FR1 is operating protection or failure; S107: After the air switch is powered off, use the resistance range of a multimeter to measure the resistance between the three phases of the motor coil. The resistance should be balanced at 15.0 ohms and not grounded. S200: Heating tank control unit fault detection; S201: The heating condition of the heating tank must be that the KM2 of the cooling water pump is energized, and its auxiliary normally open contact is closed. The signal is input to the PLC's I0.2 and the heater temperature protector I1.

1. If there is no input to I1.1, it is judged that the heater temperature protector detects that the heater temperature is over-temperature and disconnects. At this time, unplug the wire plugs on the 1 and C pins after power off, and use the resistance range of the multimeter to measure the two pin contacts to see if the resistance is 0 ohms; S202: After confirming that KM2 of the cooling water pump in step S201 is energized, its auxiliary normally open contact is closed, and I0.2 of the PLC and I1.1 of the heater temperature protector have normal input, the PLC output point Q0.1 has output, which causes KA1 to be energized, and then controls the KM1 contactor to be energized, providing a three-phase 380V AC power supply for the SSCR controller; at the same time, Q0.0 outputs a DC24V power supply as a control signal source for the SSCR; use the DC voltage range of the multimeter, connect the red pen to Q0.0 of the terminal block, and then connect the black pen to the two terminals of the thermostat respectively, and measure each to confirm whether the thermostat has disconnected the DC24V control signal source of the SSCR due to protection; S203: Then observe whether the cooling fan on the SSCR controller is rotating. If it is not rotating, use the multimeter AC voltage range to measure the voltage between U5 and N of the terminal block. If the measured voltage is AC220V, the cooling fan is damaged. S204: When the SSCR controller normally supplies power to the tank heater, if the heating is not working, the heater needs to be checked. After power off, use the resistance range of the multimeter to measure and check whether the three-phase resistance of the heater U, V, and W terminals is balanced at 16.2 ohms. Further, remove the heater wire box cover and use a 500V megohmmeter to measure whether the resistance to ground is above 0.5 megohms. If the measured resistance value is abnormal, it is determined that the heater is faulty. S300: Electric proportional control valve unit fault detection; S301: In the running state, use the DC voltage range of the multimeter to check whether the voltage of the G+ and G0- terminals of the working power supply of the electric proportional valve controller is DC24V; Check whether the positions of the 1, 2, 3, and 4 DIP switches in the controller are correct. Set 1 and 4 to OFF, and 2 and 3 to ON. This is the analog current signal control mode, which is matched with the control signal source of the device. S302: Then switch the multimeter to the AC / DC mA range, insert the black pen into the 10A hole, and keep the red pen unchanged. Find the Y and YM corresponding wiring terminals on the controller, keep the QW62+ line at the top of the terminal block connected, and remove the QW62+ line at the bottom of the terminal block from the terminal and temporarily put it aside. Use the red pen to touch the QW62+ line on the terminal block and the black pen to touch the removed QW62+ line. Let the current flow through the multimeter to measure the current signal. The current value should be between 4-20mA. Check that the working light in the controller is normally green. S303: During the control process, check whether the action of the valve core push rod is correct, and observe whether the valve core is stuck.

2. The method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled according to claim 1 is characterized in that: In step S102, after closing the water inlet valve, use a wrench to remove the Y-type filter, take out the filter element and clean up the scale and garbage to ensure smooth water flow.

3. The method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled according to claim 1 is characterized in that: In step S104, the multimeter needs to be switched to the AC voltage range to measure the 3# line and the N line of the contact. There should be an output AC220V voltage. If there is no output, it means that the relay contact is faulty.

4. The method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled according to claim 1 is characterized in that: In step S106, when AC220V is measured between terminal 95 and no AC220V voltage is measured between terminal 96, it is determined that the thermal relay FR1 is in protection or has failed. At this time, the air switch is turned off and the multimeter is switched to the resistance range for further measurement and inspection of the contacts of terminal 95-96 of the thermal overload relay. The normal value should be 0 ohms.

5. The method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled according to claim 1 is characterized in that: In step S202, normally the IN green light on the SSCR controller is on and the OUT red light is on. If the PLC's Q0.2 has an output, but the IN and OUT working lights on the SSCR controller are not on, it is necessary to check whether the temperature controller installed on the SSR radiator is activated for protection because it detects that the SSCR radiator temperature is higher than 80 degrees.

6. The method for troubleshooting a fuel consumption meter oil temperature failure that cannot be controlled according to claim 1 is characterized in that: In step S303, when the valve core push rod does not move, the magnetic coil is further disassembled and the resistance of the magnetic coil is checked using the resistance range of a multimeter to check whether it is 9.1 ohms and not grounded.

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