10月20日の日記
2020年10月20日When the elevator control circuit fails, we should ask, watch, listen, and listen first to make sure we have a good idea. The so-called question is to ask the operator or the person who reported the fault when the fault occurs, and ask whether any adjustments or replacements have been made to the components before the fault occurs. The so-called perception is to observe whether each part is changed. For normal operation, check whether the various signal indications of the control circuit are correct, and whether the appearance and color of the electrical components change. The so-called listening is to hear whether there is abnormal sound when the circuit is working; the so-called smell is to hear whether there is any abnormal sound when the circuit is working. The circuit components have a peculiar smell. After completing the above work, China Home Elevator Factory reminds that the following methods can be used to find the fault of the electrical control circuit.
1. Sequence inspection method: The elevator runs according to a certain procedure, and each run has to go through the cyclic process of layer selection, orientation, door closing, starting, running, speed change, leveling, and door opening. Each step is called a working link. , To achieve each working link, there is an independent control circuit. The procedural inspection method is to confirm the specific control link of the fault, so that the direction of troubleshooting is clear, and it is very important to eliminate the fault with pertinence. This method is not only suitable for electrical control systems with contacts, but also for non-contact control systems, such as PC control systems or single-chip control systems.
2. Static resistance measurement method: The static resistance method is to use a multimeter resistance file to measure the resistance of the circuit when the power is off, because any electronic component is made of a PN structure, and its forward and reverse resistance values are The difference is that any electrical component also has a certain resistance value. The resistance value of the circuit or switch connected to the electrical component is either zero or infinite. Therefore, it can be judged whether the resistance value meets the specified requirements. This method can also be used to check whether an electronic circuit is good or not, and it is safer.
3. Potential measurement method: When the above method cannot determine the fault location, the potential at both ends of each electronic or electrical component can be measured under the power-on condition, because under normal working conditions, the potential of each point on the current closed-loop circuit is constant. The so-called potential of each point means that the potential of each point on the circuit element to the ground is different, and there is a certain size requirement. The current flows from a high potential to a low potential, and the potential of the electrical and electronic components should be measured in the direction of the current. Rule, so use a multimeter to measure whether the potential of the relevant point on the control circuit meets the specified value, you can determine the point of the fault, and then determine why the current value changes, whether the power supply is incorrect, the circuit is open, or the component is damaged Caused.
4. Short circuit method: The control link circuit is a combination of switches or relays and contactor contacts. When it is suspected that one or some contacts are faulty, the contact can be short-circuited with a wire. At this time, if the fault disappears when the power is turned on, the judgment is correct, indicating that the electrical component is broken. But keep in mind that when the fault point is found, the short wire should be removed immediately after the test is completed, and it is not allowed to replace the switch or switch contact with the short wire. The short circuit method is mainly used to find the breakpoint of the electrical logic circuit. Of course, this method can also be used to measure the fault of the electronic circuit.
The following introduces the short-circuit method to find the fault of the door lock circuit. On the top of the car, use the inspection to jog the elevator to run, run to a certain floor at the inspection speed, open the automatic door lock protection panel, connect one end of the short wire to line 01, and check whether the contact is normal at the other end. When the short wire touches B Point C pulls in, but touch A point C does not pull, indicating that the door layer lock contact is broken. Loosen the short wire, repair the contact or replace the door lock switch. But with the short-circuit method, you can only find the breakpoint of the "AND" logic contact, but not whether the relay coil is short-circuited, otherwise the power supply will be burned out.
5. Circuit breaking method: The control circuit may also have some special faults, such as stopping the elevator floor without internal selection or external call instructions. This indicates that some contacts in the circuit are shorted. The best way to find this type of fault is to open the contact suspected of causing the fault. If the fault disappears, the judgment is correct. The circuit breaking method is mainly used for the fault point of the "AND" logical relationship.
6. Replacement: It is found that the fault originates from a certain point or circuit board. At this time, the component or circuit board that is considered to be faulty can be removed and replaced with a new or confirmed non-faulty component or circuit board. If the fault disappears, the judgment is correct. Instead, it is necessary to continue the search. Maintenance personnel often have spare parts for wearing parts or important electronic boards. Once a failure occurs, they can immediately replace a part to solve the problem. If faulty parts are brought back, they can be searched and repaired slowly. This is also a quick troubleshooting method.
7. Experience exclusion: In order to quickly eliminate accidents, we must not only continue to summarize our own practical experience, but also continue to absorb the practical experience of others. Practical experience often leads to regular summary of elevator failures. Some experience is an important lesson in exchange for sweat and blood. We should also pay more attention. Usually, this experience can quickly troubleshoot and reduce accidents and losses. Of course, strictly speaking, elevator accidents should be eliminated, which is the responsibility of maintenance personnel.
8. The basic idea of troubleshooting the electrical system: the electrical control system sometimes has complex faults, and now the elevator is controlled by a computer. The software and hardware are crossed together. When encountering errors, we should not be nervous at first. When troubleshooting, we should adhere to the principle of “easy first, then difficult, first outside and then inside, comprehensive consideration, and unity”. Many faults in elevator operation are caused by poor contact of the switch contacts. Therefore, when judging the fault, we must first base on the fault condition and the indicator lights in the cabinet, that is, door contacts, safety circuits, AC and DC power supplies, as long as we are familiar with Circuit, you can quickly touch melon. solve.
The above content is organized and shared by Bed Elevator Supplier, hoping to help those in need.
1. Sequence inspection method: The elevator runs according to a certain procedure, and each run has to go through the cyclic process of layer selection, orientation, door closing, starting, running, speed change, leveling, and door opening. Each step is called a working link. , To achieve each working link, there is an independent control circuit. The procedural inspection method is to confirm the specific control link of the fault, so that the direction of troubleshooting is clear, and it is very important to eliminate the fault with pertinence. This method is not only suitable for electrical control systems with contacts, but also for non-contact control systems, such as PC control systems or single-chip control systems.
2. Static resistance measurement method: The static resistance method is to use a multimeter resistance file to measure the resistance of the circuit when the power is off, because any electronic component is made of a PN structure, and its forward and reverse resistance values are The difference is that any electrical component also has a certain resistance value. The resistance value of the circuit or switch connected to the electrical component is either zero or infinite. Therefore, it can be judged whether the resistance value meets the specified requirements. This method can also be used to check whether an electronic circuit is good or not, and it is safer.
3. Potential measurement method: When the above method cannot determine the fault location, the potential at both ends of each electronic or electrical component can be measured under the power-on condition, because under normal working conditions, the potential of each point on the current closed-loop circuit is constant. The so-called potential of each point means that the potential of each point on the circuit element to the ground is different, and there is a certain size requirement. The current flows from a high potential to a low potential, and the potential of the electrical and electronic components should be measured in the direction of the current. Rule, so use a multimeter to measure whether the potential of the relevant point on the control circuit meets the specified value, you can determine the point of the fault, and then determine why the current value changes, whether the power supply is incorrect, the circuit is open, or the component is damaged Caused.
4. Short circuit method: The control link circuit is a combination of switches or relays and contactor contacts. When it is suspected that one or some contacts are faulty, the contact can be short-circuited with a wire. At this time, if the fault disappears when the power is turned on, the judgment is correct, indicating that the electrical component is broken. But keep in mind that when the fault point is found, the short wire should be removed immediately after the test is completed, and it is not allowed to replace the switch or switch contact with the short wire. The short circuit method is mainly used to find the breakpoint of the electrical logic circuit. Of course, this method can also be used to measure the fault of the electronic circuit.
The following introduces the short-circuit method to find the fault of the door lock circuit. On the top of the car, use the inspection to jog the elevator to run, run to a certain floor at the inspection speed, open the automatic door lock protection panel, connect one end of the short wire to line 01, and check whether the contact is normal at the other end. When the short wire touches B Point C pulls in, but touch A point C does not pull, indicating that the door layer lock contact is broken. Loosen the short wire, repair the contact or replace the door lock switch. But with the short-circuit method, you can only find the breakpoint of the "AND" logic contact, but not whether the relay coil is short-circuited, otherwise the power supply will be burned out.
5. Circuit breaking method: The control circuit may also have some special faults, such as stopping the elevator floor without internal selection or external call instructions. This indicates that some contacts in the circuit are shorted. The best way to find this type of fault is to open the contact suspected of causing the fault. If the fault disappears, the judgment is correct. The circuit breaking method is mainly used for the fault point of the "AND" logical relationship.
6. Replacement: It is found that the fault originates from a certain point or circuit board. At this time, the component or circuit board that is considered to be faulty can be removed and replaced with a new or confirmed non-faulty component or circuit board. If the fault disappears, the judgment is correct. Instead, it is necessary to continue the search. Maintenance personnel often have spare parts for wearing parts or important electronic boards. Once a failure occurs, they can immediately replace a part to solve the problem. If faulty parts are brought back, they can be searched and repaired slowly. This is also a quick troubleshooting method.
7. Experience exclusion: In order to quickly eliminate accidents, we must not only continue to summarize our own practical experience, but also continue to absorb the practical experience of others. Practical experience often leads to regular summary of elevator failures. Some experience is an important lesson in exchange for sweat and blood. We should also pay more attention. Usually, this experience can quickly troubleshoot and reduce accidents and losses. Of course, strictly speaking, elevator accidents should be eliminated, which is the responsibility of maintenance personnel.
8. The basic idea of troubleshooting the electrical system: the electrical control system sometimes has complex faults, and now the elevator is controlled by a computer. The software and hardware are crossed together. When encountering errors, we should not be nervous at first. When troubleshooting, we should adhere to the principle of “easy first, then difficult, first outside and then inside, comprehensive consideration, and unity”. Many faults in elevator operation are caused by poor contact of the switch contacts. Therefore, when judging the fault, we must first base on the fault condition and the indicator lights in the cabinet, that is, door contacts, safety circuits, AC and DC power supplies, as long as we are familiar with Circuit, you can quickly touch melon. solve.
The above content is organized and shared by Bed Elevator Supplier, hoping to help those in need.
コメント