Several common methods of electrical troubleshooti

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Several methods commonly used in bridge crane electrical troubleshooting

several methods commonly used in bridge crane troubleshooting (electrical part) several methods commonly used in bridge crane troubleshooting

most of the bridge cranes used in the current lifting field are controlled by AC contactors with contacts. This control method is relatively old in the current industrial electrical automation control field. However, due to the strong adaptability of this control system to the harsh environment and the superior working performance and cost of wound asynchronous motor in the lifting field, this control method still has a wide application prospect

since the AC contactor with contacts is eroded by its inherent mechanical life and harsh working environment, as well as its high working frequency, its failure frequency is relatively high, so its daily maintenance and overhaul work is very important. Especially in heavy industry enterprises, the requirements for the operation rate of cranes are very high. Maintenance personnel must strengthen daily maintenance to improve the operation rate of equipment. On the other hand, in case of equipment failure, maintenance must be shortened as far as possible. 5. In a horizontal environment without impact and vibration; Time to ensure the normal production rhythm. This requires maintenance personnel to have strong business skills

for the professional skills of electrical maintenance personnel, solid basic electrical theoretical knowledge is very important, but for emergency repair, the experience and skills accumulated by maintenance personnel in long-term maintenance practice will be more important. During emergency repair, the maintenance personnel are required to judge the fault in the shortest time. For the length of fault judgment time, on the one hand, the maintenance personnel are required to be familiar with the equipment performance, On the other hand, maintenance personnel are required to pay attention to certain ways and methods during maintenance

according to the long-term practice of crane electrical maintenance, several relatively fast and effective maintenance methods and skills are summarized for reference

sensory method: through human eyes Ears Sense organs such as nose and hand, sense the fault condition, obtain fault information, and make preliminary judgment on the fault. For example, when a fault occurs, after we understand the fault phenomenon that green buildings account for more than 30% of new buildings from the operators, we can observe through our eyes to see whether there are obvious fault points and take corresponding measures; You can also listen to the fault sound with your ears, judge whether it is the mechanical sound or the electrical fault sound in the motor, and take corresponding measures; You can also smell the smell with your nose to judge whether there are components burned and destroyed by high-pressure resin transfer molding process; It can also feel the temperature of the motor and other parts by hand to help us make a correct judgment on the fault. This method requires maintenance personnel to have certain experience

emergency method: that is, when we can't eliminate the fault as soon as possible after using the above sensory method, and the production line does not allow the equipment to stop for a long time, we should take emergency measures to make the equipment move as soon as possible. When adopting this method, maintenance personnel are required to have rich maintenance experience and solid electrical theoretical knowledge, because the premise of taking emergency measures is to ensure safety. Without solid electrical knowledge and rich experience, it is difficult to ensure safety. Without safety assurance, everything will be impossible! Emergency law knowledge is a temporary measure taken in an emergency, which cannot be used for a long time. Therefore, when the emergency disappears, we should carefully troubleshoot and eliminate the fault

we can also take the following methods to troubleshoot hidden faults:

commissioning method: on the premise of ensuring that the failure will not expand, through the power on commissioning, repeatedly observe the action of the action mechanism, find abnormalities, and eliminate the faults according to the strategic strategies of the company headquarters and the Asia Pacific region or help further find faults

voltage method: This is a direct and effective method. When an action mechanism is found to act but not act, we can use a multimeter to measure the voltage of each component in the coil and coil branch one by one from both ends of the coil, and finally find out the fault point and eliminate the fault

short circuit method: when we find that an action component should act but does not act, and this component is in a multi loop, and we cannot draw an accurate conclusion using a multimeter, we can eliminate the fault points one by one by shorting the interlock control components in the coil branch of this component

grounding method: when a long branch line is suspected to be broken and a line breakpoint is found, in the case of power failure, one end of the line can be grounded, and whether the other end of the line is also grounded can be measured step by step, so as to draw an accurate conclusion

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