Commonly Used Methods For Troubleshooting Of Bridge Cranes

Commonly Used Methods For Troubleshooting Of Bridge Cranes

 

(Electrical Part) Several Commonly Used Methods for 75 ton Overhead Crane Troubleshooting

 

Most of the electrical control methods of bridge cranes used in the current lifting field are still controlled by AC contactors with contacts.

 

This control method is relatively old in the current field of industrial electrical automation control, but due to the strong adaptability of this control system to harsh environments, the wound asynchronous motor has superior working performance and low cost in the lifting field. And other reasons, this control method still has a broad application prospect.

 

Since the AC contactor with contacts is eroded by its inherent mechanical life and harsh working environment, as well as its high operating frequency, its frequency of failure is relatively high, so it is very important to carry out daily maintenance and repair work.

 

Especially in heavy industry enterprises, the operating rate of cranes is very high. Maintenance personnel must strengthen daily maintenance to improve the operating rate of equipment. On the other hand, when equipment fails online, the maintenance time must be shortened as much as possible to ensure normal operation. production rhythm. All these require maintenance personnel to have strong business skills.

 

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

 

 

Based on the long-term practice of crane electrical maintenance work, our company has summarized several relatively fast and effective maintenance methods and techniques for reference.

 

Sensory method: through human eyes, ears, nose, hands and other sensory organs, perceive the fault status, obtain fault information, and make a preliminary judgment on the fault.

 

For example: when a certain failure occurs, after we understand the failure phenomenon from the operator, we can observe with our eyes to see if there is an obvious failure point and take corresponding measures;

 

You can also listen to the fault sound with your ears to judge whether it is a mechanical sound or an electrical fault sound in the motor, and take corresponding measures;

 

You can also smell the smell with your nose to judge whether there is a component burnt, etc.;

 

You can also feel the temperature of the motor and other components with your hands to help us make a correct judgment on the fault.

 

This method requires maintenance personnel to have certain experience.

 

Emergency method: When we still cannot eliminate the fault as soon as possible after using the above sensory methods, and the production line does not allow the equipment to stop for a long time, we must take emergency measures to start the equipment 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 establish safety under the premise of ensuring safety. Without solid electrical knowledge and rich experience, it is difficult to Guarantee safety, without the guarantee of safety, everything will be out of the question!

 

The temporary measures taken by emergency law knowledge in emergency situations cannot be used for a long time, so when the emergency situation disappears, we must carefully troubleshoot and eliminate faults. To troubleshoot more hidden faults, we can also take the following methods:

 

 

Test run method: under the premise of ensuring that the fault will not expand, through the power test run, repeatedly observe the action of the action mechanism, find abnormalities, eliminate faults or help further find faults.

 

Voltage method: This is a direct and effective shortcut method. When an action mechanism is found to be in action but not in action, we can use a multimeter to measure the voltage of the coil and each component in the coil branch one by one starting from both ends of the coil. Finally find out the point of failure and troubleshoot.

 

Short-circuit method: When we find that an action element should act but does not act, and this element is in a multi-circuit, and the use of a multimeter cannot draw an accurate conclusion, we can short-circuit the interconnection in the coil branch of the element. Lock the control components and eliminate the fault points one by one.

 

Grounding method: When it is suspected that there is a disconnection in a long branch line and the line breakpoint is searched, in the case of power failure, one end of the line can be grounded, and the other end of the line can be measured step by step whether it is also grounded, so as to draw an accurate conclusion .

 

The above is only a small part of the maintenance methods, there are many methods, which requires us to constantly think and summarize.

 

Note: Our company recommends that all operations need to be performed by professionals, and everything is based on your own safety.