Although I am not an avid poster, I spend a lot of time reading. My previous experience involved working for a company that specializes in building modular units for hospitals. During this time, I frequently witnessed cranes being used to lift and position these units, often observing operators taking risks that seemed unbelievable. I am curious about how the override function works on cranes. Does the onboard computer automatically disable the system when it reaches its maximum capacity, requiring the operator to use the override function to continue exceeding the limit? If this override is meant as a safety feature, why would it be necessary to use it in the first place?
The Load Moment Indicator (LMI) or anti-two block override feature is designed as a safety measure in case of a system malfunction preventing the machine from lowering the boom or raising the cable. It is not recommended to rely on this feature to extend the reach of the load.
During our load testing procedures at work, the cranes are placed in override mode to conduct the test efficiently. We raise 110% of the crane's rated load during the test, which it handles with ease. It is crucial for operators to never exceed the maximum load capacity of any crane they operate to prevent potential accidents and injuries. Overloading a crane indicates a reckless disregard for safety protocols and puts lives at risk.
If you encounter a situation where the crane is in continuous two block operation, the override key on the panel can help you proceed with caution. By turning the key and holding down a button, you can temporarily disable the system while still receiving warning signals. This is crucial for tasks that require the computer to be turned off for extended periods, such as when the crane is beeping continuously for at least 30 minutes during operation. In such instances, using the panel override may not be possible due to the height of the lifts, which can reach over 80 feet near the ceiling. It is important for the signal person to closely monitor the boom tip, especially when working in close proximity to it. While most companies do not leave the computer key in the machine, it is a necessary option for certain jobs like this. In some cases, companies may remove both the panel and computer keys for safety reasons.
The use of the override function in crane maintenance and during system failures is essential. However, it is strongly advised against overriding the safe load system to complete a lift. Many crane operators resort to using the override key or leaving the system in override mode for various reasons. Having traveled extensively across Europe, the United States, Canada, and South America to troubleshoot LMI systems and electronic controls in cranes, I have observed that around 70% of cranes I encounter have the override feature activated. This led to the implementation of the new European EN13000 regulation for building cranes, which mandates the placement of the override key outside the cabin and the use of a set-up switch to limit operational speed and functions when operated from within the cabin. Moreover, modern cranes now come equipped with a data logger that records crucial operational data such as radius, load on the hook, outrigger configuration, and the function being used. This data serves as a backup for manufacturers in the event of accidents or warranty claims. Additionally, upcoming crane models will feature telemetry data for more efficient fleet management. It is crucial for every crane operator to prioritize the safety of all team members at the job site. Remember, safety always comes first! For more information, visit www.cranetools.com.
I would never use a crane to exceed its maximum load capacity, but rather to precisely position the load at the required height. The maximum load for that configuration was 11,600 pounds, with most loads falling in the 6,000-pound range and a few at 8,000 pounds. I captured a photo of the LMI with 94 feet of boom, 91 feet from the floor to the center of the sheave, and at a 62-degree angle. The finished height of the steel reached 80 feet, with the boom extended out by 6 inches and the load lowered by 6 inches. It took around 30 to 40 movements to position the 26-foot-tall cage structure measuring 10 feet by 10 feet. I appreciate the feedback provided by the LMI system and even discussed the possibility with the boss of accessing override information by downloading data from the computer.
Answer: 1. How does the override function work on cranes? - The override function on cranes typically allows operators to exceed the maximum capacity set by the onboard computer, providing manual control when necessary.
Answer: - Yes, the onboard computer is designed to disable the system when the crane reaches its maximum capacity to prevent overloading and ensure safety.
Answer: - The override function is used as a safety feature to provide manual control in situations where exceeding the maximum capacity is required for specific tasks, such as unusual lifting scenarios or emergencies.
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