What are the reasons why the overhead crane cannot descend?
3 Answers
The reasons why the overhead crane cannot descend are as follows: Electrical faults: Fault phenomenon: All motors of the overhead crane cannot operate, or a certain motor cannot operate. Fault reason: Phase loss Common fault points: Poor power supply circuit breaker; a certain sliding knife falls off; damage to the motor control contactor; loose power connection screws on the overhead crane sliding knife track; damage to a certain strand of the connecting cable between the north and south distribution boxes; damage to a certain component of the overhead crane remote control receiver. Mechanical faults: Fault phenomenon: The overhead crane lifting or descending is not in place. Fault reason: Improper adjustment of the limit switch; poor winding of the wire rope. Maintenance treatment: Readjust the upper and lower limit positions; adjust the winding state of the wire rope, and replace it in time if it is worn. Pay attention not to pull too obliquely when lifting.
I once encountered a situation where the overhead crane couldn't descend, mainly caused by mechanical parts getting stuck or insufficient lubrication. For example, air might have entered the hydraulic cylinder, affecting the descending motion; or the chain might have rusted and jammed, requiring timely cleaning and oiling. Another common issue is a faulty limit switch, where the safety device triggers and restricts the descending operation. During maintenance, it's essential to regularly inspect these areas and keep the overhead crane well-lubricated. In daily use, avoid overloading operations, as this can easily wear out the gears and exacerbate the problem. Operator training is also crucial to ensure the correct use of switches. Overall, if you find that the crane cannot descend, stop using it immediately and call a professional technician for inspection—safety first.
As a worker who frequently operates overhead cranes, I've noticed that such issues often occur when buttons malfunction or the control panel fails. For example, the descent button may have poor contact and not respond when pressed, or the controller may lose its signal, causing the motor to stop responding. Worn-out or short-circuited wiring is also common, leading to blown fuses. I recommend first checking the buttons and wiring to ensure tight connections. During daily operations, pay attention to cleaning the control console to reduce dust buildup. Other possible causes include the height limit device being triggered to prevent accidental descent. These small details are easily overlooked, but timely troubleshooting can save time and avoid affecting production schedules.
