What are the reasons why the overhead crane cannot descend?

[AdalineAnn]

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.