In some engineering processes, there may be situations where the operating instructions do not match the actual response of the electric hoist, manifested as the direction of the handle operation not being synchronized with the action of the electric hoist, for example, when attempting to lift, the electric hoist begins to descend. What is the reason behind this? How should we solve it?

The primary direction for troubleshooting such problems is the control circuit. After inspection, it was found that the internal control circuit layout of the control box preset by the manufacturer was chaotic, and the installation was not strictly carried out according to the drawings. In addition, there was a mismatch between the connection position of the handle control line and the handle identification. Therefore, we have conducted a comprehensive rewiring and control circuit adjustment of the control boxes for all the electric hoists on the front end.

However, even after optimizing the control loop, the problem still exists, which suggests that the issue may not lie in the wiring. After further investigation, we speculate that it may be caused by a short circuit in the circuit. By inspecting the wiring from the control box to the handle one by one, we found that the inside of the handle had been severely corroded, which caused a short circuit in the circuit and led to the disorder of the electric hoist movement.

Through in-depth analysis, we realize that this situation may be closely related to environmental factors. Especially in coastal areas, metal parts are more prone to rusting due to frequent rainfall, sandstorms, and high humidity environments. To solve this problem, we have rust removed the handle of the outdoor electric hoist or replaced it with a new one if necessary. In order to prevent similar problems from happening again, we also use plastic protective covers to protect the handle, reducing the impact of moisture and corrosive substances on it.