Contactor coil issue of gantry crane

The use of gantry cranes inevitably leads to the following minor accidents. As long as we understand the underlying causes, solving them becomes much simpler. Today, let's follow the Shandong gantry crane manufacturer to understand the reasons for the coil de-energization of the contactor in a gantry crane.

1. The vibration generated during the operation of the crane causes the sliding iron to become loosely coupled with the guide rail, leading to power supply issues. This, in turn, results in the simultaneous disconnection of the main contact and the normally open auxiliary contact of the main contactor, causing the self-locking of the main contactor coil to fail and resulting in power loss.

2. Poor contact in the slide rail can cause the crane to experience an instantaneous phase loss when traveling to a certain section of the slide rail. If the missing phase happens to be connected to the control circuit, it will cause the coil of the main contactor to lose power and fail to self-lock. Even if the bridge crane regains power after sliding past the poor contact area due to inertia, the main contactor coil will not be able to engage automatically, requiring the start button to be pressed again.

3. The vibration generated by the crane when lifting heavy objects causes the main contactor to fail to engage securely. Both the main contact and the normally open auxiliary contact are disconnected due to the vibration, leading to the failure of the self-locking mechanism of the main contactor coil and subsequent power loss.