The contactor coil problem of gantry crane

Using a gantry crane, it is inevitable that the following small accidents will occur. As long as we understand the reasons behind them, solving them will be much simpler. Today, we will take a look at the cause of the power failure of the contactor coil of the gantry crane.

1. The vibration generated during the operation of the large vehicle causes the sliding iron to be loosely connected to the guide rail, resulting in power supply problems. This causes the main contact and normally open auxiliary contact of the main contactor to disconnect simultaneously, and the self-locking failure of the main contactor coil leads to power failure.

2. Poor local contact of the sliding iron causes the crane to momentarily lose phase when it reaches a certain section of the sliding rail. If the missing phase happens to be connected to the control circuit, it will cause the coil of the main contactor to be de energized and self-locking to fail. Even if the bridge crane slides over the poor contact due to inertia and regains power, the coil of the main contactor will not be able to self engage and the start button will need to be pressed again.

3. The vibration generated during the lifting of heavy objects by the crane causes the main contactor to not be firmly engaged, and both the main contact and the normally open auxiliary contact are disconnected due to the vibration. The self-locking of the main contactor coil fails and the power is cut off.