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Gantry crane zero protection

Sep 30, 2019
The gantry crane mechanism motor is controlled by a controller that cannot be automatically reset. In order to prevent the controller handle from being in the zero position, the crane power supply loses pressure and then restores the power supply, causing the motor to start incorrectly, and the cantilever crane is provided with zero protection. Zero protection inspection method:
 
1. The gantry crane mechanism motor is directly controlled by the cam controller; when the total power supply is turned off, and one of the controller handles is pulled away from the zero position; when the total power supply is connected, the power supply should not be turned on, and all controller handles are placed zero position, the total power can be turned on.
 
2. The gantry crane mechanism motor is controlled by the master controller and the contactor. Turn off the main power supply, pull the master controller away from the zero position, and turn on the main power. When the main power is turned on, the mechanism motor cannot be started at the same time.
 
single girder gantry crane
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