Sensors are widely used to control the operation of industrial cranes. Overhead travelling cranes have different sensor demands, depending on what type of crane it is (eg. double girder overhead travelling crane or half gantry double beam crane), the weight of load it is bearing and its length of travel.
Photoelectric sensors like the XUK9T are employed in anti-collision systems. For example, in a double girder crane, the sensors calculate the distances between each crane, reducing the speed and stopping each one when they reach certain set distances apart.
The XCKVR limit switch is used in ‘trolley travelling’ applications – literally, a movement of the trolley in a transverse direction along the bridge of the crane. By being mounted on the trolley, the limit switch is used to detect the position of the trolley, by providing different state outputs to reduce the speed and stop the trolley.
Limit switches like the XCKD2118P16 roller lever control the vertical movement of the hook. The switches are incorporated in the hoist winch to detect the maximum top position of the hook and the maximum cable length.
Over travel of a crane’s translation movement can be detected by an XCKJ rotary lever limit switch in the control loop. It directly cuts the motor power supply in a case of over travel.