Crane Truss Reel Beam Sensor

    The core working logic of the limit switch for the bridge crane produced by CTECH Machinery SDN BHD is as follows:
     Displacement detection: When the crane's large, small or lifting mechanism moves, it drives the collision ruler/collision block fixed on it to approach the limit switch, or senses the height change through the wire rope/heavy hammer linkage device.
     Contact conversion: When the collision block contacts the switch roller/lever (or the heavy hammer is lifted), the internal micro switch deforms, disconnecting the normally closed contact (cutting off power) and closing the normally open contact (triggering an alarm or secondary deceleration).
     Execution protection: After receiving the signal, the control system immediately cuts off the power supply of the motor in that direction and applies the brake. Some designs will trigger the deceleration limit first and then the limit limit, achieving graded protection. ‌‌
Key safety characteristics of limit switches for bridge cranes:
     Dual limit configuration: Newly manufactured bridge cranes typically require the installation of two different principles of height limit devices (such as heavy hammer type and shut-off type) to prevent single failure.
     Unidirectional cut-off: After the limit action, only the power supply in the dangerous direction (such as upward or forward) is cut off, and the reverse operation permission is retained for resetting.