L46A1 Mast Section Power supply mode and protective measures of tower crane, function of Emergency Stop Button
tower crane is a large crane equipment, its power consumption is relatively large Therefore, safety protection measures must be safe and reliable. In this paper, the author discusses the power supply mode and protective measures of the tower crane, the function of the Emergency Stop Button, and the two problems with the http://www.fx68.net . The power supply mode and protective measures of tower crane are adopted, the power supply of tower crane is usually supplied by 308V, 50Hz three-phase five-wire exchange power supply, the power supply of construction site should be supplied by three-stage distribution and two-stage maintenance. The Tower Crane shall be equipped with a special switch box, and the voltage stability of the power supply system at the access of the tower crane shall not exceed 10% of the additional value. The power supply capacity should satisfy the lowest power supply capacity of tower crane.
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The insulation resistance of the energy appliance and control circuit to the ground shall not be less than 0.5 m. The Tower Crane shall be provided with short-circuit, over-current, under-voltage, over-voltage and under-voltage protection, zero position protection, power supply phase and open phase protection. Door lock shall be provided for the Electric Control Cabinet (special switch box) . There should be electrical schematic diagram or wiring diagram inside the door, operation instigation, etc. , there should be a warning sign of electrical danger outside the door. Protection level not lower than IP44. The Tower Crane Emergency Stop Button, the tower crane operation installation individual adopts the linkage platform to control, sets the emergency stop button, before the tower crane work must put each organization's operation handle to zero position, prevents the misoperation. In case of emergency, press the emergency stop button of the tower crane to finish all actions.
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