| 摘要 |
Crane warning system operative to give audible and visual warning of an imminent 2-BLOCK condition and to prevent occurrence of an actual 2-BLOCK condition by means of a control output signal. The warning system is further operable to permit override of the indication of and control against the 2-BLOCK condition. Three distinct audible and visual indications are provided for NORMAL, 2-BLOCK, and OVERRIDE system states. The system is further operative to automatically reset to a NORMAL state from either a 2-BLOCK or OVERRIDE state upon sensing a transition from a 2-BLOCK condition to a NORMAL condition. |
