Main functions of the system 1, display-visually display the actual lifting weight, rated lifting weight, arm length, angle, working conditions, ratio and other crane operating parameters. 2. Pre/alarm the Tlx55 torque system gives a sound/light alarm when the crane experiences any of the following conditions. - crane torque overloading-crane hoist overrun-force limiter system failure 3, control with the crane electrical system, when the system alarm, any of the following dangerous direction operations are prohibited:-boom down luffing-boom extended-spreader raised at this time, the system only allows safe direction of operation, that is:-boom up luffing-boom retraction-spreader down