当达到定义的放电条件时，控制仪器会触发光学或声音信号，从而向车辆操作员提醒电池充电情况。对于某些车辆型号，当容量降至临界充电条件以下时，车辆将停止运动。

         Control instrument that triggers an optical or acoustic signal when a defined discharge condition is reached, thus alerting the truck operator about the battery charge condition. For some truck variant the vehicle movements are stopped when the capacity falls below the critical charge condition.