... lifting. 2, There is Electro-optical Sensor Protection System (patent number: ZL 2010 2 0128833.3) ... (especially for cold rolling coil). 3, Electrical system is controlled by PLC and provide generic interface, ... & Work" function. 4, There is torque limiter system to prevent the damage by Lock-Rotor, it make ... the motor durable. 5, There is ratchet system to prevent the coil lifter open its ...