Belt conveyor is introduced into advantages of PLC control system, and more and more a necessity. Because the wire rope traction belt conveyor as the main transport equipment of coal mine, assuming the task of coal for transportation and personnel, its reliability is directly related to the life and property safety. Due to the poor working conditions factory belt conveyor, belt skid happens often, broken belt, over load, coupling disconnected, such as failure, serious impact on production. In order to be able to effectively to monitor belt conveyor, should first analyze the fault belt conveyor. The original belt transport control system made up by relay connection, this kind of system function is poor, maintenance trouble, operation mode is not flexible. Belt conveyor the execution of the relay contact easy burning, the motor can't stop in time, which can lead to accidents. Introduce programmable controller PLC can solve the above problems. Based on the experience of many years application of programmable controller, PLC control system can be divided into four RACES. The protection content are as follows: the belt running deviation, belt control circuit fault, fault belt control circuit, position signal loss, stacking, full signal, etc. The characteristics of the system are: stable performance, strong ability and high technical content, repair, maintenance, system convenient and flexible, able to timely and accurately reflect fault belt and protected type, having serious accident to stop in time, send out sound and light alarm signal, and can meet the needs of production, ensure the safe and normal operation of belt conveyor, with higher applicability and application value.

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