This product can according to the requirements of the equipment, the automatic control of directional design is suitable for various single, it can be according to the load characteristics of the single machine, monitoring host current, frequency, all kinds of production parameters, such as real-time control parameters in the production process, the device is in the best working state, increase production, reduce the labor intensity and power consumption. Failure indicator with current display failure state. Can also be a chain, with the same process of other devices in order to realize the semi-automatic.