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Do not reverse the power input,input voltage should not exceed DC40V.Input logic should be 5V,otherwise it should connect a resistor.Due to the special control circuit, this module only for 6 leads or 8 leads step motors.O.H is malfunction indicator. Once the driver temperature exceeds 70°C,the current will be cut off automatically and the driver resume working till the temperature drops to 50°C. If this happens,please install ventilation equipment.