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