Stepper motor 1)The suitability of supply voltage,Overpressure is likely to cause the damage to the driver module); + / - about the dc inputThe polarity will not wrong, on the motor drive controller model or the suitability of current value (At the beginning not too big); 2)Reliable control signal lines, industrial site best shield to consider (If use twisted pair); 3)Don't take demand at the beginning of the line up, all together as only the most basic system, outstanding after the operation, then gradually cohesion. 4)Must understand grounding method, is still using floating don't pick up empty. 5)Running half an hour to close observation of the condition of the motor, such as movement is normal, voice and temperature rise, found the problem immediately stop adjustment.