Check the reason why the stepper motor is not working properly:

1. Whether the motor torque is large enough to drive the load? Therefore, we generally recommend a motor with a torque higher 50%~100% than the actual one because the stepper motor can't be overloaded, even if it is instantaneous, it will cause a loss of step, even an irregular movement.

2. Whether the current of the input walking pulse from the upper controller is large enough (generally >10mA) to stably turn on the the optocoupler. If the input frequency is too high, it will result in receving no signal; if the output circuit of the upper controller is CMOS circuits, CMOS input drivers are also required.

3. Whether  the starting frequency is too high and whether the acceleration process is set in the startup program? It is better to start the acceleration from the starting frequency specified by the motor to the set frequency. Even if the acceleration time is short, it may be unstable or even in a passive state.