When operating stepper motors, three different current settings are used:
While the run current is active during motor driving operation, the stop current is impressed during motor standstill. When the motor has stopped, we advise to change to a reduced stop current after a "current delay time". Through this the thermal losses in the motor are reduced during standstill. During acceleration or deceleration a stepper motor needs, compared to steady running, more torque and therefore a higher current. So it is recommended to raise the run current to boost current during acceleration and deceleration. Additionally, the stop current should be set to the lowest possible value to keep the motor heating as low as possible.