When troubleshooting a lost step issue, first determine whether the stepper motor itself is losing steps or if the error originates from the mechanical equipment. Perform the following test:
Set the acceleration, deceleration, and operating speed in the host controller to lower values. Create a motion program, mark the starting position and the zero position of the motor, and then run the program repeatedly. After several hours of operation, check whether any deviation exists between the mark and the zero position.
If there is no deviation, the original speed setting was too aggressive, placing the motor's torque output near its critical limit. The motor could not deliver sufficient torque, causing it to lose step. In this case, reduce the operating speed or replace the motor with a larger model.
If there is a deviation, the motor or driver may be faulty. Swap in a known-good motor or driver and retest to determine whether the deviation disappears, thereby isolating the faulty component.
Additionally, check whether the motor is affected by electromagnetic interference from other equipment. Try grounding or shielding the motor and driver cables, and relocate them away from high-power devices to see if the lost step issue is resolved.