First return to zero and then test the upward value. The deviation is periodic

You can refer to the following methods for step-by-step troubleshooting

Unstable transmission pulse signal: the movement of the stepper motor needs stable pulse signal drive. If the pulse signal is unstable, it may cause the movement of the motor to be unstable, with periodic changes. It is recommended to check the relevant pulse signal lines and take shielding measures as far as possible to reduce the impact of interference on the signal.

Motor driver problem: The stepper motor driver is the key component to control the movement of the stepper motor. If the driver has problems, such as improper current setting, unstable power supply voltage of the driver, etc., it may lead to unstable movement of the motor and periodic changes. It is recommended to check the status of the drive and adjust the current, voltage and other parameters as much as possible to make it operate normally.

Mechanical component problems: the stability of the stepper motor movement is also related to the state of mechanical components, such as bearing wear, uneven guide rail, etc., which may also lead to the motor movement instability and periodic changes. It is recommended to check the condition of mechanical parts and replace or repair them in time.

Controller problem: If the controller has problems, such as controller chip failure, program error, etc., it may also lead to unstable motor movement and periodic changes. It is recommended to check the status of the controller and whether the control procedure is correct.