Pre-excitation is the process to control current while a motor is stopped so that motor torque can be generated immediately.
There are two methods for this pre-excitation: (1) Zero-speed control and (2) Servo lock.

1. Zero-speed control:
By the speed control, giving a speed command with 0 rpm to the motor (controlling to stop the motor), motor torque is generated while the motor is not rotating. When an external force is applied to the motor and it moves, retention torque occurs at the new position but the motor does not return to the original position.

2. Servo lock
By controlling the position where the motor is stopped, torque to stop the motor is generated.
Therefore, when servo lock is chosen and a load is applied to the motor and it moves momentarily, the motor returns to the original position.

To enable pre-excitation, use Pr.17 (Input terminal assignment) to assign LX (pre-excitation) any of DI1 to DI3 and turn ON the signal between the terminals LX and SD.
Choose from zero-speed control or servo lock by Pr.62 (Pre-excitation selection).