Operation without encoder

When operating without encoder, the impulses generated by the terminals are sent to the CNC-internal position controller as actual position. The velocity command values calculated by the position controller are output to the stepper motor terminal and cause the stepper motor to move.

Since the drive is operated in a pseudo position control loop, the stepper motor is parameterised in the axis parameter list similarly to the parameter definition of a drive with +/-10 V interface. This also takes place when velocity feedforward control is used.

Attention

In this operation mode, there is no real axis position feedback. Axis position lag monitoring is not possible.

Since a stepper motor stands still in the event of dynamic overload or it can lose steps (stepper motor falls out of step), special care is required when dimensioning the motor and parameterising the dynamic parameters of the motor.