"SET_POINT" mode

"SET_POINT" mode (P-AXIS-00753) is based on the same principle as "INDIRECT" mode.

As you can see in the figure above, mechanical vibration is also simulated in "SET_POINT" mode. The difference between this mode and "INDIRECT" mode lies in the values on which the simulation is based:

"SET_POINT" mode uses the command speeds from the position controller directly. This avoids the dead time caused by the measurement and transfer of the actual speed.

Advantage of "SET_POINT" mode

The output additive speed values are therefore somewhat faster than in "INDIRECT" mode. As a result, the phase shift plays a minor role and higher frequencies can be damped.

Another advantage of "SET_POINT" mode is that the drive is not excited to vibrate due to feedback of the actual values. On the downside, information that "INDIRECT" mode obtains by using the actual values of the motor is lost.

Attention

At high frequencies, a phase shift of the output additive speed may occur due to the dead time of the simulation.

Consequence: Vibrations may be intensified instead of being damped.

Attention

Low damping ratios may cause the output of high additive speeds.

Consequence: The drive may be excited to vibrate.