Siemens SINUMERIK 840D sl Commissioning Manual page 343

If the oscillation reduction is not effective, another mode can be activated which can specifically
compensate machine base-related oscillation.
It is recommended first to deactivate the oscillation damping of junction
APC filter for the machine base-related oscillation.
If the filters for the machine base-related oscillation are also ineffective, the causes may be:
1. The vibration does not occur in the axis direction.
2. The vibration cannot be measured on the motor.
3. The vibration is not measured with Advanced Position Control ECO.
For a machine equipped with SINUMERIK 840D sl and a second measuring system for the
axis, it is recommended to install the Advanced Position Control function module with two
encoders.
Decision-making support
When is Advanced Position Control needed with a second encoder?
● If the damping achieved by "Advanced Position Control ECO" is inadequate.
● If the motor cannot attenuate the vibration - even with a weak speed controller.
Possible reasons:
● The leadscrew pitch is too small, e.g. 5 mm
● The Gear factor motor/load revolutions is very high, e.g. p0433 ≥ 30
● The drive train has too much self-locking.
● The Tool Center Point is so far from the motor that the vibrations can only be measured by
a nearby direct measuring system.
CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA
10.8 Decision-making support for APC and APC ECO
Drive tuning
②
and to activate the
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