Autotuning - Siemens SINAMICS S120 Function Manual

4.8

Autotuning

The term "Autotuning" comprises all drive-internal functions that adapt controller parameters
during operation based on internal measured variables.
The main applications of the autotuning functions are:
● Support of the commissioning
● Adaptation of the controller during major changes in the mechanical system
The set parameters are visible in the parameters, but not saved permanently.
Overview of the most important autotuning process
Processes
Speed controller
optimization:
Automatic
controller setting
One button
tuning
Online tuning
Current setpoint
filter adaptation
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Servo Vector Explanation
control control
- X With p1960 = 3.4 the total moment of inertia is measured
and the speed controller and acceleration precontrol are
set as a result.
X - The speed controller is set automatically via the
STARTER with this process.
Filters are set automatically in the current setpoint arm
(e.g. for damping resonance) via the automatic controller
setting on the speed controller.
X - With servo control the speed and EPOS controller can be
optimized with this optimization process.
A control system is measured once and the controllers
are set as a result.
X - With this optimization process the controller parameters
are determined from the constant estimated or parame-
terized moments of inertia (motor torque and moment of
inertia).
It is recommended in all cases where EPOS is used.
Online tuning can also be set if the engineering tool (e.g.
STARTER) cannot be used upon commissioning to opti-
mize the EPOS position controller.
If the measurement/optimization is not required on a
constant basis then deactivating online tuning again once
the controller data has been calculated and then perma-
nently saving the values determined for the controller
optimization and the filter settings (RAM to ROM) is rec-
ommended.
X - The current setpoint filter adaptation is provided for sys-
tems that display a variable mechanical resonance fre-
quency during operation.
This way a selected current setpoint filter can be auto-
matically shifted to a mechanical resonance frequency.
Servo control
4.8 Autotuning
115