T4: Automatic Retuning With Ast - Only 840D Sl; Function - Siemens SINUMERIK 840D sl Function Manual

T4: Automatic retuning with AST - only 840D sl

12.1

Function

With the "Automatic retuning with AST" function, axes with a changed mechanical system can
be retuned from the part program.
SIEMENS provides predefined cycles for the functions of the Automatic Servo Tuning (AST)
(see "Programming (Page 518)"). They can be used by machine manufacturers to create their
own tuning cycles. The machine operator must only use the machine manufacturer's cycle.
During execution, a window is displayed on the user interface displaying the progress and
results of the automatic tuning process. You can change back to the machine screen at any
time.
Application
General problem description: Dependency on the loading
With all directly driven axes, because of the widely varying loading, the current setpoint filter
must normally be adapted in order to ensure the stability of the speed control loop.
Such axes are:
● Tables with torque motors
● Linear axes with linear motors that support different masses
● Directly driven main spindles with different clamping fixtures (lathe chuck)
All conventionally driven axes (servo motor with ball screw and possibly gearbox) usually do
not require a retuning of the speed controller.
Typical applications
Typical applications are described in Section "Examples (Page 536)".
References
For information on the Automatic Servo Tuning, see:
● CNC Commissioning Manual: NC, PLC, Drive
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
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517