Measuring Frequency Responses - Siemens SINAMICS S120 Function Manual

Drive functions

Hide thumbs Also See for SINAMICS S120:

Table of Contents

Function modules

8.14 Advanced Position Control (including Active Vibration Suppression)

Measuring frequency responses

This chapter describes which measuring functions are available to measure the relevant

frequency responses, and how these can be executed.

Are you As APC has its own control loop, it is always recommended, when starting

optimization, to measure the open circuit once with a high bandwidth (e.g. 4000 Hz for a

speed controller clock cycle of 125 µs). This measurement can be used as basis to derive

whether and which filtering is required to stabilize the control loop. This is especially

important for APC using a direct measuring system.

However, to optimize APC further it is better to perform the measurements with a lower

bandwidth (e.g. 400 Hz - the lower the oscillation frequency, the lower the measurement

bandwidth), as the frequency resolution of the measurement increases.

Use case SINUMERIK

There are several predefined measurement functions in HMI Operate to measure APC

control loops. Measurement functions "APC open circuit" and "APC closed circuit" are

available in the menu "Commissioning > Optimization/test > Speed control loop".

These measurement functions are only displayed if a value > 0 is entered in the parameter

p3761! When activated for the first time, APC should still be inactive (p3700.0 = 0).

The encoder combination function can be measured using predefined measurement

functions "Speed-controlled system", "Open speed control loop" or "Speed controller

reference frequency response". The differential position feedback function can be measured

using "Open speed control loop" or "Speed controller reference frequency response".

All APC functions can be measured at the reference frequency response of the position

control loop (in menu "Commissioning > Optimization/test > Position control loop" select

measurement "Position controller reference frequency response").

Function Manual, 11/2017, 6SL3097-4AB00-0BP5

Drive functions

Show Quick Links

Table of Contents