Drive Tuning; Auto-Tuning - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

7.13

Drive Tuning

The following sections describe the drive tuning functions.
• Auto-tuning This section describes the auto-tuning feature provided by the control and its
use in determining motor and control parameters.
• Spinning Load This section describes the setup of the spinning load function. This feature is
used by the drive control to detect motor speed by scanning the output frequency over the
operating range of the application.
7.13.1

Auto-tuning

When operating an induction motor, the drive control is capable of performing auto-tuning. This
feature allows the drive to estimate parameters of the motor equivalent circuit. Apart from
measuring the motor equivalent circuit parameters during auto tuning, the control uses the
measured motor parameters to adjust the control loops for the best possible control bandwidth
(the bandwidth for each control loop is fixed internally in software), and hence provides good
performance in demanding applications. Such a feature provides drive tuning without the need
for an extensive adjustment procedure. Although the auto-tuning feature can be used with all
induction motors, there are some limitations. Both stages of auto-tuning can be performed with
induction motors (OLVC or CLVC).
When to use Auto-tuning
Auto-tuning is optional and is recommended only for applications in which high performance is
required.
In most general-purpose applications, such as pumps and fans, default data for the motor
equivalent circuit is sufficient and auto-tuning is not necessary.
Improper use of Stage 1 and Stage 2 auto-tuning
Improper use can lead to drive instability.
Do not use auto-tuning for standard applications. Only use auto-tuning if the application calls
for special tuning.
Never use auto-tuning as a substitute for entering known values manually.
NXGPro+ Control Manual
Operating Manual, A5E50491925A
CAUTION
Operating the Control
7.13 Drive Tuning
225