SYNAPTICON SOMANET OBLAC Drives Box, Commissioning And Tuning, Page: 35 / 67

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1.5.2 Auto-Tuning
The manual describes how to tune the cascaded position controller using the Auto-tuning feature.
Before conducting any of the tuning activities please check if motor is functional in torque mode and
sensor data is transmitted normally. For high-quality motor control tasks, a precise and reliable
sensor should be used. Quality of the motor position control may be insufficient with low resolution
sensors, especially if a Hall sensor is used.
The current version of the auto-tuning feature allows user to tune a BLDC motor drive. A load can be
attached to the motor. However, if the motor position has very strict limits this feature is not
recommended, because the motor may make a few full turns.
1.5.2.1 Concept of Auto-Tuning
Auto-tuning is performed in three steps:
System identification Identifying the physical properties of the object to build a mathematical
model of the target system.
Position auto-tuning Using the model to calculate controller gains that result in a specified
position control-loop performance.
Velocity auto-tuning Tuning the velocity loop with Velocity Auto-Tuning for Cyclic Synchronous
Velocity mode (CSV).
1.5.2.2 Goal of Position Auto-tuning
The Position Auto-tuning process calculates the gains for the cascaded controller automatically.
The core of the cascaded controller is linear. However, there are multiple nonlinear additions:
saturation,
feedforward terms and integrator clamping .
Commissioning and Tuning with SOMANET OBLAC Drives
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