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The inertia ratio is an important parameter of the servo system, and quick commissioning can be
implemented with the correct setting of this parameter. It can be set manually or auto-tuned
automatically by the servo drive.
The servo drive supports two identification methods:
1)
Offline identification
When the offline inertia identification function is enabled in (Po008), press the keys on the
keypad of the servo drive to run the motor and obtain the inertia ratio.
2)
Online identification
The servo drive obtains the inertia ratio through load situation and writes the value to
“rotational inertia ratio (Po013)”.
CAUTION
1. If the actual inertia ratio is very large the drive gain is low, motor action will be slow, which
cannot meet the requirements for maximum motor speed and actual acceleration rate. In this
case, increase
rigidity
in
Po010
and perform inertia identification again.
2. If vibration occurs during identification, stop identification immediately and decrease the
gain.
9.2.1 Offline Identification
Servo drive can drive the load running by servo motor according to forward/reverse curve to
calculate the rotational inertia ratio of load and confirm the rotational inertia.
Confirm the following before performing offline identification:
1)
The movement travel of the motor meet the following requirements:
Ensure that the limit switches have been installed and required movement travel is reserved to
prevent overtravel which may cause accidents during identification; Ensure that the movement
travel for the motor in stop position is larger than Po015. If not, user can increase it properly.
2)
Evaluate the value of Po013
a)
Preset a large initial value for Po013.
The recommended preset value is 400. Increase Po013 gradually till the value on the keypad is
updated.
b
）
Increase the rigidity level of the servo drive properly:
Increase the rigidity level (Po010) properly to meet the requirements of inertia identification.
