6 Basic Parameter Settings
6 - 14
High-function General-purpose Inverter RX2 Series User’s Manual
The auto-tuning is a function that measures and automatically sets the motor constants necessary for
the motor control.
There are two types of auto-tuning functions: Offline auto-tuning where the auto-tuning function finishes
after a single measurement and online auto-tuning where the auto-tuning function measures a change
in the constants due to motor temperature increase every time the motor is started or stopped.
Use the offline auto-tuning to measure the motor constants if you use a motor whose constants are
unknown.
The online auto-tuning can stabilize the motor behavior by correcting the temperature increase of the
motor during operation.
Precautions for Correct Use
• When 02 (revolving) is chosen in the auto-tuning selection [HA-01], the motor automatically
begins rotating when the tuning starts.
Make sure of the followings.
• No problem shall occur even with the rotation at a frequency close to 80% of the base fre-
quency.
• The motor shall not be driven from external.
• The braking shall be in the open state.
• The torque is not high enough during the auto-tuning. Lift or other machine could have unex-
pected slipping. Remove the motor from the loading machine and perform the auto-tuning to
the independent motor. (In this case, the moment of inertia J is that of the independent motor
and hence the moment of inertia of the loading machine should be converted to the value
about the motor axis and added to J.)
• For a machine with limited motor axis rotation (lift, ball screw, etc.), 01 (non-revolving) should
be chosen in [HA-01] since rotation higher than the allowed one could occur causing a dam-
age to the machine.
6-2-3 Auto-tuning of Motor
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