Omron SYSDRIVE 3G3RV Series User Manual page 118

n Precautions Before Using Autotuning
Read the following precautions before using autotuning.
Autotuning the Inverter is fundamentally different from autotuning the servo system. Inverter autotuning
•
automatically adjusts parameters according to detected motor constants, whereas servo system autotuning
adjusts parameters according to the detected size of the load.
When speed precision is required at high speeds (i.e., 90% of the rated speed or higher), use a motor with a
•
rated voltage that is 20 V less than the input power supply voltage of the Inverter for 200V-class Inverters
and 40 V less for 400V-class Inverters. If the rated voltage of the motor is the same as the input power sup-
ply voltage, the voltage output from the Inverter will be unstable at high speeds and sufficient performance
will not be possible.
Use stationary autotuning whenever performing autotuning for a motor that is connected to a load.
•
Use rotational autotuning whenever performing autotuning for a motor that has fixed output characteristics
•
or for a motor that is not connected to a load.
If rotational autotuning is performed for a motor connected to a load, the motor constants will not be found
•
accurately and the motor may exhibit abnormal operation. Never perform rotational autotuning for a motor
connected to a load.
• If the wiring between the Inverter and motor changes by 50 m or more between auto tuning and motor
installation, perform stationary autotuning for line-to-line resistance only.
If the motor cable is long (50 m or longer), perform stationary autotuning for line-to-line resistance only
•
even when using V/f control.
The status of the multi-function inputs and multi-function outputs will be as shown in the following table
•
during autotuning. When performing autotuning with the motor connected to a load, be sure that the hold-
ing brake is not applied during autotuning, especially for conveyor systems or similar equipment.
Tuning Mode
Rotational autotuning
Stationary autotuning
Stationary autotuning for line-
to-line resistance only
To cancel autotuning, always use the STOP Key on the Digital Operator.
•
n Precautions for Rotational and Stationary Autotuning
Use the following procedure to perform autotuning when the rated voltage of the motor is higher than the volt-
age of the power supply to the Inverter.
1. Input the voltage of the input power supply to T1-03 (Motor rated voltage).
2. Input the results of the following formula to T1-05 (Motor base frequency):
(Base frequency from the motor's nameplate × setting of T1-03)/(Rated voltage from motor's nameplate)
3. Perform autotuning.
After completing autotuning, set E1-04 (Maximum output frequency) to the base frequency from the motor's
nameplate.
IMPORTANT
-12
4
Multi-function Inputs
Do not function.
Do not function.
Do not function.
1. When speed precision is required at high speeds (i.e., 90% of the rated speed or higher), set T1-03 (Motor
rated voltage) to the input power supply voltage multipled by 0.9.
2. When operating at high speeds (i.e., 90% of the rated speed or higher), the output current will increase as
the input power supply voltage is reduced. Be sure to provide sufficient margin in the Inverter current.
Multi-function Outputs
Same as during normal
operation
Maintain same status as
when autotuning is started.
Maintain same status as
when autotuning is started.