4-10
4
îš„Precautions for Rotating and Non-rotating Autotuning
• If the motor rated voltage is higher than the power supply voltage, lower the base voltage value like shown
in Fig 4.3 to prevent saturation of the Inverter’s output voltage. Use the following procedure to perform
autotuning.
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):
3. Perform autotuning.
After the completing autotuning, set E1-04 (Max. output frequency) to the base frequency from the motor’s
nameplate.
Fig 4.3 Motor Base Frequency and Inverter Input Voltage Setting
•
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 × 0.9. In this case at high speeds the output current will
increase as the input power supply voltage is reduced. Be sure to provide sufficient margin in the Inverter
current.
îš„Precautions after Rotating and Non-rotating Autotuning
If the maximum output frequency and base frequency are different, set the maximum output frequency
(E1-04) after autotuning.
T1-05 Base frequency from motor nameplate
T1-03
Motor rated voltage
-----------------------------------------------
×=
0
Output frequency
Base frequency
from motor name
plate
T1-03
Rated voltage
from motor
name plate
Output voltage
Base frequency from
motor name plate
x T1-03
Rated voltage from motor
name plate
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