72
• If an error in measurement occurs or the key has been pressed
during autotuning, an EXX error will be displayed, the motor will
coast to a stop, and autotuning will be cancelled. This error message,
however, does not remain in the error log. Refer to page 211 for
information on errors.
• If autotuning is cancelled, constants changed by autotuning will auto-
matically return to their values before the start of autotuning.
• If an error occurs while decelerating to a stop at the end of autotun-
ing, an error will be displayed on the Digital Operator, but autotuning
processing will not be cancelled. The results of autotuning will be
valid.
Precautions after Using Autotuning
For a fixed output region, the V/f pattern for the maximum point in the
output region must be set after completing autotuning. To increase the
motor’s rated speed by 1 to 1.2 times or when using a fixed output
motor, make the following changes after autotuning. Do not change
n012 (Max. Voltage) or n013 (Max. Voltage Output Frequency).
• Increasing the Motor’s Rated Speed by 1 to 1.2 Times
To increase the motor’s rated speed by 1 to 1.2 times, use the following
formula to change the setting of Max. Output Frequency (n011):
Max. output frequency = (motor rated speed) x (no. of motor poles)/120
(Hz) x 1 to 1.2)
If the motor’s speed is increased beyond the rated speed, fixed output
characteristics will be used at high speeds and motor torque will be
reduced.
• Applications to Constant Output Motors Such as Motors for
Machine Tools
Use the following formula to change the settings of n011 (Max. Output
Frequency) when using a motor with a fixed output, e.g., a motor for a
machine tool:
n011 = Frequency (Hz) at maximum speed under no-load conditions
(load rate = 0)
Do not change the motor constants after performing autotuning.
STOP
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