Basic Operation
6.3.4 Autotuning for machine tool spindle motors
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Constant setting prior to autotuning
Following constants must be set before performing autotuning.
D
Motor leak inductance (E2-06)
Set motor leak inductance using the following formula.
Setting by the motor leak inductance L (= L1 + L2)
(
E2
–
06
)
3
¯
2
Q
Rated frequency at base speed (
Hz
)
L
(
H
)
Rated current at base speed (
A
)
No–load voltage at base speed (
V
)
100
(
%
)
Note : Refer to Fig.6.11 for details of leakage inductance “L”.
Setting by the lock test values
(E2–06)
3
¯
(Vs
2
3Is
2
)
(Ps
3Is
2
)
2
¯
Rated current at base speed (A)
No–load voltage at base speed (V)
100(%)
Vs Lock test voltage V
Is
Lock test current A
Ps Lock test loss W
The result of the above formula should be from 5 to 25%. Verify the data when the obtained results are
too large (or small).
D
Carrier frequency
Set carrier frequency to 5.0 kHz.
Carrier frequency during autotuning: C8-30=1 (Carrier frequency is set to a value as set in C6-01)
Carrier frequency upper limit: C6-01=5.0 kHz
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Required Constant Settings
1.
Enter autotuning mode and make the following constant settings:
x
Rated Voltage
Set the rated voltage (VAC) at the base speed(r/min).
x
Rated Current
Set the rated current (A) at the base speed(r/min).
x
Rated Frequency
Set the rated frequency (Hz) at the base speed.
x
Rated Speed(r/min)
Set the rated speed (r/min) at the base speed.
x
Number of Poles
Set the number of poles.
x
Motor Selection
Select motor 1 or 2.
x
Number of PG pulse
Set the number PG pulse.
2.
The following message will appear when the constants have been set:
Tuning Ready?
Press RUN Key
The “Press RUN Key” message will
blink.
3.
At this point, it is still possible to change the constant settings by pressing the
Increment ( ) and Decrement ( ) Keys to display the desired constant.
4.
Press the STOP Key to cancel autotuning, and then press the MENU Key and DATA/ENTER Key.
The operation mode display will appear.
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Performing Autotuning
D
Autotuning will start if the Run Key is pressed when the “Tuning Ready?” message is being displayed.
D
The motor will operate during autotuning, so be sure that it is safe for the motor to operate before press-
ing the RUN Key.
D
The following message will be displayed when the Run Key is pressed:
Tune Proceeding
Hz
A
The “Tune Proceeding” message will blink.
D
Autotuning takes up to 1.5 minutes. The message “Tune Successful” will be displayed when autotun-
ing is completed.
D
When autotuning has been completed successfully, record the motor constants. Repeat autotuning for
three times and set to the resulting average (value).
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