11.10 n: Special Adjustment
998 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
• Run Auto-Tuning to set motor parameters.
When you cannot do Auto-Tuning, manually set motor parameters with the information on the motor nameplate
or test reports. Set the E2 parameters for induction motors. Set the E5 parameters for PM motors.
• Set C5 parameters [Automatic Speed Regulator (ASR)] individually to adjust the speed control loop (ASR).
• If you can connect a motor to a machine and rotate it during Auto-Tuning, do Inertia Tuning.
The drive automatically adjusts feed forward parameters during Inertia Tuning.
• If you cannot do Inertia Tuning, refer to Figure 11.149 and set the parameters related to feed forward control
individually.
■ n5-01: Feed Forward Control Selection
No.
(Hex.)
Name Description
Default
(Range)
n5-01
(05B0)
Feed Forward
Control Selection
Sets the feed forward function.
0
(0, 1)
0 : Disabled
1 : Enabled
■ n5-02: Motor Inertia Acceleration Time
No.
(Hex.)
Name Description
Default
(Range)
n5-02
(05B1)
Motor Inertia
Acceleration Time
Sets the length of time for the motor to accelerate from the stopped to the
maximum frequency with a single motor at the rated torque. Inertia Tuning
automatically sets the motor acceleration time.
Determined by C6-
01, E5-01, and o2-04
(0.001 - 10.000 s)
If you cannot do Inertia Tuning, calculate the motor acceleration time as shown here or measure the motor
acceleration time and set n5-02 to this value.
Calculate the Motor Acceleration Time
Use this formula to find the motor acceleration time:
• J
Motor
= Moment of inertia of motor (kg m
2
)
• n
rated
= Motor rated speed (min
-1
, r/min)
• T
rated
= Motor rated torque (N m)
You can also use this formula to find the motor acceleration time:
• f
rated
= Motor rated frequency (Hz)
• P = Number of motor poles
Calculate the Motor Acceleration Time
Use this procedure to calculate the motor acceleration time:
1. Use A1-02 [Control Method Selection] to set the control method.
2. Disconnect the motor and load.
3. Run Auto-Tuning to set motor parameters.
When you cannot do Auto-Tuning, manually set motor parameters with the information on the motor
nameplate or test reports. Set the E2 parameters for induction motors. Set the E5 parameters for PM motors.
4. Set C5 parameters [Automatic Speed Regulator (ASR)].
5. Set C1-01 [Acceleration Time 1] = 0.
6. Set L7-01 [Forward Torque Limit] to 100%.
7. Set the frequency reference to the same value as the motor rated speed.
8. Measure the length of time for the motor to reach the rated speed.
Show U1-05 [Motor Speed] on the keypad and enter the Run command (forward run).
9. Stop the motor.
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