12.9 n: SPECIAL
814 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
Figure 12.141 Suppress Overshooting with Feed Forward Control
Figure 12.142 Configure Feed Forward Control
■ Before You Use Feed Forward Control
Do one of these procedures before you use feed forward control.
• 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 parameters C5: ASR - SPEED REGULATION 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 12.142 and set the parameters related to feed forward control
individually.
■ n5-01 FF Control Selection
No.
(Hex.)
Name Description
Default
(Range)
n5-01
(05B0)
FF Control Selection
Sets the feed forward function.
0
(0, 1)
0 : Disabled
1 : Enabled
■ n5-02 Mot Inertia Acceleration Time
No.
(Hex.)
Name Description
Default
(Range)
n5-02
(05B1)
Mot 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:
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