N5: Inertia Compensation - YASKAWA L1000A Technical Manual

◆ n5: Inertia Compensation

Enabling Inertia Compensation improves the responsiveness of the drive to speed reference changes in applications where
a high speed control proportional gain setting (C5-01, C5-03, C5-13) would lead to problems with overshoot, undershoot,
or oscillation. Figure 5.44
function and the function principle are illustrated in
Vector Control for induction or PM motors (A1-02 = 3 or 7).
Note: Prior to using Feed Forward, always perform Auto-Tuning or set the correct motor data manually. Also perform ASR
Auto-Tuning to set the speed loop gain (C5-01, C5-03, C5-13), or adjust it manually. Fine-tune the other speed control loop
parameters (C5-) if required.
Figure 5.44
Figure 5.45
Speed
reference after
Soft Starter
Compensation
U1-01
Note: Prior to using Inertia Compensation, always perform Auto-Tuning or set the correct motor data manually. and adjust the Speed
Control Loop.
n5-01: Inertia Compensation Selection
■
Enables or disables the Inertia Compensation function.
No.
n5-01
Setting 0: Disabled
Setting 1: Enabled
n5-02: Motor Acceleration Time
■
Sets the time required to accelerate the motor from a full stop up to the rated speed at the rated torque.
No.
n5-02
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
gives an example of overshoot reduction by Inertia Compensation. Parameters related to this
Figure
1050
Overshoot
900
750
0
0 0.5 1
Time (s)
Conventional Speed Control
Figure 5.44 Overshoot Suppression by Inertia Compensation
Inertia Compensation Torque
Compensation Value
Inertia
n5-02/03
+
Speed
-
Reference
Speed
Feedback
Figure 5.45 Inertia Compensation
Parameter Name
Inertia Compensation Selection
Parameter Name
Motor Acceleration Time
5.45. Inertia Compensation can only be used in Closed Loop
Suppresses
1050
overshoot at the
end of acceleration
900
750
0
0 0.5 1
Time (s)
common_TMonly
Inertia Compensation Control
Inertia Compensation Output
U6-26
Speed Control
+
+
Loop P and I
C5-01/02/03/04
/13/14
U6-25
Speed Control Loop Output
Setting Range
Setting Range
0.001 to 10.000 s
5.9 n: Special Adjustments
common_TMonly
Speed Control
Torque reference
Loop Delay and
Torque Limits
C5-06, L7-
U1-09
Default
0 or 1
Default
Determined by o2-04
5
0
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