Yaskawa CIMR-UU4A0216F [305/644] N5 feed forward control

Yaskawa CIMR-UU4A0065F [305/644] N5 feed forward control
Lower n3-13 when flux saturation characteristics cause overcurrent. A high setting sometimes causes overcurrent (oC),
motor overload (oL1), or drive overload (oL2).
u
n5: Feed Forward Control
Enabling Feed Forward improves the responsiveness of the drive to speed reference changes in applications where a high
speed control proportional gain setting (ASR gain, C5-01, C5-03) would lead to problems with overshoot, undershoot, or
oscillation. Figure 5.103 gives an example of overshoot reduction by Feed Forward. Parameters related to this function and
the function principle are illustrated in Figure 5.104. Feed Forward can only be used in CLV, CLV/PM, or AOLV/PM (A1-02
= 4, 6, or 7).
1050
Overshoot
Conventional Speed Control Feed Forward Control
Time (s)
Motor Speed (r/min)
Motor Speed (r/min)
Time (s)
900
750
0
1050
900
750
0
0 0.5 1 0 0.5 1
Suppresses
overshoot at the
end of acceleration
Figure 5.103 Overshoot Suppression by Feed Forward Control
ASR P and I
C5-01/02/03/04
Feed Forward
Control
n5-02/03
Frequency
reference after
Soft Starter
ASR Delay and
Torque Limits
C5-06, L7-oo
+
+
+
-
Speed
Feedback
U6-26
U6-25
U1-20
Feed Forward Output
ASR Output
U1-09
Frequency
Reference
Feed Forward
Torque
Compensation Value
T
orque reference
Figure 5.104 Feed Forward Control
Note: 1. Feed Forward can only be used in CLV, AOLV/PM, and CLV/PM control modes.
2. Prior to using Feed Forward, always perform Auto-Tuning or manually enter the correct motor data. Perform ASR Auto-Tuning to set
the speed loop gain (C5-01), or adjust it manually. Fine-tune the other speed control loop parameters (C5-oo) if required.
3. If not restricted by the application, use Inertia Auto Tuning (T1-01 = 8) to automatically optimize Feed Forward parameters. If Inertia
Auto Tuning cannot be performed, manually set parameters related to Feed Forward.
n
n5-01: Feed Forward Control Selection
Enables and disables the Feed Forward function.
No. Name Setting Range Default
n5-01 Feed Forward Control Selection 0, 1 0
Setting 0: Disabled
Setting 1: Enabled
n
n5-02: Motor Acceleration Time
Sets the time required to accelerate the motor from a full stop to the rated speed at the rated torque.
No. Parameter Name Setting Range Default
n5-02 Motor Acceleration Time 0.001 to 10.000 s
Determined by
C6-01, E5-01 and
o2-04
5.9 n: Special Adjustments
YASKAWA ELECTRIC SIEP C710636 04C U1000 Industrial MATRIX Drive Technical Manual
305
5
Parameter Details

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