YASKAWA AC Drive-A1000 Technical Manual page 273

Frequency
reference after
Soft Starter
U1-20
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.
n5-01
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.
n5-02
Set this value automatically with Inertia Auto-Tuning. If Inertia Auto-Tuning cannot be performed, use one of the following
methods to determine the setting value for this parameter.
Calculation
The motor acceleration time can be calculated by one of the following formulas:
π J
n
Motor rated
n5-02 =
30 T
rated
or
4 π J
f
Motor rated
n5-02 =
p T
rated
Measuring Acceleration Time
Take the following steps when measuring the motor acceleration time:
1.
Decouple motor and load.
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
Feed Forward Torque
Compensation Value
Feed Forward
Control
n5-02/03
+
Frequency
-
Reference
Speed
Feedback
Figure 5.106 Feed Forward Control
Name
Feed Forward Control Selection
Parameter Name
Motor Acceleration Time
Where:
• J
is the motor inertia in kgm/s
Motor
• n is the rated speed of the motor in r/min
rated
• T is the rated torque of the motor in N•m.
rated
Where:
• J
is the motor inertia in kgm/s
Motor
• f is the rated frequency of the motor in Hz.
rated
• p is the number of motor poles (not pole pairs).
• T is the rated torque of the motor in N•m.
rated
Feed Forward Output
U6-26
+ +
ASR P and I
C5-01/02/03/04
U6-25
ASR Output
Setting Range
Setting Range
0.001 to 10.000 s
2.
2
.
5.9 n: Special Adjustments
ASR Delay and Torque reference
Torque Limits
C5-06, L7-oo
U1-09
Default
0, 1
Default
Determined by
C6-01, E5-01 and
o2-04
0
5
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