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5.9 n: Special Adjustments
324
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
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 set the correct motor data manually. Also perform ASR Auto-Tuning to
set the ASR proportional gain 1 (C5-01), or adjust it manually. Fine-tune the other ASR parameters (C5-
) if required.
3.
If not restricted by the application, use Inertia Tuning (T1-01 = 8) to have the drive automatically optimize Feed Forward parameters.
If Inertia Tuning cannot be performed, parameters related to Feed Forward should be set manually.
■
n5-01: Feed Forward Control Selection
Enables or disables the Feed Forward function.
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.
This value can be set automatically by Inertia Tuning. If Inertia Tuning cannot be performed, use one of the methods
below to determine the setting value for this parameter.
Calculation
The motor acceleration time can be calculated by,
or
Measuring Acceleration Time
Take the following steps when measuring the motor acceleration time.
1.
Select the control mode; CLV (A1-02 = 3), AOLV/PM (A1-02 = 6), or CLV/PM (A1-02 = 7).
2.
Decouple motor and load.
3.
Make sure Auto-Tuning has been performed or that the correct motor data has been entered manually.
4.
Make sure that the speed loop (ASR) has been set up properly.
5.
Set the acceleration time to zero.
6.
Set the forward torque limit in parameter L7-01 to 100%.
7.
Set the frequency reference equal to the motor rated speed.
8.
While monitoring the motor speed in U1-05, start the motor in the forward direction and measure the time it takes
to reach the rated speed.
9.
Reverse the parameter settings above and set the measured time to parameter n5-02.
■
n5-03: Feed Forward Control Gain
Parameter n5-03 sets the inertia ratio of the load connected to the motor. This value can be set automatically by Inertia
Tuning.
No.
Name
Setting Range
Default
n5-01
Feed Forward Control Selection
0 or 1
0
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
Where:
• J
Motor
is the motor inertia in kgm/s
2
.
• n
rated
is the rated speed of the motor in min
-1
• T
rated
is the rated torque of the motor in N
⋅
m.
Where:
• J
Motor
is the motor inertia in kgm
2
.
• f
rated
is the rated frequency of the motor in Hz.
• p is the number of motor poles (not pole pairs!).
• T
rated
is the rated torque of the motor in N
⋅
m.
No.
Parameter Name
Setting Range
Default
n5-03
Feed Forward Control Gain
0.00 or 100.00
1.00
n5-02 =
2
π
J
Motor
n
rated
60 T
rated
n5-02 =
4 π
J
Motor
f
rated
p T
rated
SIEP_C710636_02B_1_0.book 324 ページ 2015年11月25日 水曜日 午後4時56分