YASKAWA CR700

11.10 n: Special Adjustment
778 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
Figure 11.98 Setting Feed Forward Control
■ Preparation Before Executing Feed Forward Control
Perform any of the following procedures before executing feed forward control.
• Run Auto-Tuning to set motor parameters.
When Auto-Tuning cannot be performed, manually set E2 parameters using the information found on the motor
nameplate or test reports.
• Set C5 parameters [Auto Speed Regulator (ASR)] individually to adjust the speed control loop (ASR).
• Perform Inertia Tuning if a motor can be connected to a machine and rotated when running Auto-Tuning.
Parameters related to Feed Forward control are automatically adjusted when Inertia Tuning is carried out.
• If the inertia tuning process cannot be performed, refer to
Figure 11.98 and set the parameters related to Feed
Forward control individually.
■ n5-01: Feed Forward Control Selection
No.
(Hex.)
Name Description
Default
(Range)
n5-01
(05B0)
Feed Forward Control
Selection
Sets the feed forward function.
0
(0, 1)
0 : Disabled
1 : Enabled
■ n5-02: Motor Inertia Acceleration Time
No.
(Hex.)
Name Description
Default
(Range)
n5-02
(05B1)
Motor 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 o2-04
(0.001 - 10.000 s)
If Inertia Tuning process cannot be performed, calculate the motor acceleration time as illustrated below or
measure the motor acceleration time and set n5-02 to this value.
Calculate the Motor Acceleration Time
Derive the motor acceleration time using the following expression.
• J
Motor
= Moment of inertia of motor (kg m
2
)
• n
rated
= Motor rated speed (min
-1
, r/min)
• T
rated
= Motor rated torque (N∙m)
The motor acceleration time can also be derived using the following calculation expression.
• f
rated
= Motor rated frequency (Hz)
• P = Number of motor poles
V/f
CL-V/f
OLV
CLV
AOLV
V/f
CL-V/f
OLV
CLV
AOLV