Yaskawa CIMR-UU2A0042A [306/644] N5 03 feed forward control gain

Yaskawa CIMR-UU4A0040A [306/644] N5 03 feed forward control gain
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:
n5-02 =
π J
Motor
n
rated
30 T
rated
Where:
J
Motor
is the motor inertia in kgm/s
2.
n
rated
is the rated speed of the motor in r/min.
T
rated
is the rated torque of the motor in N•m.
or
n5-02 =
4 π J
Motor
f
rated
p T
rated
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.
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.
Perform Auto-Tuning or manually enter the correct motor data.
4.
Properly set up the speed loop (ASR).
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.
n
n5-03: Feed Forward Control Gain
Sets the inertia ratio of the load connected to the motor. This value can be set automatically by Inertia Auto-Tuning.
No. Parameter Name Setting Range Default
n5-03 Feed Forward Control Gain 0.00 to 100.00 1.00
Set this value automatically with Inertia Auto-Tuning. If Inertia Auto Tuning cannot be performed, determine the value for
parameter n5-03 using the following steps:
1.
Select the control mode; CLV (A1-02 = 3), AOLV/PM (A1-02 = 6), or CLV/PM (A1-02 = 7).
2.
Set parameter n5-02 correctly.
3.
Couple motor and load.
4.
Set the acceleration time in C1-01 to 0.
5.
Set the torque limits in the L7-oo parameters to a value that will easily be reached during the test (T
Lim_Test
).
6.
Set the frequency reference equal to a value in the upper speed range of the machine (f
ref_Test
).
7.
While monitoring the motor speed in U1-05, start the motor in the forward direction and measure the time it takes to
reach the reference speed (t
accel
).
8.
Reverse the parameter settings above and calculate the set value for parameter n5-03 using the formula below.
n5-03 =
t
accel
T
Lim_Test
f
rated
n5-02 f
ref_Test
100
- 1
Where:
t
accel
is the measured acceleration time in s.
f
rated
is the rated frequency of the motor in Hz.
T
Lim_Test
is torque limit setting during the test (%).
f
ref_Test
is the frequency reference during the test in Hz.
5.9 n: Special Adjustments
306
YASKAWA ELECTRIC SIEP C710636 04C U1000 Industrial MATRIX Drive Technical Manual

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