N5: Feed Forward Control - YASKAWA CIPR-GA50C series Technical Manual

• If ov [Overvoltage] occurs, increase the deceleration time.
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n3-14: OEB High Frequency Injection
No.
Name
(Hex.)
n3-14 OEB High Frequency
Injection
(0532)
Expert
Enable this parameter to set a shorter deceleration time.
Note:
• If you frequently use overexcitation deceleration on a motor, the motor loss will increase the risk of burn damage.
• When you set this parameter to 1, the motor can make a loud excitation sound during overexcitation deceleration. If the excitation
sound is unwanted, set this parameter to 0 to disable the function.
0 : Disabled
1 : Enabled
The drive injects harmonic signals at the time of overexcitation deceleration. You can decrease the deceleration
time because motor loss increases.
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n3-21: HSB Current Suppression Level
No.
Name
(Hex.)
n3-21 HSB Current Suppression
Level
(0579)
If flux saturation during Overexcitation Deceleration makes the motor current become more than the value set in
this parameter, the drive will automatically decrease the overexcitation gain. If oC [Overcurrent], oL1 [Motor
Overload], or oL2 [Drive Overloaded] occur during overexcitation deceleration, decrease the setting value.
If repetitive or long overexcitation deceleration cause the motor to overheat, decrease the setting value.
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n3-23: Overexcitation Braking Operation
No.
Name
(Hex.)
n3-23 Overexcitation Braking
Operation
(057B)
0 : Disabled
1 : Enabled Only when Rotating FWD
2 : Enabled Only when Rotating REV
Note:
When n3-23 = 1, 2, the drive enables overexcitation only in the direction of motor rotation in which a regenerative load is applied.
Increased motor loss can decrease ov [Overvoltage] faults.
◆

n5: Feed Forward Control

Feed forward control increases the responsiveness of acceleration and deceleration as specified by the speed
reference.
Increase the values set in C5-01 and C5-03 [ASR Proportional Gain] to apply feed forward control to machines
that have low rigidity and are possible to have hunting and vibration or to machines that have a large quantity of
inertia. Refer to Figure 12.130
Set A1-02 = 6 [Control Method Selection = Advanced Open Loop Vector Control for PM] to enable feed forward
control.
Note:
• You cannot use feed forward control to increase responsiveness in applications where you apply loads externally during run at constant
speed.
• You cannot use feed forward control with motor 2.
YASKAWA SIEPC71061753A GA500 Technical Manual
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the function that injects harmonic signals during overexcitation deceleration.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the upper limit of the current that is suppressed at the time of overexcitation deceleration as a
percentage of the drive rated current.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the direction of motor rotation where the drive will enable overexcitation.
for more information about parameters related to feed forward control.
12.10 n: Special Adjustment
Description
Description
Description
Default
(Range)
0
(0, 1)
Default
(Range)
100%
(0 - 150%)
Default
(Range)
0
(0 - 2)
12
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