12.10 n: Special Adjustment
742 YASKAWA SIEPC71061753C GA500 Technical Manual
• If ov [Overvoltage] occurs, increase the deceleration time.
■ n3-14: OEB High Frequency Injection
No.
(Hex.)
Name Description
Default
(Range)
n3-14
(0532)
Expert
OEB High Frequency
Injection
Sets the function that injects harmonic signals during overexcitation deceleration.
0
(0, 1)
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.
■ n3-21: HSB Current Suppression Level
No.
(Hex.)
Name Description
Default
(Range)
n3-21
(0579)
HSB Current Suppression
Level
Sets the upper limit of the current that is suppressed at the time of overexcitation deceleration as a
percentage of the drive rated current.
100%
(0 - 150%)
If flux saturation during Overexcitation Deceleration makes the motor current become more than the value set in
n3-21, the drive will automatically decrease the overexcitation gain. If oC [Overcurrent], oL1 [Motor Overload],
or oL2 [Drive Overload] occur during overexcitation deceleration, decrease the setting value.
If repetitive or long overexcitation deceleration cause the motor to overheat, decrease the setting value.
■ n3-23: Overexcitation Braking Operation
No.
(Hex.)
Name Description
Default
(Range)
n3-23
(057B)
Overexcitation Braking
Operation
Sets the direction of motor rotation where the drive will enable overexcitation.
0
(0 - 2)
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 12.133 for more information about parameters related to feed forward control.
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.
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