YASKAWA A1000 Technical Manual page 305


n3-13: Overexcitation Deceleration Gain
Multiplies a gain to the V/f pattern output value during Overexcitation Deceleration, thereby determining the level of
overexcitation. The drive returns to the normal V/f value after the motor has stopped or when it is accelerating to the
frequency reference.
No.
n3-13
The optimum setting for n3-13 depends on the motor flux saturation characteristics.
• Increase the gain gradually by 1.25 to 1.30 to improve the braking power of Overexcitation Deceleration.
• If flux saturation characteristics cause overcurrent, try lowering n3-13. A high setting sometimes causes overcurrent
(oC), motor overload (oL1), or drive overload (oL2). Lowering n3-21 can also help remedy these problems.

n3-14: High Frequency Injection during Overexcitation Deceleration
Enables High Frequency Injection while Overexcitation Deceleration is executed. Injecting high frequency into the
motor increases loss, which in turn shortens deceleration time. This function tends to increase audible noise from the
motor, and might not be desirable in environments where motor noise is a concern.
No.
n3-14
Setting 0: Disabled
Setting 1: Enabled

n3-21: High Slip Suppression Current Level
If the motor current exceeds the value set to n3-21 during Overexcitation Deceleration due to flux saturation, the drive
will automatically reduce the overexcitation gain. Parameter n3-21 is set as a percentage of the drive rated current.
This parameter should be set to a relatively low value to optimize deceleration. If overcurrent, oL1, or oL2 occur during
Overexcitation Deceleration, reduce the overslip suppression current level.
No.
n3-21

n3-23: Overexcitation Operation Selection
Limit the Overexcitation Deceleration operation selected in parameter L3-04 to forward only or reverse only.
No.
n3-23
Setting 0: Overexcitation Operation as Selected in L3-04 in Forward and Reverse Direction
Setting 1: Overexcitation Operation as Selected in L3-04 in Forward Direction Only
Setting 2: Overexcitation Operation as Selected in L3-04 in Reverse Direction Only
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Name
Overexcitation Deceleration Gain
Name
High Frequency Injection During Overexcitation Deceleration
Name
High Slip Suppression Current Level
Name
Overexcitation Operation Selection
5.9 n: Special Adjustments
Setting Range Default
1.00 to 1.40
Setting Range Default
0 or 1
Setting Range Default
0 to 150%
Setting Range Default
0 to 2
1.10
0
100%
0
5
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