YASKAWA OYMC V1000, Programming Manual

Page: 229 / 408

1.9 n: Special Adjustments
YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual 229
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n3-13: Overexcitation Deceleration Gain
Applies 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 reaccelerating back up to frequency reference.
The optimum setting for n3-13 depends on the motor flux saturation characteristics.
• Increase the gain by 1.25 to 1.30 to improve the breaking power of overexcitation.
• Reduce the value when the motor slip gets too high, which can trigger overcurrent (oC),
motor overload (oL1), or drive overload (oL2) faults. Alternatively reduce n3-21.
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n3-21: High Slip Suppression Current Level
If overcurrent, oL1, or oL2 occur during overexcitation deceleration, reduce the overslip
suppression current level. Set as a percentage of the drive rated current.
Reduce this setting if the current during overexcitation deceleration exceeds the overslip
suppression current set in n3-21 as a result of flux saturation and excessive slip.
Alternatively reduce the overexcitation gain n3-13.
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n3-23: Overexcitation Operation Selection
Determines which direction overexcitation can be used in. However, parameter L3-04 must
be set to 4 in order for n3-23 to be enabled.
No. Name Setting Range Default
n3-04 High Slip Braking Overload Time 30 to 1200 s 40 s
No. Name Setting Range Default
n3-13 Overexcitation Deceleration Gain 1.00 to 1.40 1.10
No. Name Setting Range Default
n3-21 Overslip Suppression Current Level 0 to 150% 100%
No. Name Setting Range Default
n3-23 Overexcitation Operation Selection 0 to 2 0