YASKAWA A1000 Series Technical Manual

5.9 n: Special Adjustments
278 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
■ 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.
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.
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.
■
n3-23: Overexcitation Operation Selection
Limit the Overexcitation Deceleration operation selected in parameter L3-04 to forward only or reverse only.
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
No. Name Setting Range Default
n3-13 Overexcitation Deceleration Gain 1.00 to 1.40 1.10
No. Name Setting Range Default
n3-14 High Frequency Injection During Overexcitation Deceleration 0 or 1 0
No. Name Setting Range Default
n3-21 High Slip Suppression Current Level 0 to 150% 100%
No. Name Setting Range Default
n3-23 Overexcitation Operation Selection 0 to 2 0

YASKAWA A1000 Series Specifications

General

Series	A1000
Type	AC Drive
Altitude	Up to 1000m without derating
Output Frequency	0-400 Hz
Control Method	V/f Control
Overload Capacity	150% for 60 seconds
Communication Options	Modbus, DeviceNet, Profibus, Ethernet/IP
Ambient Temperature	-10 to 50°C
Storage Temperature	-20 to 60°C
Humidity	5% to 95% (non-condensing)
Enclosure Rating	IP20
Horsepower	0.5 to 1000 HP
Power Range	0.4 - 630 kW (varies by voltage and model)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overheat
Cooling Method	Fan Cooled
Safety	Safe Torque Off (STO)