YASKAWA A1000 Series Technical Manual

5.9 n: Special Adjustments
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual 283
Parameter Details
5
■ n8-55: Load Inertia (OLV/PM)
Sets the ratio between motor inertia and the inertia of the connected machinery. If this value is set too low, the motor may
not start very smoothly, and the STo fault (Motor Step-Out) may occur.
For large inertia loads or to improve speed control response, increase this setting from 0. Oscillations may occur if this
value is set too high with low inertia load.
■
n8-57: High Frequency Injection (AOLV/PM)
Detects motor speed by injecting a high frequency into the motor.
Setting 0: Disabled
Disable n8-57 with SPM motors. The speed control range will be limited to approximately 1:20.
Setting 1: Enabled
Enabling n8-57 with IPM motors allows precise speed detection in a speed control range of approximately 1:100.
Note: 1. Be aware that using this function will generate some audible noise in the motor up to a certain speed.
2. Set E1-09 to 0.0 when using zero speed control.
■ n8-62: Output Voltage Limit
Sets the output voltage limit to prevent voltage saturation. Never set this value higher than the actual input voltage.
■
n8-65: Speed Feedback Detection Control Gain during ov Suppression (OLV/PM)
Sets the gain for internal speed feedback detection control when overvoltage suppression is active. Although this setting
rarely needs to be changed, adjustment may be necessary under the following conditions:
• Increase this setting if motor oscillation or hunting occurs when OV suppression is active.
• Decrease this setting in increments of 0.05 to decrease the drive responsiveness during OV suppression.
No. Name Setting Range Default
n8-54 Voltage Error Compensation Time Constant 0.00 to 10.00 1.00
No. Name Setting Range Default
n8-55 Load Inertia 0 to 3 0
No. Name Setting Range Default
n8-57 High Frequency Injection 0 or 1 0
No.
<1> Values shown here are for 200 V class drives. Double values when using a 400 V class unit.
Name Setting Range Default
n8-62 <1> Output Voltage Limit 0.0 to 230.0 Vac 200 Vac
No. Name Setting Range Default
n8-65 Speed Feedback Detection Control Gain during ov Suppression (OLV/PM) 0.00 to 10.00 1.50

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)