YASKAWA A1000 Technical Manual page 312

5.9 n: Special Adjustments
Setting 0: Below 1:10
The inertia ratio between the motor and the load is just less than 1:10.
Setting 1: Between 1:10 and 1:30
The inertia ratio between the motor and the load is between 1:10 and 1:30. Set n8-55 to 1 if an STo fault occurs as a result
of impact load or sudden acceleration/deceleration when n8-55 = 0.
Setting 2: Between 1:30 and 1:50
The inertia ratio between the motor and the load is between 1:30 and 1:50. Set n8-55 to 2 if an STo fault occurs as a result
of impact load or sudden acceleration/deceleration when n8-55 = 1.
Setting 3: Beyond 1:50
The inertia ratio between the motor and the load is higher than 1:50. Set n8-55 to 3 if an STo fault occurs as a result of
impact load or sudden acceleration/deceleration when n8-55 = 2.

n8-57: High Frequency Injection
Detects motor speed by injecting a high frequency into the motor.
Note: This parameter is available in AOLV/PM.
No.
n8-57
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 (for PM Motors)
Sets the output voltage limit to prevent voltage saturation. This parameter rarely requires adjustment. Never set this value
higher than the actual input voltage.
Note: This parameter is available in OLV/PM, AOLV/PM, or CLV/PM.
No.
n8-62
<1>
<1> Values shown here are for 200 V class drives. Double values when using a 400 V class unit.

n8-65: Speed Feedback Detection Control Gain during ov Suppression
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.
Note: This parameter is available in OLV/PM.
No.
n8-65 Speed Feedback Detection Control Gain during ov Suppression (OLV/PM)

n8-69: Speed Estimation Gain
There is normally no need to change this parameter from the default value.
Sets the proportional gain for Speed Estimation.
Note: This parameter is available in AOLV/PM.
No.
n8-69
312
Name
High Frequency Injection
Name
Output Voltage Limit (for PM Motors)
Name
Name
Speed Calculation Gain
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Setting Range
0 or 1
Setting Range
0.0 to 230.0 Vac
Setting Range
0.00 to 10.00
Setting Range
0.00 to 20.00
Default
0
Default
200 Vac
Default
1.50
Default
1.00