YASKAWA CIMR-ZU A Series Programming Manual page 129

n8 Load Inertia (OL /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 trigger an STo (Motor Step-Out) fault.
Increase this setting for large inertia loads or to improve speed control response. A high setting with low inertia load may
cause oscillation.
No
n8-55
Settin Belo 1 1
The inertia ratio between the motor and the load is lower than 1:10.
Settin 1 Bet een 1 1 and 1
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.
Settin 2 Bet een 1 and 1
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.
Settin Beyond 1
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 2 Output olta e Limit
Sets the output voltage limit to prevent voltage saturation. Do not set this value higher than the actual input voltage.
No
n8-62
<1> Values shown are specific to 200 V class drives. Double value for 400 V class drives.
n8 Speed Feedbac Detection Control Gain durin o Suppression (OL /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
Speed Feedback Detection Control Gain during ov Suppression
n8-65
Name
Load Inertia
Name
Output Voltage Limit
Name
(OLV/PM)
1 n Special Ad ustments
Settin an e
0 to 3
Settin an e
0.0 to 230.0 Vac
<1>
Settin an e
0.00 to 10.00
De ault
0
De ault
200 Vac
<1>
De ault
1.50
1
12