1.9 n: Special Adjustments
232 YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
■ n8-54: Voltage Error Compensation Time Constant (for PM OLV)
Sets the time constant for voltage error compensation. Make changes to this parameter under
the following conditions:
• Adjust the value when hunting occurs at low speed.
• Increase the value in steps of 0.1 when hunting occurs with sudden load changes. Try to
disable the compensation by setting n8-51 = 0 if increasing does not help.
• Increase the value when oscillations occur at start.
■ n8-55: Load Inertia (for PM OLV)
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 a STo fault (Motor Step-Out)
might occur.
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 a
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 a
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 a STo
fault occurs as a result of impact load or sudden acceleration/deceleration when n8-55 = 2.
■ n8-62: Output Voltage Limit (for PM OLV)
Sets the output voltage limit to prevent output voltage saturation. This value should not be
set higher than the actual input voltage.
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 Motor/Load Inertia Ratio 0 to 3 0
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