5.9 n: Special Adjustments
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 311
n8-48: Pull-In Current (for PM Motors)
Sets the d-axis current during no-load operation at a constant speed. Set as a percentage of the motor rated current (for
PM Motors).
• Increase this setting when hu
nting occurs or the motor speed is unstable while running at a constant speed.
• If there is too much current when driving a light load at
a constant speed, then reduce this value slightly.
Note: This parameter is available in OLV/PM.
n8-49: d-Axis Current for High Efficiency Control (for PM Motors)
Sets the d-axis current reference when running with high load at constant speed. When using an IPM motor, setting this
parameter will increase the efficiency by using the motors reluctance torque and thereby reduce the energy consumption.
This parameter should be set to 0 when using an SPM motor.
Although this setting seldom needs to be
changed, please note the following:
• If motor operation is unstable when driving heavy l
oads, try lowering this setting.
• If motor parameters (E5-) have been changed, this value will be reset to 0
and will need to be readjusted.
Note: This parameter is available in OLV/PM.
n8-51: Acceleration/Deceleration Pull-In Current (for PM Motors)
Sets the pull-in current during acceleration and deceleration as a percentage of the motor rated current (for PM Motors)
(E5-03).
Adjustments to this setting may help in
the following situations:
• Increase this setting when a large amount of
starting torque is required.
• Lower this setting if there is exc
essive current during acceleration.
Note: This parameter is available in OLV/PM.
n8-54: Voltage Error Compensation Time Constant
Sets the time constant for voltage error compensation. Make changes to this parameter under the following conditions:
• Adjust the value when hunting oc
curs at low speed.
• Increase the value in steps of 0.1 when hunting occurs with sudden load
changes. Set the value to 0 to disable the
compensation if increasing n8-54 does not help.
• Increase the value when oscillations occur at start.
Note: This parameter is available in OLV/PM.
n8-55: Load Inertia
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.
Note: This parameter is available in OLV/PM.
No. Name Setting Range Default
n8-48 Pull-In Current (for PM Motors) 20 to 200% 30%
No. Name Setting Range Default
n8-49 d Axis Current for High Efficiency Control (for PM Motors) -200.0 to 0.0% Determined by E5-01
No. Name Setting Range Default
n8-51 Acceleration/Deceleration Pull-In Current (for PM Motors) 0 to 200% 50%
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
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