No.
Name
Setting Range
Default
n8-47
Pull-In Current Compensation Time Constant (for PM Motors)
0.0 to 100.0 s
5.0 s
n
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 (E5-03).
• Increase this setting when hunting occurs or the motor speed is unstable while running at a constant speed.
• Slightly reduce this value if there is too much current when driving a light load at a constant speed.
Note:
This parameter is only available in OLV/PM.
No.
Name
Setting Range
Default
n8-48
Pull-In Current (for PM Motors)
20 to 200%
30%
n
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, this parameter
uses the reluctance torque to increase the efficiency and reduce energy consumption. Set this parameter to 0 when using an
SPM motor.
Although this setting rarely needs to be changed, adjustment may be necessary under the following conditions:
• Lower the setting if motor operation is unstable when driving heavy loads.
• If motor parameters (E5-
oo
) have been changed, this value will be reset to 0 and will require readjustment.
Note:
This parameter is only available in OLV/PM.
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
n
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 (E5-03).
Adjustment may be necessary under the following conditions:
• Increase this setting when a large amount of starting torque is required.
• Lower this setting if there is excessive current during acceleration.
Note:
This parameter is only available in OLV/PM.
No.
Name
Setting Range
Default
n8-51
Acceleration/Deceleration Pull-In Current (for PM Motors)
0 to 200%
50%
n
n8-54: Voltage Error Compensation Time Constant
Sets the time constant for voltage error compensation.
Adjustment may be necessary 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. 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 only available in OLV/PM.
No.
Name
Setting Range
Default
n8-54
Voltage Error Compensation Time Constant
0.00 to 10.00
1.00
n
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 trigger an STo (Pull-Out Detection) fault.
Increase this setting for large inertia loads or to improve speed control response. A high setting with low inertia load may
cause oscillation.
Note:
This parameter is only available in OLV/PM.
5.9 n: Special Adjustments
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
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5
Parameter Details
Summary of Contents for U1000 iQpump Drive
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