YASKAWA A1000 Series Technical Manual page 282

5.9 n: Special Adjustments
n8-45: Speed Feedback Detection Control Gain (OLV/PM)
■
Sets the gain for internal speed feedback detection control. 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.
• Decrease this setting in increments of 0.05 to decrease drive responsiveness.
No.
n8-45
n8-47: Pull-In Current Compensation Time Constant (OLV/PM)
■
Sets the time constant for the actual current and the pull-in current to match one another.
Although this setting rarely needs to be changed, adjustment may be necessary under the following conditions:
• Increase this setting when it takes too long for the reference value of the pull-in current to match the target value.
• Decrease this setting if motor oscillation occurs.
No.
n8-47
■ n8-48: Pull-In Current (OLV/PM)
Sets the d-axis current during no-load operation at a constant speed. Set as a percentage of the motor rated current.
• Increase this setting when hunting 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 slightly increasing this value.
No.
n8-48
n8-49: d-Axis Current for High Efficiency Control (OLV/PM)
■
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 loads, try lowering this setting.
• If motor parameters (E5-
No.
n8-49
■ n8-51: Acceleration/Deceleration Pull-In Current (OLV/PM)
Sets the pull-in current during acceleration and deceleration as a percentage of the motor rated current (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 excessive current during acceleration.
No.
n8-51
n8-54: Voltage Error Compensation Time Constant (OLV/PM)
■
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 n8-54 does not help.
• Increase the value when oscillations occur at start.
282
Name
Speed Feedback Detection Control Gain
Name
Pull-In Current Compensation Time Constant
Name
Pull-In Current
) have been changed, this value will be reset to 0 and will need to be readjusted.
Name
d Axis Current for High Efficiency Control
Name
Acceleration/Deceleration Pull-In Current
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Setting Range
0.00 to 10.00
Setting Range
0.0 to 100.0 s
Setting Range
20 to 200%
Setting Range
-200.0 to 0.0% Determined by E5-01
Setting Range
0 to 200%
Default
0.80
Default
5.0 s
Default
30%
Default
Default
50%