5.9 n: Special Adjustments
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YASKAWA ELECTRIC
SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
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n3-21: Overslip Suppression Current Level
If overcurrent, oL1, or oL2 occur during overexcitation deceleration, reduce the overslip suppression current level. Set as
a percentage of the drive rated current.
Reduce this setting if the current during overexcitation deceleration exceeds the overslip suppression current set in n3-21
as a result of flux saturation and excessive slip. Alternatively reduce the overexcitation gain n3-13.
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n3-23: Overexcitation Operation Selection
Determines which direction overexcitation can be used in. However, parameter L3-04 must be set to 4 in order for n3-23
to be enabled.
Setting 0: Enabled in Both Directions
Setting 1: Enabled in Forward Direction Only
Setting 2: Enabled in Reverse Direction Only
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n8: PM Motor Control Tuning
These parameters are available when using the special Open Loop Vector Control for permanent magnet motors and can
be used to adjust the control performance.
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n8-45: Speed Feedback Detection Control Gain (for PM OLV)
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 the drive responsiveness.
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n8-47: Pull-In Current Compensation Time Constant (for PM OLV)
Sets the time constant for making the actual current and the pull-in current agree.
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 for the pull-in current to match the target value.
• Decrease this setting if motor oscillation occurs.
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n8-48: Pull-In Current (for PM OLV)
Tells the drive the amount of d-axis current to be provided to the motor 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 reduce this level slightly.
No.
Name
Setting Range
Default
n3-21
Overslip Suppression Current Level
0 to 150%
100%
No.
Name
Setting Range
Default
n3-23
Overexcitation Operation Selection
0 to 2
0
No.
Name
Setting Range
Default
n8-45
Speed Feedback Detection Control Gain
0.00 to 10.00
0.80
No.
Name
Setting Range
Default
n8-47
Pull-In Current Compensation Time Constant
0.0 to 100.0 s
5.0 s
No.
<1> Setting range varies by the software version the drive is running. Software versions 6002 or later disable pull-in current when n8-48 = 0, and
allow the pull-in current to be changed during run.
Software versions 6002 or later: 0%, 20 to 200%
Software versions 6001 or earlier: 20 to 200%
Name
Setting Range
Default
n8-48
Pull-In Current
30%
