N: Special Adjustments - YASKAWA L1000A Technical Manual

5.9 n: Special Adjustments

5.9 n: Special Adjustments
These parameters handle a variety of specialized adjustments and functions, including AFR Control, resistance between
motor lines, PM motor control functions, and current detection adjustments.
◆ n1: Hunting Prevention
■ n1-08: Leakage Current Vibration Control Selection
Selects the method of Leakage-Current Vibration Control. Parameter n1-08 does not typically require adjustment from it's
default value. This parameter rarely needs to be changed.
No.
n1-08
<1>
<1> Available in drive software versions PRG: 7200 or later.
Setting 0: Method 1
Setting 1: Method 2
◆ n2: Speed Feedback Detection Control (AFR) Tuning
These parameters are used to achieve speed stability when a load is suddenly applied or removed.
Note: Properly set all motor parameters or perform Auto-Tuning before making changes to the AFR parameters.
n2-01: Speed Feedback Detection Control (AFR) Gain
■
Sets the internal speed feedback detection control gain in the AFR.
No.
n2-01
Although this parameter rarely needs to be changed, it may require adjustment in the following situations:
• If hunting occurs, increase the setting value in steps of 0.05 while checking the response.
• If response is low, decrease the setting value in steps of 0.05 while checking the response.
n2-02, n2-03: Speed Feedback Detection Control (AFR) Time Constant 1, 2
■
Parameter n2-02 sets the time constant normally used by AFR.
Parameter n2-03 sets the time constant during regenerative operation.
No.
n2-02
n2-03
Note: Setting parameter n2-02 higher than n2-03 will trigger an oPE08 error.
Although these parameters rarely need to be changed, they may require adjustment in the following situations:
• If hunting occurs, increase n2-02. If response is low, decrease it.
• Increase n2-03 if overvoltage occurs with high inertia loads at the end of acceleration or with sudden load changes.
• If setting n2-02 to a higher value, also increase C4-02 (Torque Compensation Delay Time Constant 1) proportionally.
242
Parameter Name
Leakage Current Vibration Control Selection
Parameter Name
Speed Feedback Detection Control (AFR) Gain
Parameter Name
Speed Feedback Detection Control (AFR) Time Constant 1
Speed Feedback Detection Control (AFR) Time Constant 2
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
Setting Range
0 or 1
Setting Range
0.00 to 10.00
Setting Range
0 to 2000 ms
0 to 2000 ms
Default
0
Default
1.00
Default
50 ms
750 ms