N: Special Adjustments; N: Special Adjustments; N1: Hunting Prevention; N2: Speed Feedback Detection Control (Afr) Tuning - YASKAWA T1000V Technical Manual

5.9 n: Special Adjustments

5.9

n: Special Adjustments

The n parameters handle a variety of specialized adjustments and functions, including Hunting Prevention, AFR Control,
Overexcitation Deceleration, resistance between motor lines, and PM motor control functions.

◆ n1: Hunting Prevention

Hunting Prevention keeps the drive from hunting as a result of low inertia and operating with light load. It is available in
V/f Control only.
n1-01: Hunting Prevention Selection
■
Enables or disables the Hunting Prevention function.
Note: This function is available only when using V/f Control. Hunting Prevention should be disabled when drive response is need over
suppressing motor oscillation. This function can also be disabled without any problems in applications with high inertia loads or
relatively heavy loads.
No.
n1-01
Setting 0: Disabled
Setting 1: Enabled
n1-02: Hunting Prevention Gain Setting
■
Sets the gain for the Hunting Prevention Function.
No.
n1-02
Normally, n1-02 does not need to be changed, but adjustment may help under the following conditions:
• If the motor vibrates while lightly loaded and n1-01 = 1, increase the gain by 0.1 until vibration ceases.
• If the motor stalls while n1-01 = 1, decrease the gain by 0.1 until the stalling ceases.
n1-03: Hunting Prevention Time Constant
■
Determines how responsive the Hunting Prevention function is (affects the primary delay time for Hunting Prevention).
No.
n1-03
n1-05: Hunting Prevention Gain while in Reverse
■
This parameter is the same as n1-02, except that it is used when the motor rotates in reverse. See the setting instructions
for n1-02.
Note: When set to 0 ms, n1-02 is enabled even when the drive is operating in reverse.
No.
n1-05

◆ n2: Speed Feedback Detection Control (AFR) Tuning

These parameters are used to achieve speed stability when a load is suddenly applied or removed by calculating changes
in the torque current feedback and then compensating the output frequency.
Note: Before making changes to the AFR parameters, make sure the motor parameters are set properly or perform Auto-Tuning.
n2-01: Speed Feedback Detection Control (AFR) Gain
■
Sets the internal speed feedback detection control gain in the AFR.
No.
n2-01 Speed Feedback Detection Control (AFR) Gain
206
Name
Hunting Prevention Selection
Name
Hunting Prevention Gain Setting
Name
Hunting Prevention Time Constant
Name
Hunting Prevention Gain while in Reverse
Name Setting Range
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Setting Range
0 or 1
Setting Range
0.00 to 2.50
Setting Range
0 to 500 ms
Setting Range
0.00 to 2.50
0.00 to 10.00 Determined by o2-04
Default
1
Default
1.00
Default
Determined by
o2-04
Default
0.00
Default