2.9 n: Special Adjustments
YASKAWA ELECTRIC
TOEP C710687 03B FSDrive-MV1000 Parameter Guide
223
2.9 n: Special Adjustments
These parameters handle a variety of specialized adjustments and functions, including Hunting Prevention and AFR
Control functions.
u
n1: Hunting Prevention
Hunting often occurs with an output frequency below 30 Hz.
n
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 more
important than suppressing motor oscillation. This function can also be disabled without any problems in applications with high
inertia loads or relatively heavy loads.
Setting 0: Disabled
Setting 1: Enabled
n
n1-02: Hunting Prevention Gain Setting
Sets the gain for the Hunting Prevention Function.
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.
n
n1-03: Hunting Prevention Time Constant
Determines the responsiveness of the Hunting Prevention function (affects the primary delay time for Hunting
Prevention).
Normally, n1-03 does not need to be changed, but adjustment may help under the following conditions:
• Increase this value for applications with a large load inertia. A higher setting leads to slower response, though, which
can result in oscillation at lower frequencies.
• Lower this setting if oscillation occurs at low speed.
n
n1-05: Hunting Prevention Gain while in Reverse
This parameter is the same as n1-02, except that it is used when rotating in reverse. Refer to the explanation for n1-02.
Note:
When set to 0, n1-02 is enabled even when the drive is operating in reverse.
No.
Name
Setting Range
Default
n1-01
Hunting Prevention Selection
0, 1
1
No.
Name
Setting Range
Default
n1-02
Hunting Prevention Gain Setting
0.00 to 2.50
1.00
No.
<1> For details on the default settings, refer to
Defaults by Drive Model Selection (o2-04) on page 87
Name
Setting Range
Default
n1-03
Hunting Prevention Time Constant
0 to 500 ms
Determined by o2-04
No.
Name
Setting Range
Default
n1-05
Hunting Prevention Gain while in Reverse
0.00 to 2.50
0.00
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