N: Special Adjustments - YASKAWA iQpump Micro CIMR-PW Series User Manual

5.9

n: Special Adjustments

The n parameters handle a variety of specialized adjustments and functions, including Hunting Prevention.
n1: Hunting Prevention
u
Hunting Prevention keeps the drive from hunting as a result of low inertia and operating with light load.
n1-01: Hunting Prevention Selection
n
Enables or disables the Hunting Prevention function.
Note: 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
n
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
n
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
n
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
n3: Overexcitation Braking
u
n3-13: Overexcitation Deceleration Gain
n
Applies a gain to the V/f pattern output value during overexcitation deceleration, thereby determining the level of
overexcitation. The drive returns to the normal V/f value after the motor has stopped or when it is accelerating to the frequency
reference.
No.
n3-13
The optimum setting for n3-13 depends on the motor flux saturation characteristics.
• Increase the gain by 1.25 to 1.30 to improve the breaking power of overexcitation.
• Reduce the value when the motor slip gets too high, which can trigger overcurrent (oC), motor overload (oL1), or drive
overload (oL2) faults. Alternatively reduce n3-21.
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
Name
Hunting Prevention Selection
Name
Hunting Prevention Gain Setting
Name
Hunting Prevention Time Constant
Name
Hunting Prevention Gain while in Reverse
Name
Overexcitation Deceleration Gain
5.9 n: Special Adjustments
Setting Range
0 or 1
Setting Range
0.00 to 2.50
Setting Range
Determined by
0 to 500 ms
Setting Range
0.00 to 2.50
Setting Range
1.00 to 1.40
Default
1
Default
1.00
Default
o2-04
Default
0.00
5
Default
1.10
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