B.10 n: Special Adjustment
The n parameters adjust more advanced performance characteristics such as Hunting Prevention, High Slip Braking, and
Overexcitation Braking.
u
n1: Hunting Prevention
No.
(Addr.
Hex)
Name
Description
Values
Page
n1-01
(580)
Hunting Prevention
Selection
0: Disabled
1: Enabled
Default: 1
Range: 0, 1
n1-02
(581)
Hunting Prevention Gain
Setting
If the motor vibrates while lightly loaded, increase the gain by 0.1 until
vibration ceases. If the motor stalls, decrease the gain by 0.1 until the stalling
ceases.
Default: 1.00
Min.: 0.00
Max.: 2.50
n1-03
(582)
Hunting Prevention Time
Constant
Sets the time constant used for Hunting Prevention.
Min.: 0 ms
Max.: 500 ms
n1-05
(530)
Hunting Prevention Gain
while in Reverse
Sets the gain used for Hunting Prevention. If set to 0, the gain set to n1-02 is
used for operation in reverse.
Default: 0.00
Min.: 0.00
Max.: 2.50
<1> Default setting is dependent on parameter o2-04, Drive Model Selection.
u
n3: High Slip Braking (HSB) and Overexcitation Braking
No.
(Addr.
Hex)
Name
Description
Values
Page
n3-01
(588)
High-Slip Braking
Deceleration Frequency
Width
Sets the output frequency reduction step width for when the drive stops the
motor using HSB. Set as a percentage of the maximum output frequency.
Increase this setting if overvoltage occurs during HSB.
Default: 5%
Min.: 1
Max.: 20
n3-02
(589)
High-Slip Braking Current
Limit
Sets the current limit during HSB as a percentage of the motor rated current. Default:
Min.: 100%
Max.: 200%
n3-03
(58A)
High-Slip Braking Dwell
Time at Stop
Sets the time the drive will run with minimum frequency (E1-09) at the end
of deceleration.
If this time is set too low, the machine inertia can cause the motor to rotate
slightly after HSB.
Default: 1.0 s
Min.: 0.0
Max.: 10.0
n3-04
(58B)
High-Slip Braking Overload
Time
Sets the time required for an HSB overload fault (oL7) to occur when the drive
output frequency does not change during an HSB stop. This parameter does
not typically require adjustment.
Default: 40 s
Min.: 30
Max.: 1200
n3-13
(531)
Overexcitation Deceleration
Gain
Sets the gain applied to the V/f pattern during Overexcitation Deceleration
(L3-04 = 4).
Default: 1.10
Min.: 1.00
Max.: 1.40
n3-14
(532)
High Frequency Injection
during Overexcitation
Deceleration
0: Disabled
1: Enabled
Default: 0
Range: 0, 1
n3-21
(579)
High-Slip Suppression
Current Level
Sets output current level at which the drive will start reducing the
overexcitation gain in order to prevent a too high motor slip during
Overexcitation Deceleration. Set as a percentage of the drive rated current.
Default: 100%
Min.: 0
Max.: 150
n3-23
(57B)
Overexcitation Operation
Selection
0: Enabled in both directions
1: Enabled only when rotating forward
2: Enabled only when in reverse
Default: 0
Range: 0 to 2
<1> Default setting is dependent on parameter L8-38, Frequency Reduction Selection.
B.10 n: Special Adjustment
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
469
B
Parameter List
