Yaskawa Z1000 AC Drive HVAC - Manual (Page 296)

B.9 n: Special Adjustment
The n parameters adjust more advanced performance characteristics such as Hunting Prevention, speed feedback detection,
High Slip Braking, and Online Tuning for motor line-to-line resistance.
u n1: Hunting Prevention
No.
(Addr.
Hex)
Name LCD Display Description Values Page
n1-01
(580)
Hunting Prevention
Selection
Hunt Prev Select
0: Disabled
1: Enabled
0: Disabled
1: Enabled
Default: 1
Range: 0, 1
–
n1-02
(581)
Hunting Prevention
Gain Setting
Hunt Prev Gain
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
Hunt Prev Time
Sets the time constant used for Hunting Prevention. Default: <1>
Min.: 0 ms
Max.: 500 ms
–
n1-05
(530)
Hunting Prevention
Gain while in Reverse
Hprev Gain @Rev
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 LCD Display Description Values Page
n3-01
(588)
High-Slip Braking
Deceleration Frequency
Width
HSB DecStepWidth
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
HSB Current Lim
Sets the current limit during HSB as a percentage of the motor
rated current.
Default: <1>
Min.: 0%
Max.: 200%
–
n3-03
(58A)
High-Slip Braking
Dwell Time at Stop
HSB DwelTim@Stp
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
HSB OL 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
Hflux Brake 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
–
n3-21
(579)
High-Slip Suppression
Current Level
Hflux I Supp Lvl
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
Hflux Brake Sel
0: Enabled-Both Dir
1: Enabled-Fwd only
2: Enabled-Rev only
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.9 n: Special Adjustment
296 YASKAWA ELECTRIC TOEP YAIZ1U 03A YASKAWA AC Drive – Z1000 User Manual