11.10 n: Special Adjustment
994 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
• First, perform Rotational Auto-Tuning.
• Operation that fluctuates around zero speed cannot be carried out when there is a load. For applications of this
sort, set A1-02 = 3 [Open Loop Vector].
• The tolerance of regenerative torque at low speeds is diminished. If regenerative torque is required in the low
speed range, set A1-02 = 3.
• This cannot be used for elevators or similar applications. There is a risk that the load could slip.
■ n4-60: Motoring Low Speed Comp Gain
No.
(Hex.)
Name Description
Default
(Range)
n4-60
(1B80)
Motoring Low Speed
Comp Gain
Sets a compensation gain to improve the control qualities for motoring loads
in the low speed range.
100.0%
(50.0 - 200.0%)
Note:
• To increase the torque precision in the motoring direction when you operate at low speeds, do Stationary Auto-Tuning for Line-to-Line
Resistance only, or increase the value of this parameter in 5% increments.
• If the output frequency changes when you operate at low speeds, do Stationary Auto-Tuning for Line-to-Line Resistance only. If it is
not better, increase this parameter in 10% increments. The recommended setting is 50% to 100%.
■ n4-61: Low Speed Comp Frequency Level
No.
(Hex.)
Name Description
Default
(Range)
n4-61
(1B81)
Low Speed Comp
Frequency Level
Sets a frequency at which the settings for n4-60 [Motoring Low Speed
Comp Gain], n4-62 [Regen Low Speed Comp Gain] are enabled. When the
output frequency < n4-61, the drive adjusts the torque to agree with the
settings for n4-60 and n4-62. Usually it is not necessary to change this
setting.
6.00 Hz
(0.50 - 12.00 Hz)
■ n4-62: Regen Low Speed Comp Gain
No.
(Hex.)
Name Description
Default
(Range)
n4-62
(1B82)
Regen Low Speed
Comp Gain
Sets a compensation gain to improve the control qualities for regenerative
loads in the low speed range.
100.0%
(50.0 - 200.0%)
Note:
If you do not apply a regenerative load when you operate at low speeds, do stationary Auto-Tuning for Line-to-Line Resistance only. If
it is not better, increase this parameter in 5% increments. The recommended setting is 100% to 150%. If you set this parameter too high,
the drive will detect CF [Control Fault] at stop.
■ n4-63: Speed EstimateResponse@High Freq
No.
(Hex.)
Name Description
Default
(Range)
n4-63
(1B83)
Speed
EstimateResponse@
High Freq
Sets the responsiveness of the speed estimation in high speed ranges, where
the output frequency is ≥ n4-67 [Estimate Gain Switchover Freq.
60.0
(0.1 - 150.0)
If better response of speed estimation is necessary, or if the motor oscillates, or if there is a large quantity of
torque ripple, increase the setting value in 10.0 unit increments. If this does not make it better, decrease the setting
value in 10.0 unit increments.
Note:
Do rotational Auto-Tuning before you adjust n4-63, n4-64 [Speed Estimate Response@Low Freq], n4-65 [Flux Estimate
Response@High Freq], and n4-66 [Flux Estimate Response @Low Freq].
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