N4: Adv Open Loop Vector Tune - YASKAWA GA800 Technical Reference

0 : Disabled
1 : Enabled Only when Rotating FWD
2 : Enabled Only when Rotating REV
Note:
When n3-23 = 1, 2, the drive enables overexcitation only in the direction of motor rotation in which a regenerative load is applied. Increased
motor loss can decrease ov [Overvoltage] faults.
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n4: Adv Open Loop Vector Tune

To make special adjustments for Advanced Open Loop [A1-02 = 4] (AOLV) control, note these items:
• Do Rotational Auto-Tuning first.
• When there is a load, applications must stay constant around zero speed in AOLV control. If the application will not
stay constant around zero speed, set A1-02 = 3 [Closed Loop Vector].
• The tolerance of regenerative torque at low speeds decreases in AOLV control. When regenerative torque is
necessary in the low speed range, set A1-02 = 3.
• If you operate the drive at a frequency lower than n4-70 [Speed Command Comp @ Low Freq] (default setting:
1.00 Hz), the motor can rotate at a frequency that is approximately 1/2 of the n4-70 setting. Set E1-09 [Minimum
Output Frequency] > 0 to not let the motor to rotate at a lower frequency than the n4-70 setting. When the
frequency reference ≤ E1-09, the drive output will turn OFF.
■
n4-60: Motoring Low Speed Comp Gain
No.
Name
(Hex.)
n4-60 Motoring Low Speed Comp
Gain
(1B80)
Note:
• To improve torque accuracy in the motoring direction when running at low speeds, either perform only Stationary Auto-Tuning for Line-to-
Line Resistance, or increase the setting value in 5% increments. The recommended setting is 100% to 120%.
• 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.
Name
(Hex.)
n4-61 Low Speed Comp Frequency
Level
(1B81)
■
n4-62: Regen Low Speed Comp Gain
No.
Name
(Hex.)
n4-62 Regen Low Speed Comp
Gain
(1B82)
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 this
does not make it better, increase the setting value 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.
Name
(Hex.)
n4-63 Speed
EstimateResponse@High
(1B83)
Freq
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
V/f CL-V/f OLV CLV AOLV
Sets a compensation gain to improve the control qualities for motoring loads in the low speed range.
V/f CL-V/f OLV CLV AOLV
Sets a frequency at which the settings n4-60 [Motoring Low Speed Comp Gain] and 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.
V/f CL-V/f OLV CLV AOLV
Sets a compensation gain to improve the control qualities for regenerative loads in the low speed
range.
V/f CL-V/f OLV CLV AOLV
Sets the responsiveness of the speed estimation in high speed ranges, where the output frequency is ≥
n4-67 [Estimate Gain Switchover Freq].
12.10 n: Special Adjustment
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
100.0%
(50.0 - 200.0%)
Default
(Range)
6.00 Hz
(0.50 - 12.00 Hz)
Default
(Range)
100.0 %
(50.0 - 500.0%)
Default
(Range)
60.0
(0.1 - 300.0)
12
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