12.9 n: SPECIAL
810 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
■ n3-21 OverExcBr Current Level
No.
(Hex.)
Name Description
Default
(Range)
n3-21
(0579)
OverExcBr Current Level
Sets the upper limit of the current that is suppressed at the time of overexcitation deceleration,
where the drive rated current = 100% value.
100%
(0 - 150%)
If flux saturation during Overexcitation Deceleration makes the motor current become more than the value set in
this parameter, the drive will automatically decrease the overexcitation gain. If oC [Overcurrent], oL1 [Motor
Overload], or oL2 [Drive Overloaded] occur during overexcitation deceleration, decrease the setting value.
If repetitive or long overexcitation deceleration cause the motor to overheat, decrease the setting value.
■ n3-23 OverExcBr Operation
No.
(Hex.)
Name Description
Default
(Range)
n3-23
(057B)
OverExcBr Operation
Sets the direction of motor rotation where the drive will enable overexcitation.
1
(1 - 3)
1 : Enabled@Both directions
2 : Enabled@FW direction
3 : Enabled@REV direction
Note:
When n3-23 = 2, 3, 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.
◆ n4: ADV. OPEN LOOP VECTOR TUNING
The following explains how to make special adjustments for Advanced Open Loop Vector [A1-02 = 4].
• 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 [CLVector].
• 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 LoSpeed Comp Gain
No.
(Hex.)
Name Description
Default
(Range)
n4-60
(1B80)
LoSpeed Comp Gain
Sets a compensation gain to improve the control qualities for motoring loads in the low speed
range.
1.000
(0.500 - 2.000)
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 LoSpeed Comp Frequency Level
No.
(Hex.)
Name Description
Default
(Range)
n4-61
(1B81)
LoSpeed Comp Frequency
Level
Sets a frequency at which the settings for n4-60 [LoSpeed Comp Gain], n4-62 [Reg LoSpd Cmp
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)
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