12.9 n: SPECIAL
812 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
■ n4-67 SpEstim Gain SwFrequency
No.
(Hex.)
Name Description
Default
(Range)
n4-67
(1B87)
SpEstim Gain SwFrequency
Sets the switching frequency for estimation gain for these parameters:
n4-63 [HF SpdEstim Response]
n4-64 [LF SpdEstim Response]
n4-65 [HF FlxEstim Response]
n4-66 [LF FlxEstim Response]
6.00 Hz
(0.00 - E1-04)
If the output frequency > n4-67, the drive will select n4-63 and n4-65. If the output frequency < n4-67, the drive
will select n4-64 and n4-66.
■ n4-68 SpEstim Filter Time Constant
No.
(Hex.)
Name Description
Default
(Range)
n4-68
(1B88)
SpEstim Filter Time
Constant
Sets the primary delay time constant for the speed estimation value. Usually it is not necessary to
change this setting.
1 ms
(1 - 10 ms)
If the motor speed oscillates in the high speed range, set the value to 0.010 s.
■ n4-69 Flux Control Response
No.
(Hex.)
Name Description
Default
(Range)
n4-69
(1B89)
Flux Control Response
Unifies control of magnetic flux to make motor vibrations more stable.
1.00
(0.00 - 60.00)
If step-out occurs when the load changes, decrease the setting value in 1.00 increments.
Note:
If heavy loads decrease motor speed, increase the setting value in 1.00 increments. If it does not get better, increase n4-74 [Flux Control
Limit] in 20% increments.
■ n4-70 Speed Comp@LowFrequency
No.
(Hex.)
Name Description
Default
(Range)
n4-70
(1B8A)
Speed
Comp@LowFrequency
Sets the function to make the drive more stable when operating at low speeds. Usually it is not
necessary to change this setting.
0.60 Hz
(0.00 - 1.50 Hz)
This function makes the control more stable when operating at low speeds. Increase the setting in 0.3 Hz
increments at the time of low-speed references with no load.
Note:
If you increase this parameter to make the speed references for low speeds more stable, it can make the speed control less accurate.
■ n4-71 Flux Detect Method
No.
(Hex.)
Name Description
Default
(Range)
n4-71
(1B8B)
Flux Detect Method
Chooses the method of estimating the magnetic flux.
1
(1, 2)
1 : Method 1
Estimates magnetic flux by voltage command.
2 : Method 2
Estimates magnetic flux by voltage detection.
■ n4-72 Spd Fbk Mode
No.
(Hex.)
Name Description
Default
(Range)
n4-72
(1B8C)
Spd Fbk Mode
Sets the requirement for an encoder option when A1-02 = 4 [Control Method = Adv OLVector].
1
(1, 2)
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