12.2 b: APPLICATION
554 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
This is the output frequency deceleration time used by Current Detection Speed Search and by the Current
Injection Method of Speed Estimation Speed Search.
Note:
If the drive detects oL1 [Motor Overload] during Current Detection Speed Search, decrease the value set in b3-03.
■ b3-04 SpSrch V/F Gain
No.
(Hex.)
Name Description
Default
(Range)
b3-04
(0194)
SpSrch V/F Gain
Sets the ratio used to reduce the V/f during searches to reduce the output current during speed
searches.
Determined by o2-04
(10 - 100)
Use the this formula to calculate the output voltage during Speed Search:
Output voltage during Speed Search = Configured V/f × b3-04
When the current detection search operates correctly, this configuration is not necessary.
■ b3-05 SpSrch Delay Time
No.
(Hex.)
Name Description
Default
(Range)
b3-05
(0195)
SpSrch Delay Time
Sets the Speed Search delay time to activate a magnetic contactor installed between the drive and
motor.
0.2 s
(0.0 - 100.0 s)
When you use a magnetic contactor between the drive and motor, you must close the contactor before the drive
will do Speed Search. This parameter sets a delay time to activate the magnetic contactor.
■ b3-06 Speed Curr Lev1 for Estimation
No.
(Hex.)
Name Description
Default
(Range)
b3-06
(0196)
Expert
Speed Curr Lev1 for
Estimation
Sets the level of current that flows to the motor during Speed Estimation Speed Search as a
coefficient of the motor rated current. Usually it is not necessary to change this setting.
Determined by o2-04
(0.0 - 2.0)
When the speed estimation value is the minimum output frequency, increase this setting. You can do this when the
motor coasts at a high speed while the drive estimates the speed during Speed Estimation Speed Search. The limit
of the output current during speed search is automatically the drive rated current.
When the drive cannot accurately estimate the speed after you adjust this parameter, use Current Detection Speed
Search.
■ b3-07 Speed Curr Lev2 for Estimation
No.
(Hex.)
Name Description
Default
(Range)
b3-07
(0197)
Expert
Speed Curr Lev2 for
Estimation
Sets the level of current that flows to the motor during Speed Estimation Speed Search as a
coefficient of E2-03 [Mot No-Load Current] or E4-03 [M2 No-Load Current]. Usually it is not
necessary to change this setting.
1.0
(0.0 - 3.0)
During Speed Estimation Speed Searches, when the speed estimation value aligns with the minimum output
frequency, increase the setting value in 0.1-unit increments. The limit of the output current during speed search is
automatically the drive rated current.
■ b3-08 Speed ACR PGain for Estimation
No.
(Hex.)
Name Description
Default
(Range)
b3-08
(0198)
Expert
Speed ACR PGain for
Estimation
Sets the proportional gain for the automatic current regulator during Speed Estimation Speed
Search. Also adjusts speed search responsiveness. Usually it is not necessary to change this
setting.
A1-02 = 0 through 4:
Determined by o2-04
, A1-02 = 5, 6, or 8:
Determined by A1-02
(0.00 - 6.00)
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