Parameter Details
12
12.3 b: Application
YASKAWA SIEPC71061753C GA500 Technical Manual 519
■ b3-04: V/f Gain during Speed Search
No.
(Hex.)
Name Description
Default
(Range)
b3-04
(0194)
V/f Gain during Speed
Search
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 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: Speed Search Delay Time
No.
(Hex.)
Name Description
Default
(Range)
b3-05
(0195)
Speed Search 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 Estimation Current Level 1
No.
(Hex.)
Name Description
Default
(Range)
b3-06
(0196)
Expert
Speed Estimation Current
Level 1
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.
Note:
When the drive cannot accurately estimate the speed after you adjust this parameter, use Current Detection Speed Search.
■ b3-07: Speed Estimation Current Level 2
No.
(Hex.)
Name Description
Default
(Range)
b3-07
(0197)
Expert
Speed Estimation Current
Level 2
Sets the level of current that flows to the motor during Speed Estimation Speed Search as a
coefficient of E2-03 [Motor No-Load Current] or E4-03 [Motor 2 Rated 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 Estimation ACR P Gain
No.
(Hex.)
Name Description
Default
(Range)
b3-08
(0198)
Expert
Speed Estimation ACR P
Gain
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.
Determined by A1-02 and
o2-04
(0.00 - 6.00)
■ b3-09: Speed Estimation ACR I Time
No.
(Hex.)
Name Description
Default
(Range)
b3-09
(0199)
Expert
Speed Estimation ACR I
Time
Sets the integral time for the automatic current regulator during Speed Estimation Speed Search.
Also adjusts speed search responsiveness. Usually it is not necessary to change this setting.
Determined by A1-02
(0.0 - 1000.0 ms)
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