12.3 b: Application
662 YASKAWA SIEPC71061705H GA700 Series Technical Manual
■ 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)
■ b3-10: Speed Estimation Detection Gain
No.
(Hex.)
Name Description
Default
(Range)
b3-10
(019A)
Expert
Speed Estimation Detection
Gain
Sets the gain to correct estimated frequencies from Speed Estimation Speed Search.
1.05
(1.00 - 1.20)
If the drive detects ov [DC Bus Overvoltage] when you restart the motor, increase the setting value.
■ b3-14: Bi-directional Speed Search
No.
(Hex.)
Name Description
Default
(Range)
b3-14
(019E)
Bi-directional Speed Search
Sets the direction of Speed Search to the direction of the frequency reference or in the motor
rotation direction as detected by the drive.
Determined by A1-02, b3-
24, and E9-01
(0, 1)
Note:
• The initial value of b3-14 [Bi-directional Speed Search] is different for different A1-02 [Control Method Selection] settings when you
set these parameters: Refer to Parameters that Change from the Default Settings with A1-02 [Control Method Selection] on page 592
for information.
–A1-02 = 0, 2, 8 [V/f, OLV, EZOLV]
–E9-01 = 0 [Motor Type Selection = Induction (IM)]
–b3-24 = 1 [Speed Search Method Selection = Speed Estimation].
• The initial value of b3-14 is 0 when you set these parameters:
–A1-02 = 0, 2, 8
–E9-01 = 0
–b3-24 = 2 [Current Detection 2]
• The initial value of b3-14 is different for different A1-02 settings when you set these parameters: Refer to Parameters that Change
from the Default Settings with A1-02 [Control Method Selection] on page 592 for information.
–A1-02 = 1, 4, 8 [CL-V/f, AOLV, EZOLV]
–E9-01 = 1, 2 [Permanent Magnet (PM), Synchronous Reluctance (SynRM)]
• When you set A1-02, b3-24, and E9-01, set b3-14.
0 : Disabled
The drive uses the frequency reference to detect the direction of motor rotation.
1 : Enabled
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