12.3 b: Application
738 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
■ b3-09: Speed Estimation ACR I Time
No.
(Hex.)
Name Description
Default
(Range)
b3-09
(0199)
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 when
A1-02 ≠ 5
20.0 when A1-02 = 5
(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 662 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 662 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
The drive detects the direction of motor rotation during Speed Search.
■ b3-17: Speed Est Retry Current Level
No.
(Hex.)
Name Description
Default
(Range)
b3-17
(01F0)
Expert
Speed Est Retry Current
Level
Sets the current level for the search retry function in Speed Estimation Speed Search as a percentage
where drive rated current is a setting value of 100%.
150%
(0 - 200%)
When a large quantity of current flows during Speed Estimation Speed Search, the drive temporarily stops operation
to prevent overvoltage and overcurrent. When the current is at the level set in b3-17, the drive tries speed search
again.
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