12.3 b: Application
520 YASKAWA SIEPC71061753C GA500 Technical Manual
■ 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 and
b3-24
(0, 1)
Note:
• When E9-01 = 0 [Motor Type Selection = Induction (IM)] and A1-02 = 0, 2, or 8 [Control Method Selection = V/f, OLV, or EZOLV],
the default settings change when the setting of b3-24 [Speed Search Method Selection] changes.
–b3-24 = 1 [Speed Estimation]: Refer to Parameters that Change from the Default Settings with A1-02 [Control Method Selection] on
page 460.
–b3-24 = 2 [Current Detection 2]: 0
• When E9-01 = 1 or 2 [Permanent Magnet (PM), Synchronous Reluctance (SynRM)] and A1-02 = 0 or 8 [V/f, EZOLV], refer to
Parameters that Change from the Default Settings with A1-02 [Control Method Selection] on page 460.
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.
■ b3-18: Speed Est Retry Detection Time
No.
(Hex.)
Name Description
Default
(Range)
b3-18
(01F1)
Expert
Speed Est Retry Detection
Time
Sets the length of time that the drive will wait to retry Speed Estimation Speed Search when too
much current flow stopped the Speed Search.
0.10 s
(0.00 - 1.00 s)
When the current is more than the level set in b3-17 [Speed Est Retry Current Level] during the time set in b3-18,
the drive tries speed search again.
■ b3-19: Speed Search Restart Attempts
No.
(Hex.)
Name Description
Default
(Range)
b3-19
(01F2)
Speed Search Restart
Attempts
Sets the number of times to restart Speed Search if Speed Search does not complete.
3 times
(0 - 10 times)
If the drive does the number of Speed Search restarts set in this parameter, it will trigger an SEr [Speed Search
Retries Exceeded] error.
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