Parameter Details
12
12.3 b: Application
YASKAWA SIEPC71061753C GA500 Technical Manual 521
■ b3-24: Speed Search Method Selection
No.
(Hex.)
Name Description
Default
(Range)
b3-24
(01C0)
Speed Search Method
Selection
Sets the Speed Search method when you start the motor or when you restore power after a
momentary power loss.
2
(1, 2)
Note:
• When A1-02 = 8 [Control Method Selection = EZOLV], the default setting changes when the setting for E9-01 [Motor Type Selection]
and the drive model change.
–E9-01 = 0 [Induction (IM)]
–E9-01 = 1, 2 [Permanent Magnet (PM), Synchronous Reluctance (SynRM)]: 1
• When you set A1-02 = 8 and E9-01 = 1 or 2, set b3-24 = 1. If b3-24 = 2, the drive will detect oPE08 [Parameter Selection Error].
• When you set b3-24, it will trigger the drive to initialize b3-14 [Bi-directional Speed Search]. After you set b3-24, set b3-14.
Set b3-01 = 1 [Speed Search at Start Selection = Enabled] to do Speed Search at start. Set L2-01 = 1 [Power
Loss Ride Through Select = Enabled for L2-02 Time]] to do Speed Search after you restore power after a
momentary power loss.
1 : Speed Estimation
The drive uses the residual voltage from a short baseblock time to estimate the motor speed.
If there is not sufficient residual voltage, then the drive will inject DC current into the motor to estimate the motor
speed.
2 : Current Detection 2
The drive will inject DC current into the motor to estimate motor speed.
■ b3-25: Speed Search Wait Time
No.
(Hex.)
Name Description
Default
(Range)
b3-25
(01C8)
Expert
Speed Search Wait Time
Sets the length of time the drive will wait to start the Speed Search Retry function.
0.5 s
(0.0 - 30.0 s)
If the drive detects these faults during speed search, increase the setting value:
• oC [Overcurrent]
• ov [Overvoltage]
• SEr [Speed Search Retries Exceeded]
■ b3-26: Direction Determination Level
No.
(Hex.)
Name Description
Default
(Range)
b3-26
(01C7)
Expert
Direction Determination
Level
Sets the level to find the motor rotation direction. Increase the value if the drive cannot find the
direction.
1000
(40 to 60000)
■ b3-29: Speed Search Back-EMF Threshold
No.
(Hex.)
Name Description
Default
(Range)
b3-29
(077C)
Expert
Speed Search Back-EMF
Threshold
Sets the induced voltage for motors that use Speed Search. The drive will start Speed Search
when the motor induced voltage level is the same as the setting value. Usually it is not necessary
to change this setting.
10%
(0 - 10%)
To make adjustments, gradually decrease the setting value. If you decrease the setting value too much, speed
search will not operate correctly.
■ b3-31: Spd Search Current Reference Lvl
No.
(Hex.)
Name Description
Default
(Range)
b3-31
(0BC0)
Expert
Spd Search Current
Reference Lvl
Sets the current level that decreases the output current during Current Detection Speed Search.
1.50
(1.50 - 3.50)
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