11.3 b: Application
720 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
■ 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)
Set this parameter as a ratio of E2-03 [Motor No-Load Current]. Sets a current level given that E2-03 is 30% of
the motor rated current when E2-03 ≤ Motor Rated Current × 0.3.
■ b3-32: Spd Search Current Complete Lvl
No.
(Hex.)
Name Description
Default
(Range)
b3-32
(0BC1)
Expert
Spd Search Current
Complete Lvl
Sets the current level that completes Speed Search.
1.20
(0.00 - 1.49)
The Current Detection Speed Search gradually decreases the output frequency to search for the motor speed when
the output current is equal to or less than Speed Search Current Complete Level.
Set this parameter as a ratio of E2-03 [Motor No-Load Current]. Sets a current level given that E2-03 is 30% of
the motor rated current when E2-03 ≤ Motor Rated Current × 0.3.
■ b3-33: Speed Search during Uv Selection
No.
(Hex.)
Name Description
Default
(Range)
b3-33
(0B3F)
Expert
Speed Search during
Uv Selection
Sets the function that starts Speed Search at start-up if the drive detects a Uv
[Undervoltage] when it receives a Run command.
1
(0, 1)
Set these three parameters as shown to enable b3-33:
• L2-01 = 1, 2 [Power Loss Ride Through Select = Enabled for L2-02 Time, Enabled while CPU Power Active]
• b3-01 = 1 [Speed Search at Start Selection = Enabled]
• b1-03 = 1 [Stopping Method Selection = Coast to Stop]
0 : Disabled
1 : Enabled
■ b3-35: Low Back EMF Detection Level
No.
(Hex.)
Name Description
Default
(Range)
b3-35
(0BC3)
Expert
Low Back EMF
Detection Level
Sets the level of induced voltage that the drive must detect to start Speed
Search.
10%
(5 - 50%)
For example, when the induced voltage at 10% of the setting is a minimum of 20 V for 200 V class drives, the
drive will do restarts.
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