Parameter Details
2
2.3 b: Application
YASKAWA TOEPYAIGA8002B GA800 Drive Programming 219
■ 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 Low Back EMF Detection Level. Usually it is not necessary to change this setting.
10%
(5 - 50%)
■ b3-36: High Back EMF Detection Level
No.
(Hex.)
Name Description
Default
(Range)
b3-36
(0BC4)
Expert
High Back EMF Detection
Level
Sets the voltage level for Speed Search restart. Usually it is not necessary to change this setting.
0.970
(0.500 - 1.000)
The drives wait for Speed Search to prevent failure when the induced voltage for the motor during coasting to a stop
is larger than the voltage the drive can output. The drive will not restart the motor (Speed Search) if induced voltage ≥
supply voltage × b3-36 after a Run command is entered. The drive will restart the motor when induced voltage <
supply voltage × b3-36. For example, if the setting value is 0.83 and the voltage does not decrease to the induced
voltage at approximately 183 V when the power supply voltage is 220 V, the drive will not restart.
■ b3-54: Search Time
No.
(Hex.)
Name Description
Default
(Range)
b3-54
(3123)
Search Time
Sets the length of time that the drive will run Speed Search.
400 ms
(10 - 2000 ms)
If you set this parameter too low, Speed Search will not operate correctly.
If the drive detects oC [Overcurrent] immediately after Speed Search Starts:
• Increase the value of L2-03 [Minimum Baseblock Time] and decrease the motor speed you use to start Speed
Search.
• Increases the setting value of b3-08 [Speed Estimation ACR P Gain].
• Increase the value of b3-54.
If the drive detects oC or ov [DC Bus Overvoltage] during Speed Search, increase the value of b3-08.
■ b3-55: Current Increment Time
No.
(Hex.)
Name Description
Default
(Range)
b3-55
(3124)
Expert
Current Increment Time
Sets the length of time that the drive will increase the current from zero current to the setting value of
b3-06 [Speed Estimation Current Level 1].
10 ms
(10 - 2000 ms)
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