YASKAWA GA800 Technical Reference page 741

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b3-33: Speed Search during Uv Selection
No.
Name
(Hex.)
b3-33 Speed Search during Uv
Selection
(0B3F)
Expert
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
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b3-35: Low Back EMF Detection Level
No.
Name
(Hex.)
b3-35 Low Back EMF Detection
Level
(0BC3)
Expert
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b3-36: High Back EMF Detection Level
No.
Name
(Hex.)
b3-36 High Back EMF Detection
Level
(0BC4)
Expert
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.
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b3-39: Regen Judgment Lv of Spd Search
No.
Name
(Hex.)
b3-39 Regen Judgment Lv of Spd
Search
(1B8F)
Expert
If the speed search is not completed after starting the speed search, increase the setting value in 5% increments after
the drive stops.
If the drive detects ov [Overvoltage] during speed search, decrease the setting value in 5% increments after the drive
stops.
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b3-54: Search Time
No.
Name
(Hex.)
b3-54 Search Time
(3123)
If you set this parameter too low, Speed Search will not operate correctly.
If the drive detects oC [Overcurrent] immediately after Speed Search Starts:
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
V/f CL-V/f OLV CLV AOLV
Sets the function that starts Speed Search at start-up if the drive detects a Uv [Undervoltage] when it
receives a Run command.
V/f CL-V/f OLV CLV AOLV
Sets the Low Back EMF Detection Level. Usually it is not necessary to change this setting.
V/f CL-V/f OLV CLV AOLV
Sets the voltage level for Speed Search restart. Usually it is not necessary to change this setting.
V/f CL-V/f OLV CLV AOLV
Sets the level to determine the regenerative state during speed search. Usually it is not necessary to
change this setting.
V/f CL-V/f OLV CLV AOLV
Sets the length of time that the drive will run Speed Search.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
12.3 b: Application
Default
(Range)
1
(0, 1)
Default
(Range)
10%
(5 - 50%)
Default
(Range)
0.970
(0.500 - 1.000)
Default
(Range)
15%
(0 - 50%)
Default
(Range)
400 ms
(10 - 2000 ms)
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