YASKAWA GA700 Series Technical Manual page 665

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]. The setting is a ratio with respect to 30% of the
motor rated current when E2-03 ≤ E2-01 [Motor Rated Current (FLA)] × 0.3.
Note:
When A1-02 = 8 [Control Method Selection = EZOLV], the setting is a ratio with respect to E9-06 [Motor Rated Current (FLA)] × 0.5.
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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
■
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.
■
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.
YASKAWA SIEPC71061705H GA700 Series Technical Manual
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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