Parameter Details
12
12.3 b: Application
YASKAWA SIEPC71061705H GA700 Series Technical Manual 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.
■ 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.
■ b3-39: Regen Judgment Lv of Spd Search
No.
(Hex.)
Name Description
Default
(Range)
b3-39
(1B8F)
Expert
Regen Judgment Lv of Spd
Search
Sets the level to determine the regenerative state during speed search. Usually it is not necessary
to change this setting.
15%
(0 - 50%)
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.
(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.
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