Yaskawa F7 Drive Programming Manual - Manual (Page 25)

Programming 17
b3-02 Speed Search Deactivation Current
Setting Range: 0 to 200% of Drive rated output current
Factory Default: 120% of Drive rated output current
When using the current detection method of Speed Search (b3-01 = 2 or 3), parameter b3-02 sets the current level that will
determine when the search is complete and the rotor and output speeds match. When the output frequency is higher than the
actual rotor speed the slip causes the current to be high. As the output frequency is lowered, the closer it comes to the rotor
speed, the lower the current draw will be. When the output current drops below the level as set in b3-02 (100% = Drive Rated
Current) the output frequency stops decreasing and normal operation resumes.
Note: When parameter A1-02 = 0 (V/f control without PG) the factory default setting is 120. When parameter A1-02 = 2 (Open
Loop Vector) the factory default setting is 100.
b3-03 Speed Search Deceleration Time
Setting Range: 0.1 to 10.0 Seconds
Factory Default: 2.0 Seconds
Parameter b3-03 sets the deceleration ramp used by the current detection method of Speed Search (b3-01 = 2 or 3) when
searching for the motor’s rotor speed. Even if Speed Search 2 is selected, for Speed Search at start, the time entered into b3-03
will be the time to decelerate from maximum frequency (E1-04) to minimum frequency (E1-09).
b3-05 Speed Search Delay Time
Setting Range: 0.0 to 20.0 Seconds
Factory Default: 0.2 Seconds
In cases where an output contactor is used between the Drive and the motor, extra waiting time is provided after power returns
and before Speed Search is performed. This extra time allows for the contactor to operate. When Speed Search at start is used,
b3-05 will serve as the lower limit of the Minimum Baseblock Time (L2-03).
b3-10 Speed Search Detection Compensation Gain
Setting Range: 1.00 to 1.20
Factory Default: 1.10
This parameter sets the gain for the frequency reference at which the Drive starts speed estimation speed search. It is used only
when b3-01 = 0 or 1.
b3-14 Bi-Directional Speed Search Selection
The b3-14 parameter can be used to turn off the bi-directional capabilities of the Speed Estimation form of Speed Search. By
turning off the bi-directional capability, the speed search will only try to match the speed in the last known direction.
Setting Description
0 Disabled
1 Enabled (factory default)