2.9 L: Protection Functions
450 YASKAWA TOEPYAIGA8002B GA800 Drive Programming
Set this parameter to 0.0 to disable the function. The drive uses the acceleration time in C1-01, C1-03, C1-05, and C1-
07 to accelerate again after KEB operation completes.
■ L2-08: Frequency Gain at KEB Start
No.
(Hex.)
Name Description
Default
(Range)
L2-08
(048C)
Expert
Frequency Gain at KEB
Start
Sets the quantity of output frequency reduction used when KEB operation starts as a percentage of
the motor rated slip before starting KEB operation.
100%
(0 - 300%)
Decreases the output frequency in steps to quickly set the motor to a regenerative condition. Use this formula to
calculate the value:
Output frequency reduction = Motor rated slip before KEB operation × (L2-08/100) × 2
■ L2-09: KEB Minimum Frequency Level
No.
(Hex.)
Name Description
Default
(Range)
L2-09
(048D)
Expert
KEB Minimum Frequency
Level
Sets the quantity of output frequency reduction used as a percentage of E2-02 [Motor Rated Slip]
when KEB operation starts.
20%
(0 - 100%)
These conditions set the quantity of decrease:
• Motor rated slip × (L2-09/100)
• The larger value between the value calculated with L2-08 and the value calculated with L2-09
■ L2-10: Minimum KEB Time
No.
(Hex.)
Name Description
Default
(Range)
L2-10
(048E)
Expert
Minimum KEB Time
Sets the minimum length of time to operate the KEB after the drive detects a momentary power loss.
50 ms
(0 - 25500 ms)
When you return power while KEB is operating, the drive continues KEB operation until the time set in L2-10is
expired. When the DC bus voltage is less than the level of L2-05 [Undervoltage Detect Level (Uv1)] in one of these
conditions, KEB operation continues until the time set in L2-10 is expired:
• L2-01 = 3 [Momentary Power Loss Ope Select = KEB Mode].
• L2-01 = 4 [KEB Stop Mode]
• L2-01 = 5 [KEB Decel to Stp].
• KEB Ride-Thru 1/2 [H1-xx = 65, 66, 7A, or 7B] is input into the drive.
When you input KEB Ride-Thru, KEB operation continues after the time set in L2-10 is expired. When you cancel
KEB Ride-Thru, the motor accelerates again. When you do not input KEB Ride-Thru during the time set in L2-10, the
drive accelerates to the frequency reference that the drive had before power loss in the applicable acceleration time.
When L2-01 = 3, 4, or 5, and the DC bus voltage is a minimum of the value of L2-11 [DC Bus Vol Setpoint during
KEB], the drive accelerates again after the time set in L2-10 is expired. If the DC bus voltage is less than the L2-11
value, KEB operation continues after the time set in L2-10 is expired.
Note:
• When L2-01 = 0, 1, or 2 [Disabled, Enabled, or Enabled when CPU is Running], increase the value of L2-10. Set L2-10 to cancel KEB
operation if the KEB Ride-Thru is not input
• Set this parameter to 0 to disable the function.
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