YASKAWA GA800 Technical Reference page 973

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L2-07: Kinetic Energy Backup Accel Time
No.
Name
(Hex.)
L2-07 Kinetic Energy Backup
Accel Time
(048B)
Expert
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.
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L2-08: Frequency Gain at KEB Start
No.
Name
(Hex.)
L2-08 Frequency Gain at KEB
Start
(048C)
Expert
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
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L2-09: KEB Minimum Frequency Level
No.
Name
(Hex.)
L2-09 KEB Minimum Frequency
Level
(048D)
Expert
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
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L2-10: Minimum KEB Time
No.
Name
(Hex.)
L2-10 Minimum KEB Time
(048E)
Expert
When you return power while KEB is operating, the drive continues KEB operation until the time set in L2-10 is
expired. When the DC bus voltage is less than the level of L2-05 [Undervoltage Detection Lvl (Uv1)] in one of these
conditions, KEB operation continues until the time set in L2-10 is expired:
• L2-01 = 3 [Power Loss Ride Through Select = Kinetic Energy Backup: L2-02]
• L2-01 = 4 [Kinetic Energy Backup: CPU Power]
• L2-01 = 5 [Kinetic Energy Backup: DecelStop]
• 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 [KEB DC Bus Voltage
Setpoint], the drive accelerates again after the time set in L2-10 is expired. When the DC bus voltage is less than the
L2-11 value, KEB operation continues after the time set in L2-10 is expired.
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
V/f CL-V/f OLV CLV AOLV
Sets the acceleration time to return the frequency to the frequency reference before a power loss after
canceling KEB operation.
V/f CL-V/f OLV CLV AOLV
Sets the quantity of output frequency reduction used when KEB operation starts as a percentage of
the motor rated slip before starting KEB operation.
V/f CL-V/f OLV CLV AOLV
Sets the quantity of output frequency reduction used as a percentage of E2-02 [Motor Rated Slip]
when KEB operation starts.
V/f CL-V/f OLV CLV AOLV
Sets the minimum length of time to operate the KEB after the drive detects a momentary power loss.
12.9 L: Protection Functions
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
Default
(Range)
0.0 s
(0.0 - 6000.0 s)
Default
(Range)
100%
(0 - 300%)
Default
(Range)
20%
(0 - 100%)
Default
(Range)
50 ms
(0 - 25500 ms)
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