YASKAWA GA700 Technical Manual page 841

• L2-06 = 0
Parameter C1-09 [Fast Stop Time] is automatically reduced to the base value so that the DC bus voltage does
not fall below the low voltage detection level. The setting of L2-02 [Momentary Power Loss Ride-Thru Time] is
ignored in this case.
• L2-06 ≠ 0
As illustrated in the following figure, the frequency reference decelerates until it reaches the KEB frequency
level in accordance with the deceleration rate of L2-06 and then returns to the original frequency reference in
accordance with C1-01 [Acceleration Time 1]. The KEB frequency level is determined by the setting value of
the KEB frequency rate as per the following expression.
KEB frequency level = Output frequency before power loss × (1 - (L2-02) / (L2-06))
■
L2-07: KEB Acceleration Time
No.
Name
(Hex.)
L2-07 KEB Acceleration
Time
(048B)
Setting L2-07 to 0.00 seconds disables the function. The currently valid acceleration time [C1-01, C1-03, C1-05,
and C1-07] is used for reacceleration after KEB operation completes.
■
L2-08: Frequency Gain at KEB Start
No.
Name
(Hex.)
L2-08 Frequency Gain at
KEB Start
(048C)
Reduces the output frequency in steps to quickly set the motor to a regenerative state. Calculate the value using
the following expression.
Output frequency reduction = Motor rated slip before KEB operation × (L2-08/100 ) × 2
■
L2-09: KEB Minimum Freqency Level
No.
Name
(Hex.)
L2-09 KEB Minimum
Freqency Level
(048D)
The amount of decrease is determined by the following conditions.
• Motor rated slip × (L2-09/100)
• The larger value between the value calculated with L2-08 and the value calculated with L2-09
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
V/f CL-V/f OLV CLV AOLV
Sets the acceleration time used for the frequency to return to the frequency
reference in effect before a power loss after the KEB operation is canceled.
V/f CL-V/f OLV CLV AOLV
Sets the amount of output frequency reduction used when KEB operation
starts, as a percentage of the motor rated slip before KEB operation startup.
V/f CL-V/f OLV CLV AOLV
Sets the amount of output frequency reduction used when KEB operation
starts, as a percentage of the motor rated slip.
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
11.9 L: Protection Function
Default Setting
(Range)
0.0 s
(0.0 to 6000.0 s)
Default Setting
(Range)
100%
(0 - 300%)
Default Setting
(Range)
20%
(0 - 100%)
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