Parameter Details1111.9 L: Protection FunctionYASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual 841• L2-06 = 0Parameter C1-09 [Fast Stop Time] is automatically reduced to the base value so that the DC bus voltage doesnot fall below the low voltage detection level. The setting of L2-02 [Momentary Power Loss Ride-Thru Time] isignored in this case.• L2-06 ≠ 0As illustrated in the following figure, the frequency reference decelerates until it reaches the KEB frequencylevel in accordance with the deceleration rate of L2-06 and then returns to the original frequency reference inaccordance with C1-01 [Acceleration Time 1]. The KEB frequency level is determined by the setting value ofthe 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 TimeNo.(Hex.) Name Description Default Setting(Range)L2-07(048B)KEB AccelerationTime Sets the acceleration time used for the frequency to return to the frequencyreference in effect before a power loss after the KEB operation is canceled.0.0 s(0.0 to 6000.0 s)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 StartNo.(Hex.) Name Description Default Setting(Range)L2-08(048C)Frequency Gain atKEB Start Sets the amount of output frequency reduction used when KEB operationstarts, as a percentage of the motor rated slip before KEB operation startup.100%(0 - 300%)Reduces the output frequency in steps to quickly set the motor to a regenerative state. Calculate the value usingthe following expression.Output frequency reduction = Motor rated slip before KEB operation × (L2-08/100 ) × 2■ L2-09: KEB Minimum Freqency LevelNo.(Hex.) Name Description Default Setting(Range)L2-09(048D)KEB MinimumFreqency Level Sets the amount of output frequency reduction used when KEB operationstarts, as a percentage of the motor rated slip.20%(0 - 100%)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 L2-09V/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLVV/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLVV/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLV
