5.8 L: Protection FunctionsYASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 277Parameter Details5KEB Ride-Thru Operation Within L2-02, Input Terminals UsedHere, L2-01 = 3 and an input terminal is set to issue KEB Ride-Thru (H1- = 65, 66, 7A, 7B). After decelerating forthe time set in parameter L2-02, the drive checks the DC bus voltage and the status of the digital input. If the DC busvoltage is still below the level set in L2-11 or if the KEB digital input is still active, KEB deceleration continues. If thevoltage level has risen above the value set to L2-11, then normal operation is resumed.Note: The time set in L2-02 has priority over L2-10. Even if L2-10 is set to a longer time than L2-02, once the time in L2-02 passes, thedrive will check the DC bus voltage level and the status of the terminal assigned to KEB Ride-Thru, then try to restart.Figure 5.97Figure 5.97 KEB Operation Using L2-02 and KEB InputKEB Ride-Thru Operation as Long as CPU Has Power, KEB Input Not UsedHere, L2-01 = 4 and the input terminals have not been set for KEB Ride-Thru (H1- does not equal 65, 66, 7A, 7B).After decelerating for the time set in parameter L2-10, the drive checks the DC bus voltage level. If the DC bus voltage islower than the level set in L2-11, then deceleration continues. Once the DC bus voltage rises above the value of L2-11,normal operation is resumed.Figure 5.98Figure 5.98 KEB Operation Using L2-10, Without KEB InputL2-11 (Desired DC Bus Voltage)0 HzDC bus voltage0 V0 VKEB Digital InputMain Power SupplyOutput FrequencyL2-10KEB deceleration istriggered by DC bus voltageKEB restart triggered bydigital input releaseL2-02(Power LossRide-Thru Time)L2-05 (Uv Detection Level)0 Hz0 V0 VL2-10KEB deceleration istriggered by DC bus voltageKEB restart afterL2-02 has passedL2-02(Power LossRide-Thru Time)Power LossPower LossPower loss longer than L2-02Power loss shorter than L2-02L2-05 (Uv Detection Level)L2-11 (Desired DC Bus Voltage)L2-11 (Desired DC Bus Voltage)L2-05 (Uv Detection Level)0 Hz0 V0 VKEB DecelerationAcceleration using L2-07 orC1-01/03/05/07 if L2-07 = 0Power Loss Shorter than L2-10 Power Loss Longer than L2-10Power LossDC Bus VoltageMain Power SupplyOutput FrequencyL2-10(Min. KEB OperationTimeL2-11 (Desired DC Bus Voltage)L2-05 (Uv Detection Level)0 Hz0 V0 VKEB DecelerationAcceleration using L2-07 orC1-01/03/05/07 if L2-07 = 0Power LossL2-10(Min. KEBOp. Time
