5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual 217
KEB Ride-Thru Operation Within L2-02, Input Terminals Used
Here, L2-01 = 3 and an input terminal is set to issue KEB Ride-Thru (H1- = 65, 66, 7A, 7B). After decelerating for
the time set in parameter L2-02, the drive checks the DC bus voltage and the status of the digital input. If the DC bus
voltage is still below the level set in L2-11 or if the KEB digital input is still active, KEB deceleration continues. If the
voltage 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, the
drive will check the DC bus voltage level and the status of the terminal assigned to KEB Ride-Thru, then try to restart.
Figure 5.68
Figure 5.68 KEB Operation Using L2-02 and KEB Input
KEB Ride-Thru Operation as Long as CPU Has Power, KEB Input Not Used
Here, 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 is
lower 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 5.69
Figure 5.69 KEB Operation Using L2-10, Without KEB Input
L2-11 (Desired DC Bus Voltage)
0 Hz
DC bus voltage
0 V
0 V
KEB Digital Input
Main Power Supply
Output Frequency
L2-10
KEB deceleration is
triggered by DC bus voltage
KEB restart triggered by
digital input release
L2-02
(Powe Loss
Ride-Thur Time)
L2-05 (Uv Detection Level)
0 Hz
0 V
0 V
L2-10
KEB deceleration is
triggered by DC bus voltage
KEB restart after
L2-02 has passed
L2-02
(Powe Loss
Ride-Thur Time)
Power LossPower Loss
Power loss longer than L2-02Power loss shorter than L2-02
L2-05 (Uv Detection Level)
L2-11 (Desired DC Bus Voltage)
L2-11 (Desired DC Bus Voltage)
L2-05 (Uv Detection Level)
0 Hz
0 V
0 V
KEB Deceleration
Acceleration using L2-07 or
C1-01/03/05/07 if L2-07 = 0
Power Loss Shorter than L2-10 Power Loss Longer than L2-10
Power Loss
DC Bus Voltage
Main Power Supply
Output Frequency
L2-10
(Min. KEB Operation
Time
L2-11 (Desired DC Bus Voltage)
L2-05 (Uv Detection Level)
0 Hz
0 V
0 V
KEB Deceleration
Acceleration using L2-07 or
C1-01/03/05/07 if L2-07 = 0
Power Loss
L2-10
(Min. KEB
Op. Time
SIEP_C710616_35.book 217 ページ ２０１５年１１月３０日 月曜日 午後２時２分
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