5.8 L: Protection Functions
252 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
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. 93
Figure 5.93 KEB Operation Using L2-10, Without KEB Input
KEB Ride-Thru Operation as Long as CPU Has Power, KEB Input 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 L2-10, 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 digital input assigned to KEB Ride-Thru is still active, then the drive
continues to decelerate. If the DC bus voltage has risen above L2-11 and the terminal that initiated KEB Rid-Thru is
released, then operation resumes.
Figure 5. 94
Figure 5.94 KEB Operation Using L2-10 and KEB Input
L2-01 = 5
KEB operation ends when the motor has come to a stop, even if the power returns and the digital input terminal that
initiated KEB Ride-Thru is cleared.
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
L2-11 (Desired DC Bus Voltage)
DC bus voltage
KEB Digital Input
Main Power Supply
Output Frequency
L2-05 (Uv Detection Level)
0 Hz
0 V
0 V
KEB deceleration is
triggered by DC bus voltage
KEB restart after
L2-02 has passed
Power Loss
Power loss longer than L2-10Power loss shorter than L2-10
L2-10 (Minimum KEB
Operation Time)
L2-11 (Desired DC Bus Voltage)
L2-05 (Uv Detection Level)
0 Hz
0 V
0 V
KEB deceleration is
triggered by DC bus voltage
KEB restart after
L2-02 has passed
Power Loss
L2-10 (Min.
KEB
Operation
Time)
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