When using a digital input to trigger KEB operation and the device controlling the input acts relatively slow, set a minimum
KEB operation time in parameter L2-10. In the example below, the DC bus voltage triggers KEB operation and a digital input
triggers the Hold command.
L2-05 (Uv Detection Level)
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 digital input is
set with in L2-10
Input holds KEB operation,
even though voltage has
returned
L2-11 (Desired DC Bus Voltage)
Power loss
Figure 5.71 KEB Operation Using a KEB Input
n
KEB Ride-Thru End Detection
The KEB function end detection depends on the setting of parameter L2-01 and whether a digital input programmed for KEB
(H1-oo = 65, 66, 7A, 7B) is used.
KEB Ride-Thru Operation in L2-02, Input Terminals Not Used
Here, L2-01 = 3 and the input terminals have not been set for KEB Ride-Thru (H1-oo does not equal 65, 66, 7A, 7B). After
decelerating for the time set in parameter L2-02, the drive ends KEB operation and attempts to accelerate back to the frequency
reference. A Uv1 fault occurs and the drive output shuts off if the power does not return within the time set to L2-02.
L2-11 (Desired DC Bus Voltage)
L2-05 (Uv Detection Level)
L2-11 (Desired DC
Bus Voltage)
L2-05 (Uv Detection Level)
0 Hz
L2-02
(Power Loss
Ride-Thru Time)
0 V
0 V
KEB Deceleration
Acceleration using L2-07 or
C1-01/03/05/07 if L2-07 = 0
Power Loss shorter than L2-02
0 Hz
L2-02
(Power Loss
Ride-Thru Time)
0 V
0 V
KEB Deceleration
Drive attempts to restart but
power has not returned
Uv1 fault is triggered
Power Loss longer than L2-02
Power Loss
Power Loss
DC Bus Voltage
Main Power Supply
Output Frequency
Figure 5.72 KEB Operation Using L2-02, Without KEB Input
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-oo = 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: If L2-10 is set to a longer time than L2-02, the drive checks the DC bus voltage level and the status of the terminal assigned to KEB Ride-
Thru after the time set to L2-02 passes. The drive will then try to restart.
5.8 L: Protection Functions
242
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
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