YASKAWA E1000 Technical Manual page 218

5.8 L: Protection Functions
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 5.70
Main Power Supply
0 V
KEB Digital Input
DC bus voltage
0 V
common_TMonly
Output Frequency
0 Hz
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.
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KEB Operation Wiring Example
Figure 5.71 shows a wiring example for triggering the KEB Ride-Thru at power loss using an undervoltage relay. If
power loss occurs, the undervoltage relay triggers KEB Ride-Thru at terminal S6 (H1-06 = 65, 66, 7A, 7B).
Note: Make sure the Run command is not switched off during momentary power loss. If the Run command is shut off, the drive will
not accelerate back to speed when the power is restored.
Figure 5.71
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Parameters for KEB Ride-Thru
Table 5.31 lists parameters needed to set up KEB Ride-Thru depending the type of KEB Ride-Thru selected in L2-29.
Parameter Name
C1-09 Fast Stop Time
L2-05 Undervoltage Detection Level
218
Power loss shorter than L2-10
Power Loss
L2-10 (Minimum KEB
Operation Time)
KEB deceleration is
triggered by DC bus voltage
Figure 5.70 KEB Operation Using L2-10 and KEB Input
L1
L2
L3
UV Detection
Relay
Figure 5.71 KEB Function Wiring Example
Table 5.31 KEB Function Related Adjustments
• Increase if an overvoltage fault (ov) occur during KEB deceleration.
• Decrease if an undervoltage fault (Uv1) occurs during KEB deceleration.
Increase if an undervoltage fault (Uv1) fault occurs at KEB operation start in order to let the drive detect
power loss more quickly.
0 V
L2-11 (Desired DC Bus Voltage)
L2-05 (Uv Detection Level)
0 V
KEB restart after
L2-02 has passed
KEB deceleration is
triggered by DC bus voltage
0 Hz
R/L1
U/T1
S/L2
V/T2
T/L3
W/T3
S6 - KEB command 1 or 2
S1 - Start command
SC
Setting Instructions
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
Power loss longer than L2-10
Power Loss
L2-11 (Desired DC Bus Voltage)
L2-05 (Uv Detection Level)
L2-10 (Min.
KEB
KEB restart after
Operation
L2-02 has passed
Time)
M
common_TMonly
KEB Mode
(L2-29)
0 1
YES NO
YES YES