2.9 L: Protection Functions
444 YASKAWA TOEPYAIGA8002B GA800 Drive Programming
Figure 2.125 Use the Momentary Power Loss Ride-Thru Time and KEB Ride-Thru to Cancel KEB Operation
*1 When L2-07 = 0.00, the drive accelerates again as specified by the applicable Acceleration Time [C1-01, C1-03,
C1-05, C1-07], and usual operation continues.
Cancel KEB Operation When Restoration of Power Occurs while the Control Power (Power Supply to the
Control Board) is Maintained
shows an example with this configuration:
• L2-01 = 4 [Kinetic Energy Backup: CPU Power] is set.
• KEB Ride-Thru is not used.
The drive starts deceleration through KEB operation. The drive decelerates for the time set in parameter L2-10, and
then measures the DC bus voltage level. When the DC bus voltage is lower than the level set in L2-11, the drive uses
the KEB Ride-Thru function to continue deceleration. When the DC bus voltage is more than the level set in L2-11,
usual operation continues. The drive accelerates the motor to the frequency reference value before the power loss, and
usual operation continues.
Figure 2.126 Cancel KEB Operation without Using the KEB Ride-Thru if Restoration of Power Occurs while the Control
Power (Power Supply to the Control Board) is Maintained
*1 When L2-07 = 0.00 s, the drive accelerates again as specified by the applicable Acceleration Time [C1-01, C1-
03, C1-05, C1-07], and usual operation continues.
Use the KEB Ride-Thru to Cancel KEB Operation when Restoration of Power Occurs while the Control Power
(Power Supply to the Control Board) is Maintained
shows an example with this configuration:
• L2-01 = 4.
• Use KEB Ride-Thru 1 [H1-xx = 65, 66] or KEB Ride-Thru 2 [H1-xx = 7A, 7B].
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