12.9 L: Protection Functions
700 YASKAWA SIEPC71061753C GA500 Technical Manual
Figure 12.114 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 12.115 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].
The drive starts deceleration through KEB operation. When the motor decelerates for the time set in L2-10, the
drive measures the DC bus voltage and the status of the digital input set for KEB Ride-Thru. When the DC bus
voltage is less than the level set in L2-11, or if the digital input set to KEB Ride-Thru is active, deceleration
continues. When the DC bus voltage is more than the level set in L2-11, the drive ends KEB operation. The drive
accelerates the motor to the frequency reference value before the power loss, and usual operation continues. When
the KEB Ride-Thru continues to be input after the time set in L2-02 is expired, the drive uses the KEB Ride-Thru
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