2.9 L: Protection Functions
366 YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING
Figure 2.104 Cancel the KEB Operation after the Momentary Power Loss Ride-Thru Time Is Expired without KEB Ride-
Thru
*1 When L2-07 = 0.00 [Kinetic Energy Backup Accel Time = 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 Momentary Power Loss Ride-Thru Time and KEB Ride-Thru to Cancel KEB Operation
shows an example with this configuration:
• L2-01 = 3.
• 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. The drive decelerates for the time set in parameter L2-10, then it
measures the DC bus voltage and the status of the digital input terminal set for KEB Ride-Thru. When the DC bus
voltage is less than the level set in L2-11 [KEB DC Bus Voltage Setpoint], or if the KEB digital input is active, KEB
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.
If the time set in L2-02 is expired, the drive detects Uv1. When you cancel the KEB Ride-Thru, the motor accelerates
again, and usual operation continues.
Figure 2.105 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.
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