YASKAWA GA800 Programming Manual page 443

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KEB Ride-Thru End Detection
Parameter L2-01 [Power Loss Ride Through Select] and a digital input programmed for KEB set the KEB function
end detection.
Use the Momentary Power Loss Ride-Thru Time to Cancel KEB Operation
shows an example with this configuration:
• L2-01 = 3 [Kinetic Energy Backup: L2-02] is set.
• KEB Ride-Thru is not used.
The drive starts deceleration through KEB operation. When the time set in L2-10 [Minimum KEB Time] expires, the
drive stops the KEB operation and then it accelerates the motor again until it is at the frequency reference value used
before the power loss.
If you do not return the DC bus voltage in the time set in L2-02 [Power Loss Ride Through Time], the drive detects
Uv1 [DC Bus Undervoltage] and the drive turns off its output.
Figure 2.124 Cancel the KEB Operation after the Momentary Power Loss Ride-Thru Time Is Expired without KEB Ride-
*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.
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
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2.9 L: Protection Functions
2
443