YASKAWA GA700 Series

12.9 L: Protection Functions
878 YASKAWA SIEPC71061705H GA700 Series Technical Manual
Figure 12.126 KEB Operation through KEB Ride-Thru Input
■ 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 12.127 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