Parameter Details
11
11.9 L: Protection Functions
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 947
Figure 11.127 KEB Operation through KEB Ride-Thru Input
■ KEB Ride-Thru End Detection
Parameter L2-01 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
Figure 11.128 shows an example that uses this configuration:
• L2-01 = 3 [Power Loss Ride Through Select = Kinetic Energy Backup: L2-02].
• KEB Ride-Thru is not used.
The drive starts deceleration through KEB operation. The drive stops the 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 11.128 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
Figure 11.129 shows an example that uses 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. If the voltage level is more than the level set in L2-11, it continues usual
operation. The drive accelerates the motor to the frequency reference value used before the power loss, and usual
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