YASKAWA CIPR-GA50C series Technical Manual page 672

12.9 L: Protection Functions
n this example, the drive detects that the DC bus voltage is less than the level set in L2-05 and starts the KEB
operation. When you return power during KEB operation, the drive will continue KEB operation when the KEB
Ride-Thru is input, although the time set in L2-10 [Minimum KEB Time] expired. The motor accelerates again
after you cancel the KEB Ride-Thru.
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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 12.110 Cancel the KEB Operation after the Momentary Power Loss Ride-Thru Time Is Expired without KEB
*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].
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Figure 12.109 KEB Operation through KEB Ride-Thru Input
Ride-Thru
YASKAWA SIEPC71061753A GA500 Technical Manual