YASKAWA GA700 Series Technical Manual page 880

12.9 L: Protection Functions
accelerates the motor to the frequency reference value before the power loss, and usual operation continues. When
the KEB Ride-Thru continues to be input after the time set in L2-02 is expired, the drive uses the KEB Ride-Thru
function to continue to decelerate. When you cancel the KEB Ride-Thru, the motor accelerates again, and usual
operation continues.
Figure 12.130 Use the KEB Ride-Thru to Cancel KEB Operation when Restoration of Power Occurs while the Control
*1 When L2-07 = 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.
KEB Operation when L2-01 = 5 [Kinetic Energy Backup: DecelStop]
The drive starts deceleration through KEB operation. If you do not input the Run command, the motor cannot
restart. The drive will continue to decelerate until the motor comes to the minimum output frequency or a
complete stop. If you return power during deceleration, the drive continues to decelerate.
■
KEB Operation Wiring Example
Figure 12.131 shows an example that uses an undervoltage relay to trigger the KEB Ride-Thru at power loss.
When a power loss occurs, the undervoltage relay triggers KEB Ride-Thru [H1-06 = 65, 66, 7A, 7B] at terminal
S6.
Note:
• Set the drive to activate the Run command while the KEB function is operating. If you turn off the Run command, the drive will not
accelerate back to speed when you return power.
• When you set L2-29 = 2 [Kinetic Energy Backup Method = System KEB Ride-Thru 1], install a dynamic braking option.
880
Power (Power Supply to the Control Board) is Maintained
Figure 12.131 KEB Function Wiring Example
YASKAWA SIEPC71061705H GA700 Series Technical Manual