YASKAWA GA700 - Page 949

Parameter Details
11
11.9 L: Protection Functions
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 949
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 11.131 Use the KEB Ride-Thru to Cancel KEB Operation when Restoration of Power Occurs while the Control
Power (Power Supply to the Control Board) is Maintained
*1 When L2-07 = 0.00, 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. 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. If you do not input the Run command, the motor cannot restart.
■ KEB Operation Wiring Example
Figure 11.132 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:
• A dynamic braking option is necessary for System KEB Ride-Thru 1 [L2-29 = 2].
• If you turn off the Run command, the drive will not accelerate back to speed when you return power.
Figure 11.132 KEB Function Wiring Example
■ Parameters for KEB Ride-Thru
Table 11.71 shows the parameters that adjust the KEB Ride-Thru function. Parameter settings are different for the
different KEB methods set in L2-29 [Kinetic Energy Backup Method].