YASKAWA GA700 Technical Manual page 835

Power supply
KEB Ride-Thru 1/2
DC bus voltage
Output frequency
■
KEB Ride Thru End Detection
The KEB function end detection depends on the setting of parameter L2-01 and whether a digital input
programmed for KEB is used.
Cancel KEB Operation by Using the Momentary Power Loss Ride-Thru Time
The following example illustrates an example when the configuration is as follows.
• L2-01 = 3 [Momentary Power Loss Ope Select = KEB Mode] is set.
• KEB Ride-Thru is not used.
The drive starts deceleration via KEB operation. The drive stops the KEB operation once the time set in L2-10
[KEB Detect Time (Min KEB Time)] elapses and then reaccelerates the motor until the frequency reference value
used before the power loss is reached.
When the DC bus voltage still is not restored within the time set in L2-02 [MomentaryPowerLossRide-Thru
Time], Uv1 [DC Bus Undervoltage is detected, and the drive shuts off its output.
Figure 11.122 Cancel the KEB Operation after the Momentary Power Loss Ride-Thru Time Elapses without Using the
*1 When setting L2-07 = 0.00 [KEB Acceleration Time = 0.00 s], the drive reaccelerates in accordance with the
valid Acceleration Time [C1-01, C1-03, C1-05, C1-07], and normal operation resumes.
Cancel KEB Operation by Using the Momentary Power Loss Ride-Thru Time and KEB Ride-Thru
The following example illustrates an example when the configuration is as follows.
• L2-01 = 3 is set.
• Use KEB Ride-Thru 1 [H1-xx = 65, 66] or KEB Ride-Thru 2 [H1-xx = 7A, 7B].
The drive starts deceleration via KEB operation. After decelerating for the time set in parameter L2-10, the drive
checks the DC bus voltage and the status of the digital input terminal set for KEB Ride-Thru. If the DC bus
voltage is still below the level set in L2-11 [DC Bus Vol Setpoint during KEB] or if the KEB digital input is still
active, KEB deceleration continues. If the voltage level has risen above the value set to L2-11, then normal
operation is resumed. The motor is accelerated to the frequency reference value used before the power loss, and
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Power loss
0 V
L2-10
0 V
KEB deceleration is
triggered by DC bus voltage.
0 Hz
Figure 11.121 KEB Operation via KEB Ride-Thru Input
KEB Ride-Thru
KEB Ride-Thru is set within L2-10.
L2-11 (DC Bus Vol Setpoint during KEB)
L2-05 (Undervoltage Detect Level (Uv1))
KEB operation continues even
after the voltage has returned.
11.9 L: Protection Function
11
835