YASKAWA VS-616G5 Series Programming Manual page 106

Section L: Protection Parameters
L2 Power Loss Ridethrough
KEB Ridethrough
Multi-function Input Contact
(H1-__ = "65" or "66")
Output Frequency
In system applications requiring multiple drives with a common DC bus, KEB ride-through functions
differently. The inverter decelerates from the output frequency to the KEB frequency level, according
to the momentary power loss ridethough time (L2-02). The KEB frequency constant (L2-06) is set
according to the following equation:
This method is ideal when helper drives are being used on a film line, and a loss of power might cause
a line break. This method will allow synchronized deceleration for all of the common-bus drives, to
prevent speed deviation and thus a possible line break. If power is restored within the recovery time
(L2-02), then the inverter accelerates to the previous frequency reference according to acceleration
time 1 (C1-01).
106
OFF
Figure 50 KEB Ridethrough Timing Diagram
KEB Frequency Level = Output Frequency (1 -
OFF
ON
L2-06
L2-02 (common bus)
L2-06
100%
C1-01
L2-06
Fout (1 - )
100%
)
VS-616G5 Programming Manual