Rockwell Automation GV3000/SE AC Gen. Purpose and Vector Drive Software Start-Up and Ref. Manual - Manual (Page 123)

Programming Reference 4-37
If DC bus voltage drops below the low DC bus voltage threshold for more than the time
set in P.042, fault code LU is logged. After line voltage has been restored, the fault
must be reset, and then the drive may be restarted.
If line voltage is restored before the specified time is exceeded, the drive will
accelerate to operating speed at the rate specified in P.001 (Accel Time 1).
For V/Hz regulation, alarm code LIL will flash on the display during a line dip
ride-through. The levels for LIL and LU depend on the parameter setting for AC Line
Voltage (H.021).
Important: The drive will restart after a reset if the start input is still asserted.
If the auto reset feature is enabled (P.043 ≠ 0), faults detected while the drive is
running are logged and reset. The drive will then wait the amount of time specified in
P.044 (Fault Auto Reset Time) and, if the start input is asserted from the selected
control source, start the drive automatically. Note that the drive must run for at least
five minutes in order to reset the number of fault reset attempts to the value in P.043.
If the fault occurs again, the drive will wait and try to re-start up to the programmed
number of attempts. If the drive faults on all of these attempts, it will remain in the
faulted state and will display the fault code on the keypad/display.
P.042 Line Dip Ride-Through Time
For V/Hz regulation,
this parameter sets
the maximum time
allowed for the drive
to stay active during
low line voltage or
line voltage loss.
For vector regulation,
this value is fixed at
500 ms.
Parameter Range: 0.1 to 999.9 seconds (V/Hz)
500 ms (vector)
Default Setting: 5.0
Parameter Type: Configurable
Refer also to parameters: H.017 Input Power/Snubber Configuration
H.021 AC Line Voltage
U.018 AC LIne Voltage
P.043 Fault Auto Reset Attempts
This parameter
selects the number of
times the drive will
attempt to reset drive
faults.
Parameter Range: 0 to 10
Default Setting: 0
Parameter Type: Configurable
Refer also to parameters: P.044 Fault Auto Reset Time