Rockwell Automation GV3000/SE AC Gen. Purpose and Vector Drive Software Start-Up and Ref. Manual - Manual (Page 168)

4-82 GV3000/SE AC Drive Software Reference, Version 6.06
If DC bus voltage exceeds a predetermined threshold, the drive generates a high bus
alarm (HIdc). If U.024 = ON, the drive attempts to regulate the bus to avoid a high bus
fault (HU). Note that this may extend the programmed deceleration time (P.002,
P.018). See table 5.1 in chapter 5 for the alarm thresholds.
Set this parameter to OFF if a dynamic braking unit is connected to the drive.
For SVC operation, drive speed may increase as much as 5% above the speed
reference in an attempt to decrease the DC bus voltage level.
This feature provides the capability to hold the motor at zero speed at the end of a
ramp stop for a user-specified amount of time (U.025). During the zero speed hold
time period, the running status indicator remains on.
For FVC operation, a zero speed reference is applied for the time specified in U.025,
regulating torque based on load. Note that this will override the Minimum Speed
setting (P.003).
For SVC operation, magnetizing current is applied for the time specified in U.025.
U.024 High DC Bus Fault Avoidance Enable
This parameter
selects how the drive
responds to high bus
voltage.
This feature is not
available if the drive
is configured as a
torque regulator.
Parameter Range: OFF = Drive will not attempt to regulate the DC bus
on a high bus condition
ON = Drive will attempt to regulate the DC bus on a
high bus condition
Default Setting: OFF
Parameter Type: Tunable
Refer also to parameters: P.002 Decel Time 1
P.018 Decel Time 2
U.025 Zero Speed Hold Time
This parameter
selects the amount of
time for which zero
speed is held at the
end of a ramp stop
sequence.
Parameter Range: 0.0 to 655.0 seconds
Default Setting: 0.0
Parameter Type: Tunable
Refer also to parameters: N/A
!
ATTENTION: The motor is energized when the drive is operating at zero
speed. The user is responsible for ensuring safe conditions for operating
personnel by providing suitable guards, audible or visual alarms, or other
devices to indicate that the drive is operating at zero speed. Failure to
observe this precaution could result in severe bodily injury or loss of life.