Rockwell Automation GV3000/SE AC Gen. Purpose & Vector Bookshelf Drive Start-Up and Reference Manual - Manual (Page 117)

Programming Reference 4-31
When P.027 is set to 0, the forward/reverse input allows forward or reverse rotation of
the motor.
When P.027 is set to 1, reverse rotation of the motor is prohibited and the
forward/reverse selection from the front panel or serial port is set to forward. Note that
reverse rotation is prohibited regardless of the polarity of the speed reference input.
When P.027 is set to 2, the state of the forward/reverse input is latched when the
motor is started (RUN LED is on). Direction changes requested from any control
source after the motor is started are ignored. Note, however, that this selection will not
inhibit a motor direction change due to a change in the polarity of the speed reference
input.
In V/Hz or SVC regulation, setting H.016 (Sync Mode Direction) or U.031 (SVC Sync
Direction) to any value but F or OFF may cause the motor to operate in the reverse
direction briefly regardless of the setting in P.027.
For vector regulation, P.028 will correspond to U.017:
Actual Speed in RPM x P.028 = value displayed when speed monitor mode or
U.017 selected reference is selected.
P.027 Forward/Reverse Configuration
This parameter
specifies how the
motor responds to
forward or reverse
inputs from any
control source. Parameter Range: 0 = Forward or reverse enabled from the selected
control source
1 = Reverse disabled from the selected control
source
2 = The state of the forward/reverse input is latched
when the motor is started
Default Setting: 0
Parameter Type: Tunable
Refer also to parameters: N/A
P.028 Speed Display Scaling
This parameter
defines the scaling
value applied to the
manual reference,
the selected speed
reference, and the
output speed
displays. Parameter Range: 10 to 9999
Default Setting: Synchronous speed based on H.001 (assuming a
4-pole motor) (V/Hz)
U.017 (vector)
Parameter Type: Tunable
Refer also to parameters: U.017 Motor Top Speed
H.001 Motor Nameplate Base Frequency