Rockwell Automation GV3000/SE AC Gen. Purpose and Vector Drive Software Start-Up and Ref. Manual - Manual (Page 126)

4-40 GV3000/SE AC Drive Software Reference, Version 6.06
For V/Hz control, the drive provides open-loop volts per hertz regulation which is
appropriate for general purpose applications.
For vector control, you may select either flux vector control (FVC) or sensorless vector
control (SVC).
Flux vector control uses the actual encoder value for speed feedback and, therefore,
requires an encoder mounted to the motor and connected to the drive.You program
the drive for FVC by first selecting UEC in parameter U.048, and then selecting the
PPR value of the encoder in parameter U.001.
Sensorless vector control (SVC) is an extension of the FVC regulator. It provides
performance close to FVC without using an encoder. Control is based on estimated
speed feedback. You program the drive for SVC by first selecting UEC in parameter
U.048 and then selecting SE in parameter U.001 (Encoder PPR).
Switching from one regulator type to the other (V/Hz to vector or vice versa) takes
approximately 5 seconds. The drive reinitiates power-up diagnostics (SELF appears
on the display and all LEDs turn on for approximately 4 seconds).
Changing this parameter also restores default values for all First and Second Menu
General parameters (P.---) as if a Restore Defaults command (P.050 = ON) was given.
However, this will NOT change the value of P.048 or P.049 (Country Defaults).
Important: All other parameter values must be verified if this parameter is changed
after initial programming, regardless of whether they are restored to their
default values.
P.048 Volts/Hertz or Vector Regulation
This parameter
selects the drive
regulator type:
volts/hertz (V/Hz) or
vector.
Parameter Range: U-H = V/Hz control
UEC = vector control
Default Setting: U-H
Parameter Type: Configurable
Refer also to parameters: U.001 Encoder PPR
P.049 Country Defaults
This parameter
selects the factory
default settings for
the First and Second
Menu General
parameters. USA
default settings are
listed throughout this
chapter. Refer to
Appendix E for the
European and
Japanese default
settings.
Parameter Range: USA = USA default settings
EUr = European default settings
JPn = Japanese default settings
Default Setting: USA
Parameter Type: Configurable
Refer also to parameters: N/A