Omron SYSDRIVE 3G3FV, User Manual, Page: 126 / 400

5-4
Control Mode Characteristics
Characteristic V/f Control V/f w/PG Fdbk Open Loop Vector Flux Vector
Basic control method Voltage/frequency
control (open loop) Voltage/frequency
control with speed
compensation Current vector con-
trol without PG Current vector con-
trol with PG
Speed detector Not required Required
(pulse generator) Not required Required
(pulse generator)
Optional Speed
Detectors Not required 3G3FV-PPGA2 or
3G3FV-PPGD2 Not required 3G3FV-PPGB2 or
3G3FV-PPGX2
Speed control range 1:40 1:40 1:100 1:1,000
Starting torque 150%/3 Hz 150%/3 Hz 150%/1 Hz 150%/0 Hz
Speed control preci-
sion
±
2 to 3%
±
0.03%
±
0.2%
±
0.02%
Torque limit Not possible Not possible Possible Possible
Torque control Not possible Not possible Not possible Possible
Example applications
•
Multiple motors
•
Simple speed
feedback control
•
Variable speed
drive applications
•
Simple servo
drives
•
Precision speed
control
•
Torque control
Note Vector control has a greater starting torque and more precise speed control than V/f control, so
use of vector control is recommended whenever possible. Use V/f control in the following types of
applications:
S
When several motors are being operated
S
When special motors such as submersible motors or spindle motors are being used
(Situations in which auto-tuning cannot be used.)
S
When operation is being coordinated with an older inverter control system
5-1-2 Frequency Reference Settings from Control Circuit
Terminals
These settings are required when inputting analog voltage or current signals from the control circuit
terminals.
H
Frequency Reference Selection (b1-01)
Parameter b1-01 is used to select the reference source; it cannot be changed during operation.
Parameter Display name Setting Units Default
Valid access levels
number
p y g
range setting
V/f
Control
V/f with
PG
Open Loop
Vector
Flux
Vector
b1-01 Reference Source 0 to 4 --- 1 Quick-start, Basic, or Advanced
Basic Operation
Chapter 5