Yaskawa G5HHP Drive - Manual (Page 121)

6.1 Common Settings
6 - 3
J
Control Method: A1-02
D
Select one of the four control methods.
D
This constant is not initialized by the initialize operation.
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
A1-02
Control method selec-
tion
x 0 to 3 --
2
Open
Loop
Vector
Q Q Q Q
D
Control Method Settings
Setting Control Method Function
0 V/f control Normal V/f control
1 V/f control with PG feed-
back
V/f control using a PG Speed Control Card
2 Open loop vector control Vector control using the Inverter’s internal speed information
3 Flux vector control Vector control using a PG Speed Control Card
D
The characteristics of each control method are shown in Table 6.1.
Table 6.1 Control Method Characteristics
Characteristic V/f Control
V/f Control w/PG Feed-
back
Open Loop Vector Flux Vector
Basic control method
Voltage/frequency control
(open loop)
Voltage/frequency control
with speed compensation
Current vector control
without PG
Current vector control with
PG
Speed detector Not required
Required
(pulse generator)
Not required
Required
(pulse generator)
Optional speed detectors Not required PG-A2 or PG-D2 Not required PG-B2 or PG-X2
Speed control range 1:40 1:40 1:100 1:1000
Starting torque 150%/3 Hz 150%/3 Hz 150%/1 Hz 150%/0 r/min
Speed control accuracy ±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
S Multiple motor drives.
S Replacingexistingmotor
for which motor
constants are not known.
S When autotuning is not
possible.
S Simple speed feedback
control.
S When a pulse generatoris
attached to the machine
axis.
S Variable speed drive ap-
plications.
S Simple servo drives.
S Precision speed control.
S Torque control.
D
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:
•
When several motors are being operated
•
When special motors, such as submersible motors or spindle motors, are being used
(situations in which auto-tuning cannot be used)
•
When operation is being coordinated with an older V/f control inverter control system
6