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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
selection
×
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 detec-
tors
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
Replacing existing mo-
tor for which motor
constants
are
not
known.
S
When autotuning is not
possible.
S
Simple speed feedback
control.
S
When a pulse generator
is attached to the ma-
chine 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
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