66
4.3.9
Higher accuracy operation using a motor with encoder (Vector control)
(Pr.71, Pr.80, Pr.81, Pr.359, Pr.369, Pr.800)
* Use
Pr. 178 to Pr. 189
to assign the terminals used for the X18 and MC signal.
(Refer to Chapter 4 of
the Instruction Manual (Applied).)
Full-scale vector control can be performed fitting the FR-A7AP/FR-A7AL (option) and using a motor with encoder.
Fast response/high accuracy speed control (zero speed control, servo lock), torque control, and position control
can be performed.
•
What is vector control?
Excellent control characteristics when compared to V/F control and other control techniques, achieving the
control characteristics equal to those of DC machines.
It is suitable for applications below.
· To minimize the speed fluctuation even at a severe load fluctuation
· To generate low speed torque
· To prevent machine from damage due to too large torque (torque limit)
· To perform torque control or position control
· Servo-lock torque control which generates a torque at zero speed (i.e. status of motor shaft = stopped)
Parameter
Number
Name
Initial
Value
Setting Range
Description
71
Applied motor
0
0 to 8, 13 to 18, 30,
33, 34, 40, 43, 44,
50, 53, 54
By selecting a standard motor or constant-torque
motor, thermal characteristic and motor constants of
each motor are set.
80
Motor capacity
9999
0.4 to 55kW
Set the applied motor capacity.
9999
V/F control
81
Number of motor poles
9999
2, 4, 6, 8, 10
Set the number of motor poles.
12, 14, 16, 18, 20
X18 signal-ON:V/F control
Set 10 + number of
motor poles.
9999
V/F control
359
Encoder rotation
direction
1
0
1
369
Number of encoder
pulses
1024
0 to 4096
Set the number of pulses of the encoder.
Set the number of pulses before multiplied by four.
800
Control method selection
20
0
Speed control
Vector control
1
Torque control
2
MC signal-ON:torque
MC signal-OFF:speed
3
Position control
4
MC signal-ON:position
MC signal-OFF:speed
5
MC signal-ON:torque
MC signal-OFF:position
9
Vector control test operation
(Refer to Chapter 4 of
the Instruction Manual
(Applied).)
10 to 12
Real sensorless vector control
(Refer to page 64)
20
V/F control (Advanced magnetic flux vector control)
Vector
Vector
Vector
A
Encoder
CW
Clockwise direction as viewed
from A is forward rotation
CCW
A
Encoder
Counter clockwise direction as
viewed from A is forward rotation
