Higher Accuracy Operation Using A Motor With Encoder (Vector Control) (Pr.71, Pr.80, Pr.81, Pr.359, Pr.369, Pr.800) - Mitsubishi Electric FR-A700 Instruction Manual

3.3.9 Higher accuracy operation using a motor with encoder (Vector control)
(Pr.71, Pr.80, Pr.81, Pr.359, Pr.369, Pr.800)
Full-scale vector control can be performed fitting the FR-A7AP 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
Name
Number
71 Applied motor
80 Motor capacity
81 Number of motor poles
Encoder rotation
359
direction
Number of encoder
369
pulses
800 Control method selection
* Use Pr. 178 to Pr. 189 to assign the terminals used for the X18 and MC signal. (Refer to section 4 of
Initial
Setting Range
Value
0 to 8, 13 to 18, 20,
0 23, 24, 30, 33, 34, 40, 43,
44, 50, 53, 54
55K or less 0.4 to 55kW
9999 75K or more 0 to 3600kW
9999
2, 4, 6, 8, 10
9999 12, 14, 16, 18, 20
9999
0
1
1
1024 0 to 4096
0
1
2
3
4
20
5
9
10 to 12
20
Vector Vector Vector
Description
By selecting a standard motor or constant
torque motor, thermal characteristic and motor
constants of each motor are set.
Set the applied motor capacity.
V/F control
Set the number of motor poles.
X18 signal-ON:V/F
control
*
V/F control
A
Encoder
Clockwise direction as viewed
from A is forward rotation
A
Encoder
Counter clockwise direction as
viewed from A is forward rotation
Set the number of pulses of the encoder.
Set the number of pulses before multiplied by
four.
Speed control
Torque control
MC signal-ON:torque
MC signal-OFF:speed
Position control
MC signal-ON:position
MC signal-OFF:speed
MC signal-ON:torque
MC signal-OFF:position
Vector control test operation
(Refer to section 4 of
(applied))
Real sensorless vector control
(Refer to page 55)
V/F control (advanced magnetic flux vector
control)
Instruction Manual (applied)).
Before operation
Set 10 + number of
motor poles.
CW
CCW
*
Vector control
*
*
Instruction Manual
57
3