Flux Vector Control - Mitsubishi Electric FR-A700 Technical Manual

2.7.3 General-purpose magnetic flux vector control (Pr. 71, 80, 81*, 800*)
E700 D700
(E700)(D700)
General-purpose magnetic flux vector control is a control
method which allows low-speed torque to be improved by
dividing the motor current into an excitation current and a
torque current and making voltage compensation to flow a
motor current which meets the load torque.
Initial
[Pr. ] Name
Value
71 Applied motor 0
80 Motor capacity 9999
Number of motor
81 9999
poles
Control method
800 20
selection
≠
* Set [Pr. 80 9999] or [Pr. 81
(1) Conditions of General-purpose magnetic

flux vector control

General-purpose magnetic flux vector control may
only be utilized effectively when all of the following
conditions are satisfied.
If any of the conditions cannot be satisfied, torque
shortage, speed fluctuation or another fault may
occur.
The motor capacity should be equal to or one rank
lower than the inverter capacity.
Note that the motor capacity should be 0.1kW or more.
Compatible motor is any of Mitsubishi standard motor,
high efficiency motor (SF-JR, SF-HR 0.2kW or more) or
Mitsubishi constant-torque motor (SF-JRCA four-pole,
SF-HRCA 0.4kW to 15kW). When using a motor other
than the above (other manufacturer's motor), always
perform offline auto tuning.
Single-motor operation (one motor run by one inverter)
should be performed.
Wiring length from inverter to motor should be within
30m. When the wiring length exceeds 30m, perform
offline auto tuning with wires already in place.
Setting Range
E700
0, 1, 3 to 6, 13 to 16, 23, 24, 40,
43, 44, 50, 53, 54
D700
0, 1, 3, 13, 23, 40, 43, 50, 53
E700
0.1 to 15kW
D700
0.1 to 7.5kW
9999
2, 4, 6, 8, 10
9999
20
30
≠
9999].
(*[Pr. 81, 800] are not available for
Excitation
current
Vector division of motor current
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.
V/F control
Advanced magnetic flux vector control *
General-purpose magnetic flux vector control *
(2) Selection method
magnetic flux vector control
To select General-purpose magnetic flux control for
, set [Pr. 800 = 20] (initial value), and set a
E700
value other than 9999 in [Pr. 80 Motor capacity] and
[Pr. 81 Number of motor poles]. If 9999 is set in either
[Pr. 80] or [Pr. 81], the control method is V/F control.
To select General-purpose magnetic flux control for
, set a value other than 9999 in [Pr. 80 Motor
D700
capacity]. If 9999 is set in [Pr. 80], the control method
is V/F control.
Set [Pr. 71] depending on the motor.
(3) Motor constants setting
In most cases, the setting is not necessary, but
perform offline auto tuning when using other
manufacture's motor or a long wiring.
(4) Slip compensation setting
Since output
performed under General-purpose magnetic flux
vector control, the actual speed decreases by the
motor slip (during driving load operation) if the load to
the motor increases.
Set the slip compensation if you want to keep the
actual speed constant even if the load to the motor
varies. Refer to page 391 for slip compensation.
257
PARAMETER
Motor current
Torque current
Available
Inverters
E700
of General-purpose
frequency compensation
.)
D700
D700
2
—
—
is not