Vector Control - Mitsubishi Electric FR-A700 Technical Manual

2.7.2 Simple magnetic flux vector control [Pr. 71, 80, 90]
This control method improves the low speed torque when higher torque than V/F control is necessary in the low speed range.
Simple magnetic flux vector control can be selected by setting the capacity and type of the motor used.
[Pr. ] Name
71 Applied motor
Motor capacity
80 (Simple magnetic flux vector
control)
90 Motor constant (R1)
(1) Conditions of Simple magnetic flux vector
control
Simple 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.
The number of motor poles should be 2, 4 or 6.
(Only 4 poles for constant-torque motor. Setting
is not necessary.)
Single-motor operation (one motor run by one
inverter) should be performed.
The wiring length from inverter to motor should
be within 30m
(2) Selection method of Simple magnetic flux

vector control

Simple magnetic flux vector control is selected by
simply setting [Pr. 80 Motor capacity ≠ 9999]. When
[Pr. 80 = 9999], V/F control is selected.
When using the Mitsubishi constant torque motor, set
[Pr. 71 = 1].
Set the rated motor frequency in [Pr. 3] and rated
motor voltage in [Pr. 19] when Simple magnetic flux
vector control is selected.
When [Pr. 19] is 9999 or 8888, motor voltage is
regarded as 200V (200V class) or 400V (400V class).
Initial
Setting Range
Value
0
1
0
2
20
55K or less 0.4 to 55kW
9999 75K or more 0 to 3600kW
9999
55K or less 0 to 50Ω
9999 75K or more 0 to 400mΩ
9999
256
F700
(F700)
Thermal characteristics of a standard motor
Thermal characteristics of the Mitsubishi constant-
torque motor
Thermal characteristics of a standard motor
Adjustable 5 points V/F (Refer to page 248)
Mitsubishi standard motor (SF-JR 4P 1.5kW or less)
Set the capacity of the motor used to select Simple
magnetic flux vector control.
V/F control is performed.
Used to set the motor primary resistance value.
(Usually setting is not necessary.)
Uses the Mitsubishi motor (SF-JR, SF-HRCA) constants
(3) Motor constants setting
Although it is usually unnecessary, set the motor
primary resistance value (R1) for
90] when you need more torque under Simple
magnetic flux vector control for other manufacturer's
motor.
When the setting is 9999 (initial value), set by
referring the motor constants of the Mitsubishi motor
(SF-JR, SF-HRCA) as standard.
(4) Slip compensation setting
Since output frequency
performed under Simple 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.
PARAMETER
Description
connection in [Pr.
compensation is not