21.
SELECTING GENERAL-PURPOSE MAGNETIC FLUX VECTOR CONTROL
The general-purpose magnetic flux vector control can be selected by setting the motor capacity
and
type
of motor.
The general-purpose magnetic flux vector control is effective for applications where greater start-
ing torque or more than
VF
mode
torque at low speed is required. or the load is varying.
(1) Conditions for selecting the general-purpose magnetic flux vector control
The general-purpose magnetic flux vector control can be effectively used only when the foi-
lowing conditions are satisfied. If
the
general-purpose magnetic flux vector control is selected
while any of these conditions is not satisfied, it will cause insufficient torque, irregular rotation,
and other problems. In which
case,
VF
control
should
be
selected.
Conditions
*The motor capacity is either equivalent to or *The number of poles is
2,
4, or 6. (It is not
one rank below the inverter capacity. necessary to set the number of poles. For
*The motor type is Mitsubishi standard motor constant torque motors, 4
poles
only)
(0.1
kW
(1/8HP) or larger, 200V class; *The motor is controlled by its own inverter.
0.2kW (1/4HP) or larger 400V class), Mit- OWinng distance between the motor and the
subishl constant torque motor (SF-JRC, inverter is within 30m (98.46 feet).
If
the dis-
200V
class, 4
poles,
0.4 (1/2HP) to 3.7kW tance exceeds 30m (98.46 feet), refer to
(5HP)) or MlTSUBlSHl equivalent.
MITSUBISHI.
(2)
Selecting the general-purpose magnetic flux vector control
...
Set the motor capacity (other
than “9999”; “9999”
calls
for the V/F control.) for Pr.80 (motor capacity). If a Mitsubishi con-
stant torque motor is
used,
set ‘1” for Pr.71 (applicable motor).
Note: Cautlonr on general-purpose magnetk
flux
vector
control
(1) Irregular rotation of the motor will be a little more apparent than in the
V/F
control.
(2) At the start, 0.1 to 0.2 second delay is generated due to control data calculation.
(3) If this control is selected, the following parameter settings will be ignored. (Pr.0, Pr.3,
Pr.14, Pr.19, Pr.46, Pr.47)
Applications for which the general-purpose magnetic flux vector control is recommended
*The machine which requires greater start- *The machine in which torque variation is
*The machine which requires more than
V/F
(This control is not recommended for machines, such as grinders and lapping machines, which
requires low irregularity at
speed
control at low-speed operation.)
ing torque excessive
mode torque at low-speed.
-53-
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