Mitsubishi Electric FR-A700 Series, Technical Manual

Page: 244 / 550

278
PARAMETER
(3) Magnetic flux observer (constant tuning)
[
Pr. 95 = 2
]
When exercising vector control using a motor with
encoder, it is effective for torque accuracy
improvement.
The current flowing in the motor and the inverter
output voltage are used to estimate/observe the
magnetic flux in the motor. The magnetic flux of the
motor is always (including during operation) detected
with high accuracy so that an excellent characteristic
is provided regardless of the change in the
temperature of the secondary resistance.
Set when performing constant tuning under vector
control. Even magnetic flux observer is set, magnetic
flux observer is not activated under Advanced
magnetic flux vector control. Magnetic flux observer
is always activated under Real sensorless vector
control independently of [
Pr. 95, 574 ] setting.
For the SF-V5RU, SF-JR (with encoder), SF-HR
(with encoder), SF-JRCA (with encoder) or SF-HRCA
(with encoder), it is not necessary to perform offline
auto tuning to select adaptive magnetic flux observer.
(Note that it is necessary to perform offline auto
tuning (non-rotation mode) for the wiring length
resistance to be reflected on the control when the
wiring length is long. (30m or longer as reference))
(4) Perform tuning of the second applied
motor
When you want to switch between two motors with
one inverter, set the second motor in [
Pr. 450 Second
applied motor ]. (Initial setting is without second
applied motor. (Refer to page 266))
Perform tuning using [
Pr. 574 Second motor online auto
tuning ].
[ Pr. 574 ] is valid when the RT signal is ON.
[
Pr.
] Description
51
Used as rated motor current and electronic
thermal relay parameters.
450 Applied motor
453
Motor capacity (can be used down to one rank
lower than the inverter capacity, note that the
capacity should be 0.4kW or more)
454 Number of motor poles