Mitsubishi Electric FR-A700 Technical Manual page 228

(3) Instructions on Real sensorless vector
control
Make sure to perform offline auto tuning before
performing Real sensorless vector control.
The carrier frequencies are selectable from 2k,
6k, 10k, 14kHz for Real sensorless vector
control. (2k and 6kHz for the 75K or more)
Torque control cannot be performed in the low
speed (about 10Hz or less) regeneration range or
light load at low speed (about 20% or less of
rated torque at about 5Hz or less). Choose vector
control.
Performing pre-excitation (LX signal and X13
signal) under torque control may start the motor
running at a low speed even when the start signal
(STF or STR) is not input. The motor may run
also at a low speed when the speed limit value =
0 with a start command input. Perform pre-
excitation after making sure that there will be no
problem in safety if the motor runs.
Do not switch between the forward rotation
command (STF) and reverse rotation command
(STR) during operation under torque control.
Overcurrent trip (E.OC1 to 3) or opposite rotation
deceleration fault (E.11) occurs.
For the 0.4K to 3.7K, the speed deviation may
become large at 20Hz or less and torque may
become insufficient in the low speed range under
11Hz during continuous operation under Real
sensorless vector control. In such case, stop
operation once and reaccelerate to solve the
problems.
When the inverter is likely to start during motor
coasting under Real sensorless vector control,
set to make frequency search of automatic
restart after instantaneous power failure valid
([Pr. 57 9999], [Pr. 162 = 10]).
(4) Performing Real sensorless vector control
by switching between two motors
Turning the RT signal ON allows the second motor to
be controlled.
Set the second motor in [Pr. 450 Second applied motor].
(Initial setting is 9999 (without second applied motor).
Refer to page 266. )
RT Signal is ON
Functions
(Second Motor)
Applied motor
Motor capacity
Number of motor
poles
Speed control
gain
Control method
selection
262
PARAMETER
RT Signal is OFF
(First Motor)
[Pr. 450] [Pr. 71]
[Pr. 453] [Pr. 80]
[Pr. 454] [Pr. 81]
[Pr. 569] [Pr. 89]
[Pr. 451] [Pr. 800]