Mitsubishi FR-A740-00023-EC Instruction Manual page 202

Selection and protection of a motor
(2) Magnetic flux observer (normal tuning) (setting value is "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 detected with high accuracy so that an excellent characteristic is provided
regardless of the change in the temperature of the secondary resistance.
· Vector control (Pr. 80, Pr. 81, Pr. 800) should be selected. (Refer to page 87.)
CAUTION
· For the 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).
REMARKS
· Online auto tuning does not operate if the MRS signal is input, if the preset speed is less than the Pr. 13 Starting frequency (V/F
control or advanced magnetic flux vector control), or if the starting conditions of the inverter are not satisfied, e.g. inverter error.
· Online auto tuning does not operate during deceleration or at a restart during DC brake operation.
· Invalid for jog operation.
· Automatic restart after instantaneous power failure overrides when automatic restart after instantaneous power failure is selected.
(Start-time online auto tuning is not performed at frequency search.)
Perform online auto tuning at a stop with the X28 signal when using automatic restart after instantaneous power failure together.
(Refer to the following for details.)
· Zero current detection and output current detection are valid during online auto tuning.
· The RUN signal is not output during online auto tuning. The RUN signal turns on at a start.
· If the period from an inverter stop to a restart is within 4s, start-time tuning is performed but the tuning results are not reflected.
(3) Start-time online auto tuning from external terminal (X28 signal, Y39 signal)
(Hz)
ON
X28signal
Tuning status Completion
at starting
Tune
Y39signal
Start signal
REMARKS
· Start-time tuning is performed when the start signal is turned on during zero speed control also.
· The Y39 signal is in on status while secondary magnetic flux exists after the motor stop.
· While the Y39 signal is on, the X28 signal is not valid.
· The STF, STR signals are valid after completion of the start-time tuning.
· Only the output signals below are valid during tuning.
IPF, THP, PU, Y12, RY, ER, LF, MT, CA, AM, A1, B1, C1, A2, B2, C2
· Tuning is invalid during V/F control.
CAUTION
· Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) or Pr. 190 to Pr. 196 (output terminal
function selection) may affect the other functions. Make setting after confirming the function of each terminal.
192
· By turning on the start-time tuning signal (X28) before the
start signal (STF or STR) turns on (at a stop), online tuning
is performed and a starting delay after start signal turns on
due to tuning can be avoided.
· Perform offline auto tuning and set "1" (start-time tuning) in
Pr. 95.
· When the start-time tuning completion signal (Y39) is off,
Time
start-time tuning with the X28 signal is performed.
· Start-time tuning ends within 500ms maximum.
· When using the X28 signal, set "28" in Pr. 178 to Pr. 189
(input terminal function selection) and assign functions to the
input terminal.
· When using the Y39 signal, set "39 (positive logic) or 139
(negative logic)" in Pr. 190 to Pr. 196 (output terminal function
selection) and assign functions to the output terminal.