Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 530

While the motor is stopped
ON
X28 Signal OFF
Tune
Tuning status
Completed
at starting
Secondary magnetic
flux exists a few seconds
ON
OFF
Y39 signal
Y39 signal is OFF when the motor is stopped
and X28 is turned OFF. However if the
secondary magnetic flux exists after motor stop,
the signal remains ON.
OFF
Start signal
While the X28 signal is ON
ON
X28 Signal
OFF
Tuning is not performed at start since X28 signal
and Y39 signal is ON.
Tune
Tuning status
Completed
at starting
ON
OFF
Y39 signal
OFF
Start signal
Output
frequency
0Hz
NOTE
• Even if the start signal is turned ON during zero speed control or servo lock, tuning is performed at startup.
• The Y39 signal remains ON after the motor is stopped as long as the second flux remains.
• The X28 signal is disabled while the Y39 signal is ON.
• The STF and STR signals are enabled after completing tuning at start.
• The Inverter running (RUN) signal is not turned ON during online auto tuning. The RUN signal is turned ON after starting up.
• This function is disabled under V/F control or PM sensorless vector control.
• 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. Set parameters after confirming the function of each terminal.
 Magnetic flux observer (continuous tuning) (Pr.95/Pr.574 = "2")
• Performing Vector control with a motor with encoder improves the torque accuracy. Estimate or measure the flux within
the motor using the current running through the motor and the inverter output voltage. Since the flux of a motor can be
accurately estimated continuously (even during operation), optimum characteristics can be obtained without being affected
by temperature change in the second resistor.
• Under Vector control (Pr.80, Pr.81, Pr.800), select the magnetic flux observer.
NOTE
• Offline auto tuning is not necessary when magnetic flux observer is selected for SF-V5RU, SF-JR (with encoder), SF-HR (with
encoder), SF-JRCA (with encoder) or SF-HRCA (with encoder). (However, when the wiring length is long (30 m or longer as
a reference), perform offline auto tuning so that the resistance arises in the long wiring can be reflected to the operation.)
 Tuning the second motor (Pr.574)
• When one inverter switches the operation between two different motors, set the second motor in Pr.450 Second applied
motor. (In the initial setting, no second motor is applied. (Refer to
ON ON ON
Tune Tune
Completed
Completed
Secondary magnetic
flux exists a few seconds
ON ON
Tuning is not
performed if the
Y39 signal is ON.
Time
While the X28 signal is OFF
Tuning is performed at start when X28 signal is OFF
ON
(even when Y39 is ON).
X28 Signal
OFF
Tune
Tune
Tuning status
Completed
at starting
ON
Y39 signal OFF
OFF
Start signal
Output frequency
0Hz
Switching motor
Motor
First motor
switching
RT signal
ON
OFF
X28 signal
Tune
Completed
Tuning status
at starting
ON
OFF
Y39 signal
ON
Start
OFF
signal
Output
frequency
0Hz
page 505.))
Tune
Completed Completed
Secondary magnetic Secondary magnetic
flux exists a few seconds flux exists a few seconds
Second motor
First motor
Y39 turns OFF when the
driven motor is switched
ON
to the second motor
Y39 turns ON due
Secondary magnetic
to the residual second
flux exists a few seconds
magnetic flux at the
first motor.
5. PARAMETERS
5.13 (C) Motor constant parameters
1
2
3
4
Time
5
6
7
8
9
Time
10
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