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105
Selection and protection of a motor
PARAMETERS
4
4.8.3 To exhibit the best performance of the motor (offline auto tuning)
(Pr. 71, Pr. 80, Pr. 82 to Pr. 84, Pr. 90, Pr. 96)
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 162)
The motor performance can be maximized with offline auto tuning.
What is offline auto tuning?
When performing General-purpose magnetic flux vector control, the motor can be run with the optimum operating
characteristics by automatically measuring the motor constants (offline auto tuning) even when each motor constants
differs, other manufacturer's motor is used, or the wiring length is long.
Parameter
Number
Name Initial Value Setting Range Description
71 Applied motor
0
0, 1, 3, 13, 23, 40,
43, 50, 53
By selecting a standard motor or constant-
torque motor, thermal characteristic and motor
constants of each motor are set.
80 Motor capacity
9999
0.1 to 7.5kW Applied motor capacity.
9999 V/F control
82 Motor excitation current
9999
0 to 500A Set motor excitation current (no load current)
9999
Uses the Mitsubishi motor (SF-JR, SF-HR,
SF-JRCA, SF-HRCA) constants.
83 Rated motor voltage
200V class 200V
0 to 1000V Rated motor voltage (V).
400V class 400V
84 Rated motor frequency
60Hz 10 to 120Hz Rated motor frequency (Hz).
90 Motor constant (R1)
9999 0 to 50Ω, 9999
Tuning data
(The value measured by offline auto tuning is
automatically set.)
9999: Uses the Mitsubishi motor (SF-JR, SF-
HR, SF-JRCA, SF-HRCA) constants.
96
Auto tuning setting/
status
0
0 Offline auto tuning is not performed.
11
For General-purpose magnetic flux vector
control
Offline auto tuning is performed without motor
running.
(motor constant (R1) only)
21
Offline auto tuning for V/F control (automatic
restart after instantaneous power failure (with
frequency search)) (Refer to page 139)
POINT
This function is valid only when a value other than "9999" is set in Pr. 80 and General-purpose magnetic flux
vector control is selected.
You can copy the offline auto tuning data (motor constants) to another inverter with the PU (FR-PU07).
Even when motors (other manufacturer's motor, SF-JRC, etc.) other than Mitsubishi standard motor, high
efficiency motor (SF-JR, SF-HR 0.2kW or more), and Mitsubishi constant-torque motor (SF-JRCA four-pole,
SF-HRCA 0.4kW to 7.5kW) are used or the wiring length is long, using the offline auto tuning function runs the
motor with the optimum operating characteristics.
Tuning is enabled even when a load is connected to the motor.
As the motor may run slightly, fix the motor securely with a mechanical brake or make sure that there will be no
problem in safety if the motor runs (caution is required especially in elevator). Note that tuning performance is
unaffected even if the motor runs slightly.
Reading/writing/copy of motor constants (Pr. 90) tuned by offline auto tuning are enabled.
The offline auto tuning status can be monitored with the operation panel and PU (FR-PU04/FR-PU07).
Do not connect a surge voltage suppression filter (FR-ASF-H/FR-BMF-H) between the inverter and motor.