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Adjustment of the output torque
(current) of the motor
4.8.2
Advanced magnetic flux vector control (Pr. 71, Pr. 80, Pr. 81, Pr. 89, Pr. 450,
Pr. 451, Pr. 453, Pr. 454, Pr. 569, Pr. 800)
*1 Use Pr. 178 to Pr. 189 to assign the terminals used for the X18 and MC signal. (Refer to page 231 )
*2 Valid when Pr. 450 ≠ "9999".
Advanced magnetic flux vector control can be selected by setting the capacity, number and type of motor to be
used in Pr. 80 and Pr. 81.
What is Advanced magnetic flux vector control?
The low speed torque can be improved by providing voltage compensation to flow a motor current which meets
the load torque. Output frequency compensation (slip compensation) is made so that the motor actual speed
approximates a speed command value. Effective when load fluctuates drastically, etc.
Parameter
Number
Name
Initial
Value
Setting Range Description
71
Applied motor
0
0 to 8, 13 to 18,
20, 23, 24, 30, 33, 34, 40,
43, 44, 50, 53, 54
By selecting a standard motor or constant
torque motor, thermal characteristic and motor
constants of each motor are set.
80
Motor capacity
9999
55K or lower 0.4 to 55kW
Set the applied motor capacity.
75K or higher 0 to 3600kW
9999 V/F control
81
Number of motor poles
9999
2, 4, 6, 8, 10 Set the number of motor poles.
12, 14, 16, 18, 20 X18 signal-ON:V/F control *1
Set 10 + number
of motor poles.
9999 V/F control
89
Speed control gain
(Advanced magnetic flux
vector)
9999
0 to 200%
Motor speed fluctuation due to load fluctuation
is adjusted during Advanced magnetic flux
vector control.
100% is a referenced value.
9999 Gain matching with the motor set in Pr. 71.
450
Second applied motor
9999
0 to 8, 13 to 18,
20, 23, 24, 30, 33, 34, 40,
43, 44, 50, 53, 54
Set when using the second motor.
(same specifications as Pr. 71 )
9999 Function invalid (Pr. 71 is valid)
451 *2
Second motor control
method selection
9999
10, 11, 12 Real sensorless vector control
20, 9999
V/F control (Advanced magnetic flux vector
control)
453 *2
Second motor capacity
9999
55K or lower 0.4 to 55kW
Set the capacity of the second motor.
75K or higher 0 to 3600kW
9999 V/F control
454 *2
Number of second motor
poles
9999
2, 4, 6, 8, 10 Set the number of poles of the second motor.
9999 V/F control
569 *2
Second motor speed
control gain
9999
0 to 200%
Second motor speed fluctuation due to load
fluctuation is adjusted during Advanced
magnetic flux vector control.
100% is a referenced value.
9999 Gain matching with the motor set in Pr. 450.
800
Control method selection
20
0 to 5 Vector control
9 Vector control test operation
10, 11, 12 Real sensorless vector control
20
V/F control (Advanced magnetic flux vector control)
POINT
If the following conditions are not satisfied, select V/F control since malfunction such as insufficient torque and
uneven rotation may occur.
• The motor capacity should be equal to or one rank lower than the inverter capacity. (note that the capacity should
be 0.4kW or higher)
• Motor to be used is either Mitsubishi standard motor (SF-JR 0.4kW or higher), Mitsubishi high efficiency motor
(SF-HR 0.4kW or higher) or Mitsubishi constant torque motor (SF-JRCA 4P, SF-HRCA 0.4kW to 55kW). When
using a motor other than the above (SF-TH, other manufacturer's motors, etc.), perform offline auto tuning without
fail.
• Single-motor operation (one motor run by one inverter) should be performed.
• The wiring length from inverter to motor should be within 30m. (Perform offline auto tuning in the state where
wiring work is performed when the wiring length exceeds 30m.)
• For 75K or higher, do not use an option sine wave filter (MT-BSL/BSC) between the inverter and motor.
Magnetic flux
Magnetic flux
Magnetic flux