Acquiring Large Starting Torque And Low Speed Torque (General-Purpose Magnetic Flux Vector Control (Pr. 71, Pr. 80, Pr. 83, Pr. 84)) - Mitsubishi Electric FR-D720 K Series Instruction Manual

Adjustment of the output torque (current) of the motor
4.3.2 Acquiring large starting torque and low speed torque (General-purpose magnetic
flux vector control (Pr. 71, Pr. 80, Pr. 83, Pr. 84))
General-purpose magnetic flux vector control is available.
Large starting torque and low speed torque are available with General-purpose magnetic flux vector control.
 What is General-purpose 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. With setting slip compensation (Pr. 245 to Pr. 247), output frequency compensation (slip compensation) is
made so that the actual motor speed goes closer to a speed command value. Effective when load fluctuates
drastically, etc.
General-purpose magnetic flux vector control is the same function as the FR-E500 series.
Parameter
Name
Number
71 Applied motor
80 Motor capacity
83 Rated motor voltage
84 Rated motor frequency
The above parameters can be set when
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 0.1kW or higher).
 Motor to be used is any of Mitsubishi Electric standard motor (SF-JR 0.2kW or higher), Mitsubishi Electric high
efficiency motor (SF-HR 0.2kW or higher),Mitsubishi Electric constant-torque motor (SF-JRCA 4P, SF-HRCA
0.2kW to 15kW) or Mitsubishi Electric high-performance energy-saving motor (SF-PR). When using a motor
other than the above (other manufacturer's motor), 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.)
Permissible wiring length between inverter and motor differs according to the inverter capacity and setting value
of Pr. 72 PWM frequency selection (carrier frequency). Refer to page 19 for the permissible wiring length.
(1) Control mode
 V/F control (initial setting) and General-purpose magnetic flux vector control are available with this inverter.
 V/F control is for controlling frequency and voltage so that the ratio of frequency (F) to voltage (V) is constant when
changing frequency.
 General-purpose magnetic flux vector control divides the inverter output current into an excitation current and a torque
current by vector calculation, and makes voltage compensation to flow a motor current which meets the load torque.
(General-purpose magnetic flux vector control is the same function as the FR-E500 series.)
78
Initial Value
0
9999
100V class,
200V
200V class
400V class 400V
60Hz
Pr. 160 Extended function display selection
GP MFVC GP MFVC GP MFVC
Setting Range
By selecting a standard motor or constant-
0, 1, 3, 13, 23,
torque motor, thermal characteristic and motor
40, 43, 50, 53
constants of each motor are set.
Applied motor capacity. (General-purpose
0.1 to 15kW
magnetic flux vector control)
9999 V/F control
0 to 1000V Rated motor voltage (V).
10 to 120Hz Rated motor frequency (Hz).
(Refer to page 165.)
= "0".
Description