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Acquiring Large Starting Torque And Low Speed Torque (general-purpose Magnetic Flux Vector Control (pr. 71, Pr. 80)) - Mitsubishi Electric FR-F700PJ Instruction Manual

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4.4.2
Acquiring large starting torque and low speed torque (General-purpose magnetic
flux vector control (Pr. 71, Pr. 80))
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.
Parameter
Name
Number
71
Applied motor
80
Motor capacity
The above parameters can be set when
....Specifications differ according to the date assembled. Refer to page 346 to check the SERIAL number.
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.
 Motor to be used is any of Mitsubishi standard motor (SF-JR 0.4kW or higher), high efficiency motor (SF-HR
0.4kW or higher) or Mitsubishi constant-torque motor (SF-JRCA 4P, SF-HRCA 0.4kW to 15kW). 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 the General-purpose magnetic flux control are available to drive general-purpose motors
(three-phase induction motors) with this inverter.
IPM motor control is available to drive an IPM motor. (Refer to page 83)
 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.
Adjustment of the output torque (current) of the motor
GP
GP
GP
Initial
Setting Range
Value
0, 1, 3, 13, 23, 40, 43
0
50, 53, 120, 210
0.4 to 15kW
9999
9999
Pr. 160 Extended function display selection =
MFVC
MFVC
MFVC
By selecting a standard motor or constant-torque motor,
thermal characteristic and motor constants of each motor
are set.
Applied motor capacity. (General-purpose magnetic flux
vector control)
V/F control
(Refer to page 197)
"0".
Description
4
93

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