70
Adjust the output torque (current) of the motor
4.3.2
General-purpose magnetic flux vector control (Pr. 71, Pr. 80)
(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.)
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 so that the motor current which meets the
load torque to flow. 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
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. (general-purpose magnetic flux
vector control)
9999
V/F control
The above parameters can be set when
Pr. 160 Extended function display selection = "0".(Refer to page 157)
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 more)
Motor to be used is any of Mitsubishi standard motor, high efficiency motor (SF-JR, SF-HR 0.2kW or more) or
Mitsubishi constant torque motor (SF-JRCA four-pole, SF-HRCA 0.4kW to 7.5kW). 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).
for the permissible wiring length.
GP MFVC
GP MFVC
GP MFVC
Summary of Contents for FR-D700 Series
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