Large Starting Torque And Low Speed Torque Are Necessary (Advanced Magnetic Flux Vector Control, Real Sensorless Vector Control) - Mitsubishi Electric FR-A700 Instruction Manual

Basic settings
5.1.7 Large starting torque and low speed torque are necessary (advanced
magnetic flux vector control, real sensorless vector control) (Pr. 9, Pr. 71,
Pr. 80, Pr. 81, Pr. 800)
Advanced magnetic flux vector control can be selected by setting the capacity, poles and type
of the motor used in Pr. 80 and Pr. 81. When higher accuracy and fast response control is nec-
essary, select the real sensorless vector control and perform offline auto tuning and online auto
tuning.
● What is advanced 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. Output frequency compensation (slip compen-
sation) is made so that the motor actual speed approximates a speed command value.
Effective when load fluctuates drastically, etc.
● What is real sensorless vector control?
This function enables vector control with a general-purpose motor without encoder. It is
suitable for applications below.
– To minimize the speed fluctuation even at a severe load fluctuation
– To generate low speed torque
– To perform torque control
Pr.
Name
No.
Electronic thermal
9
O/L relay
71
Applied motor
80
Motor capacity
Number of motor
81
poles
Control method
800
selection
The initial value of the 00023 and 00038 is set to 85% of the rated inverter current.
Use Pr. 178 to Pr. 189 to assign the terminals used for the X18 and MC signal.
FR-A700 EC
Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless
Initial Value Setting Range
01800 or
Inverter
0–500A
less
rated
output
02160 or
0–3600A
current
more
0–8/13–18/20/23/24/30/33/
0
34/40/43/44/50/53/54
01800 or
0.4–55kW
less
9999 02160 or
0–3600kW
more
9999
2/4/6/8/10
9999 12/14/16/18/20
9999
0–5
9
10
20
11
12
20
Simple mode parameter list
Description
Set the rated motor current.
By selecting a standard motor or constant-torque
motor, thermal characteristic and motor constants of
each motor are set.
Set the applied motor capacity.
V/f control
Set the number of motor poles.
X18 signal-ON: Set 10 + number of motor
V/f control poles.
V/f control
Vector control (Refer to page 5-18.)
Vector control test operation
Speed control
Real sensorless vector
Torque control
control
MC signal-ON: torque
MC signal-OFF: speed
V/f control (advanced magnetic flux vector control)
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