Mitsubishi Electric FR-D720S SC EC Instruction Manual page 120

Simple mode parameter list
5.1.7 Large starting torque and low speed torque are necessary
(General-purpose magnetic flux vector control) (Pr. 9, Pr. 71, Pr. 80)
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 cur-
rent which meets the load torque. With setting slip compensation (Pr. 245 to Pr. 247), output fre-
quency 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 of FR-D700 SC series is the same function as the
FR-E500 series.
Pr.
Name
No.
Electronic thermal
9
O/L relay
71
Applied motor
80
Motor capacity
The above parameters can be set when Pr. 160 = 0.
Refer to appendix A for the rated inverter output current.
NOTES 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. (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 0.2kW to 7.5kW). When using a motor other than the above (other manufactu-
rer'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. Otherwise, the drive beha-
viour may be impaired or the offline auto tuning may be cancelled and an appropriate alarm
issued. Perform offline auto tuning in the state where wiring work is performed when the wir-
ing length exceeds 30m.
Permissible wiring length between inverter and motor differs according to the inverter capac-
ity and setting value of Pr. 72 "PWM frequency selection" (carrier frequency). (Refer to page
3-11).
5 - 12
Initial
Setting Range
Value
Rated
0–500A
current
0 0/1/3/13/23/40/43/50/53
0.1–7.5kW
9999
9999
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
Basic settings
GP MFVC GP MFVC GP MFVC