Mitsubishi Electric FR-A700 Instruction Manual page 158

Adjust the output torque of the motor (current)
CAUTION
· Uneven rotation slightly increases as compared to the V/F control. (It is not suitable for machines such as grinding machine and
wrapping machine which requires less uneven rotation at low speed.)
· When a surge voltage suppression filter (FR-ASF-H) is connected between the inverter and motor, output torque may decrease.
(FR-A720-02150 (FR-A740-01100) or less)
· When terminal assignment is changed using Pr. 178 to Pr. 189 (input terminal function selection), the other functions may be
affected. Make setting after confirming the function of each terminal.
(2) Adjust the motor speed fluctuation at load fluctuation (speed control gain)
The motor speed fluctuation at load fluctuation can be adjusted using Pr. 89.
(It is useful when the speed command does not match the motor speed after
the FR-A500(L) series inverter is replaced with the FR-A700 series inverter,
etc.)
(3) Advanced magnetic flux vector control is performed with two motors
• Turning the RT signal on allows the second motor to be controled.
• Set the second motor in Pr. 450 Second applied motor. (Initial setting is "9999" (without second applied motor). Refer
to page 185.)
Function
Applied motor
Motor capacity
Number of motor
poles
Speed control gain
Control method
selection
REMARKS
• The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 232)
The RT signal is assigned to the terminal RT in the initial setting. By setting "3" in any of Pr. 178 to Pr. 189 (input terminal function
selection), the RT signal can be assigned to the other terminal.
CAUTION
• Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Please
make setting after confirming the function of each terminal.
♦Parameters referred to♦
Pr. 71, Pr. 450 Applied motor
Pr. 800, Pr. 451 Control method selection
148
RT signal ON (second motor)
Pr. 450
Pr. 453
Pr. 454
Pr. 569
Pr. 451
Refer to page 185
Refer to page 92
RT signal OFF (first motor)
Pr. 71
Pr. 80
Pr. 81
Pr. 89
Pr. 800
Speed