Mitsubishi Electric FR-A720-0.4K Instruction Manual page 161

Adjustment of the output torque
(current) of the motor
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/FR-BMF-H) is connected between the inverter and motor, output torque
may decrease. (55K or lower)
· When terminal assignment is changed using Pr. 178 to Pr. 189 (input terminal function selection), the other functions may be
affected. Set parameters 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 controlled.
• Set the second motor in Pr. 450 Second applied motor. (Initial value is "9999" (without second applied motor). Refer to
page 187.)
Function RT signal ON (second motor)
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 235)
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. Set
parameters after confirming the function of each terminal.
♦Parameters referred to♦
Pr. 71, Pr. 450 Applied motor
Pr. 800, Pr. 451 Control method selection
150
Pr. 450
Pr. 453
Pr. 454
Pr. 569
Pr. 451
Refer to page 187
Refer to page 92
RT signal OFF (first motor)
Pr. 71
Pr. 80
Pr. 81
Pr. 89
Pr. 800
Speed