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Adjustment of the output torque
(current) of the motor
(2) Adjust the motor speed fluctuation at load fluctuation (speed control gain)
(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.)
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.
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.)
Function RT signal ON (second motor) RT signal OFF (first motor)
Applied motor Pr. 450 Pr. 71
Motor capacity Pr. 453 Pr. 80
Number of motor
poles
Pr. 454 Pr. 81
Speed control gain Pr. 569 Pr. 89
Control method
selection
Pr. 451 Pr. 800
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 Refer to page 187
Pr. 800, Pr. 451 Control method selection Refer to page 92
Load torque
Speed