Mitsubishi Electric FR-A700 Instruction Manual page 333

Parameter
NOTES 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. (01800 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.
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.)
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 setting is "9999" (without
second applied motor). Refer to section 6.12.2.)
Function
Applied motor
Motor capacity
Number of motor poles
Speed control gain
Control method selection
Tab. 6-28: Switching the parameters by using the RT signal
NOTES
The RT signal acts as the second function selection signal and makes the other second
functions valid. (Refer to section 6.14.3.)
The RT signal is assigned to the RT terminal in the default setting. By setting "3" in any of
Pr. 178 to Pr. 189 "Input terminal function selection", you can assign the RT signal to the
other terminal.
Changing the terminal assignment using Pr. 178 to Pr. 189 "Input terminal function selec-
tion" may affect the other functions. Please make setting after confirming the function of
each terminal.
FR-A700 EC
Speed
RT signal ON (second motor)
Pr. 450
Pr. 453
Pr. 454
Pr. 569
Pr. 451
Adjust the output torque of the motor (current)
Fig. 6-47:
Adjusting speed fluctuations
RT signal OFF (first motor)
Pr. 71
Pr. 80
Pr. 81
Pr. 89
Pr. 800
I001544E
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