Mitsubishi Electric FR-F820-04750 Instruction Manual page 678

(G) Control parameters
Setting multiple torque boosts (RT signal, Pr. 46)
● When changing the torque boost depending on the usage or when using single inverter switching
between multiple motors, use the second torque boost.
● Pr. 46 "Second torque boost" will become enabled when the RT signal turns ON.
NOTES The RT signal acts as the second function selection signal and makes the other second functions
valid. (Refer to page 5-285.)
The RT signal is assigned to the terminal RT in the initial status. Set "3" in any of Pr. 178 to Pr. 189
(input terminal function selection) to assign the RT signal to another terminal.
Set a larger value when the distance between the inverter and the motor is long or when there is
not enough motor torque in the low-speed range. It may cause overcurrent trip when it is set too
large.
Setting for Pr. 0, and Pr. 46 becomes enabled only when the V/F control is selected.
When the initial value is set in Pr. 0, the Pr. 0 setting is automatically changed by changing the
Pr. 71 "Applied motor", Pr. 81 "Number of motor poles" setting. (Refer to page 5-291.)
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. 3
Pr. 19
Pr. 71
Pr. 178 to Pr. 182
5 - 516
Base frequency
Base frequency voltage
Applied motor
(input terminal function selection)
Parameters
=> page 5-517
=> page 5-517
=> page 5-291
=> page 5-279