Mitsubishi Electric FR-F820-00077 Instruction Manual page 216

Control method
Changing the control method with external terminals (RT signal, X18 signal)
● Control method (V/F control, Advanced magnetic flux vector control can be switched among
using external terminals.
The control method can be either switched using the Second function selection (RT) signal or the
V/F switchover (X18) signal.
● When using the RT signal, set the second motor in Pr. 450 "Second applied motor". Turning ON
the RT signal enables the second function, enabling the switchover of the control method.
● When using the X18 signal, turning ON the X18 signal switches the presently-selected control
method (Advanced magnetic flux vector control) to the V/F control. At this time, the second
functions including electronic thermal characteristic are not changed. Use this method to switch
the control method for one motor. (To switch the second functions, use the RT signal.)
To input the X18 signal, set "18" in any of Pr. 178 to Pr. 189 (input terminal function selection) to
assign the function.
First motor control method
V/F control
Advanced magnetic flux
vector control
PM motor control
Tab. 5-17:
V/F control is set by turning ON the X18 signal. If the X18 signal is unassigned, RT signal performs
the same function; Turning ON the RT signal selects V/F control.
V/F control when Pr. 453 or Pr. 454 is set to "9999". When Pr. 450 is set to the IPM motor MM-EFS or
MM-THE4, PM motor control is enabled even if Pr. 453 ≠ "9999" or Pr. 454 = "9999".
NOTES RT signal is assigned to the terminal RT in the initial status. Set "3" in one of Pr. 178 to Pr. 189 (input
terminal function selection) to assign the RT signal to another terminal.
The RT signal is a second function selection signal. The RT signal also enables other second func-
tions. (Refer to page 5-291.)
The control method could be changed by external terminals (RT signal, X18 signal) while the
inverter is stopped. If a signal is switched during the operation, the control method changes after
the inverter stops.
Parameters referred to
Pr. 178 to Pr. 189
Pr. 450
5 - 44
Second motor control
method (RT signal-ON)
V/F control
Advanced magnetic flux
vector control
PM motor control
Same control as the first
motor
V/F control
Advanced magnetic flux
vector control
PM motor control
Control of the first and second motor
(input terminal function selection)
Second applied motor
Pr. 450 setting value Pr. 453, Pr. 454 setting value
9999
⎯
Induction motor
IPM/SPM motor
9999
⎯
Induction motor
IPM/SPM motor
=>
=>
Parameters
⎯
9999
Other than 9999
⎯
9999
Other than 9999
page 5-285
page 5-297