Mitsubishi Electric FR-A820-00046 Instruction Manual page 270

Control method
Changing the control method with external terminals (RT signal, X18 signal)
● Control method (V/F control, Advanced magnetic flux vector control, Real sensorless vector
control, 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" and set the
second motor's control method in Pr. 451 "Second motor control method selection". 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, Real sensorless vector control, 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
Real sensorless vector control
Vector control
PM sensorless vector control
Tab. 5-20:
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" regardless of the Pr. 451 setting. When Pr. 450 is
set to the IPM motor MM-CF, PM sensorless vector control is enabled even if Pr. 453 ≠ "9999" or
Pr. 454 = "9999".
5 - 68
Second motor control
method (RT signal-ON)
V/F control
Advanced magnetic flux
vector control
Real sensorless vector control
Vector control
PM sensorless vector control
Same control as the first
motor
V/F control
Advanced magnetic flux
vector control
Real sensorless vector control
Vector control
PM sensorless vector control
Control of the first and second motor
Pr. 450 setting Pr. 453, Pr. 454
value setting value
⎯
9999
⎯ ⎯
⎯
9999
Induction motor
Other than 9999
Induction motor
IPM/SPM motor
IPM/SPM motor
⎯
9999
⎯
9999
Induction motor
Other than 9999
Induction motor
IPM/SPM motor
IPM/SPM motor
Parameters
Pr. 451 setting
value
⎯
9999
⎯
20
10 to 14
0 to 6, 100 to 106
Other than 9999
Other than 9999
⎯
⎯
20, 9999
10 to 14
0 to 6, 100 to 106
Other than 9999
Other than 9999