Mitsubishi FR-A800

Control method
168
PARAMETERS
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.
 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".
NOTE
• 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 functions. (Refer to page 434.)
• 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.
First motor control method
Second motor control method
(RT signal-ON)
Pr.450
setting value
Pr.453, Pr.454
setting value
Pr.451
setting value
V/F control
V/F control
9999 
9999
 9999
 
Advanced magnetic flux vector
control
Induction motor
Other than 9999
20
Real sensorless vector control 10 to 14
PM sensorless vector control IPM/SPM motor Other than 9999
Advanced magnetic flux vector
control
Real sensorless vector control
Vector control
PM sensorless vector control

Same control as the first motor 9999 
V/F control  9999
 
Advanced magnetic flux vector
control
Induction motor
Other than 9999
20, 9999
Real sensorless vector control 10 to 14
PM sensorless vector control IPM/SPM motor Other than 9999