Mitsubishi Electric 800 Series Instruction Manual page 142

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

V/F control is set by turning ON the X18 signal.

V/F control when Pr.453 or Pr.454 is set to "9999" regardless of the Pr.451 setting.
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
• 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.
Switching between two encoder-equipped motors (Pr.862)
• Using the Vector control compatible plug-in options together with the control terminal option (FR-A8TP) enables the Vector
control operation by switching between two encoder-equipped motors according to the RT signal. Use Pr.862 Encoder
option selection to set the combination of the motors (first/second), plug-in option, and control terminal option.
Pr.862
Encoder option selection
0 (initial value)
1

When Pr.450 Second applied motor = "9999", the first motor is selected even if the RT signal turns ON.
NOTE
• Pr.862 setting is valid even when either one of the plug-in option or control terminal option is installed. For using the control
terminal option alone, the motor does not run when Pr.862 is the initial value as it is. (When the RT signal is OFF)
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
RT=OFF (First motor)
Plug-in option
Control terminal option
Pr.450 Pr.453, Pr.454
setting 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
RT=ON (Second motor)
Control terminal option
Plug-in option
Control method
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
0, 3, 4, 6
Other than 9999
page

141
PARAMETERS
419.)
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