
Control method
141
5
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.
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.
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)
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
―
―
Advanced magnetic flux vector
control
Induction motor
Other than 9999
20
Real sensorless vector control
10 to 14
Vector control
Induction motor
0 to 6, 100 to 106
IPM/SPM motor
Other than 9999
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
―
―
Advanced magnetic flux vector
control
Induction motor
Other than 9999
20, 9999
Real sensorless vector control
10 to 14
Vector control
Induction motor
0 to 6, 100 to 106
IPM/SPM motor
0, 3, 4, 6
PM sensorless vector control
IPM/SPM motor
Other than 9999
Pr.862
Encoder option selection
RT=OFF (First motor)
RT=ON (Second motor)
0 (initial value)
Plug-in option
Control terminal option
1
Control terminal option
Plug-in option
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