Mitsubishi Electric FR-A700 Instruction Manual page 252

Control mode
Control method switching by external terminals (RT signal, X18 signal)
● The switching of the control method (V/f control, advanced magnetic flux vector control, real
sensorless vector control and vector control) by the external terminal may be made in either
of the following two ways: switching by the second function selection signal (RT), or V/f
switching signal (X18).
● Two types of control method can be switched with the RT signal by setting the type of motor
to be used as second motor in Pr. 450 "Second applied motor" and control method of the
motor in Pr. 451 "Second motor control method selection". Turn on the RT signal to select
the second function.
● For switching by the X18 signal, setting "12, 14, 16, 18, 20" in Pr. 81 "Number of motor poles"
and turning the X18 signal on switches the currently selected control method (advanced
magnetic flux vector control, real sensorless vector control and vector control) to V/f control.
In this case, electronic thermal relay characteristic, etc. can not be changed. Therefore, use
this terminal only for changing the control system of one motor. For the terminal used for
X18 signal input, set "18" in any of Pr. 178 to Pr. 189 "Input terminal function selection" to
assign the function.
First Motor Control Method
Advanced magnetic flux vector control,
Real sensorless vector control
Tab. 6-3: Control of the first and second motor
V/f control is selected when "12, 14, 16, 18, 20" is set in Pr. 81 and the X18 signal is on.
When the X18 signal is not assigned, turning the RT signal on selects V/f control as the RT
signal shares this function.
NOTES The RT signal is assigned to the terminal RT in the initial setting. By setting "3" in any of Pr.
178 to Pr. 189 "Input terminal function selection", you can assign the RT signal to the other
terminal.
The RT signal acts as the second function selection signal and makes the other second
functions valid. (Refer to section 6.14.3.)
6 - 72
V/f control
Advanced magnetic flux vector control
Same control as the first motor
Advanced magnetic flux vector control
Second Motor Control Method
(RT signal is on)
V/f control
Real sensorless vector control
V/f control
Real sensorless vector control
Parameter
Pr. 453,
Pr. 450 Pr. 451
Pr. 454
9999 — —
9999 —
≠ 9999
20, 9999
≠ 9999
10–12
9999 — —
9999 —
≠ 9999
20, 9999
≠ 9999
10–12