Mitsubishi Electric FR-A820-00046 Instruction Manual page 244

Control method
NOTES 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 func-
tions. (Refer to page 5-428.)
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 plug-in option (FR-A8AP/FR-A8APR) 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/sec-
ond), plug-in option, and control terminal option.
Pr. 862
Encoder option selection
0 (initial value)
1
Tab. 5-21:
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.)
5 - 64
RT = OFF (First motor)
Plug-in option
Control terminal option
Parameter 862 function
Parameters
RT = ON (Second motor)
Control terminal option
Plug-in option