120
Function assignment of external
terminal and control
4.10.3 Condition selection of function validity by the second function selection
signal (RT) (RT signal, Pr. 155)
When the RT signal turns ON, the second function becomes valid.
The second function has the following applications.
(a) Switching between normal use and emergency use
(b) Switching between heavy load and light load
(c) Changing of acceleration/deceleration time by broken line acceleration/deceleration
(d) Switching of characteristic between main motor and sub motor
When the RT signal is ON, the following second functions are selected at the same time.
You can select the second function using the external terminal (RT signal).
You can also set the RT signal operation condition (reflection time).
Parameter
Number
Name Initial Value Setting Range Description
155
RT signal function validity
condition selection
0
0
Second function is immediately valid with ON of the
RT signal.
10
Second function is valid only during the RT signal is
ON and constant speed operation.
(invalid during acceleration/deceleration)
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 185)
Second function
connection diagram
Second acceleration/deceleration time example
Function
First Function Parameter
Number
Second Function
Parameter Number
Refer to
Page
Torque boost Pr. 0 Pr. 46 71
Base Frequency Pr. 3 Pr. 47 82
Acceleration time Pr. 7 Pr. 44 94
Deceleration time Pr. 8 Pr. 44, Pr. 45 94
Electronic thermal relay function Pr. 9 Pr. 51 100
Stall prevention Pr. 22 Pr. 48, Pr. 49 74
Output frequency detection Pr. 42(Pr. 43) Pr. 50 128
PID control
Pr. 127 to Pr. 130, Pr. 133,
Pr. 134, Pr. 760 to Pr. 764
Pr. 753 to Pr. 758,
Pr. 765 to Pr. 769
256
REMARKS
The RT signal is assigned to the RT terminal in the initial setting. By setting "3" in any of Pr. 178 to Pr. 189 (input terminal function
selection), the RT signal can be assigned to the other terminal.
CAUTION
Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Please
set parameters after confirming the function of each terminal.
Parameters referred to
Pr. 178 to Pr.189 (input terminal function selection) Refer to page 117
STF(STR)
Inverter
Start
Second
function
selection
RT
High speed
RH
Middle speed
RM
PC
(initial value)
RT
Output frequency
Setting value "0"
RH
RM
Acceleration
time is reflected
Time
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