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Mitsubishi Electric FR-F740-00023 Instruction Manual: Condition Selection Of Function Validity By The Second Function Selection Signal (rt) (rt Signal Pr. 155)

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4.10.3 Condition selection of function validity by the second function selection signal
(RT) (RT signal, Pr. 155)
You can select the second function using the external terminal (RT signal).
You can also set the RT signal operation condition (reflection time).
Parameter
Name
Number
RT signal function validity
155
condition selection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 173)
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
Second function
connection diagram
Inverter
Start
STF(STR)
Second
function
RT
selection
RH
High speed
RM
Middle speed
PC
Functions that can be set as second functions
Function
Torque boost
Base Frequency
Acceleration time
Deceleration time
Electronic thermal relay function
Stall prevention
Output frequency detection
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.
When the RT signal is on, the other functions such as the second acceleration/deceleration time are also selected.
CAUTION
Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Please
make setting after confirming the function of each terminal.
Parameters referred to
Pr. 178 to Pr.189 (input terminal function selection)
Initial Value
Setting Range
0
10
Second acceleration/deceleration time example
Setting value "0"
(initial value)
Acceleration
time is reflected
RT
RH
RM
First Function
Second Function
Parameter Number
Parameter Number
Pr. 0
Pr. 3
Pr. 7
Pr. 8
Pr. 44, Pr. 45
Pr. 9
Pr. 22
Pr. 48, Pr. 49
Pr. 42(Pr. 43)
Refer to page 110
Function assignment of external
Second function is immediately valid with on of the
0
RT signal.
Second function is valid only during the RT siganl is
on and constant speed operation.
(invalid during acceleration/deceleration)
Time
Refer to
Page
Pr. 46
67
Pr. 47
78
Pr. 44
90
90
Pr. 51
95
70
Pr. 50
120
terminal and control
Description
113
4

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