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Function assignment of external
terminal and control
4
PARAMETERS
4.11.3 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 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 201)
Second function
connection diagram
Second acceleration/deceleration time example
Function
First Function
Parameter Number
Second Function
Parameter Number
Applied control mode
({: Valid, ⎯: Invalid)
Refer to
Page
Torque boost Pr. 0 Pr. 46 ⎯⎯87
Base frequency Pr. 3 Pr. 47 ⎯ 98
Acceleration time Pr. 7 Pr. 44 109
Deceleration time Pr. 8 Pr. 44, Pr. 45 109
Electronic thermal
relay function
Pr. 9 Pr. 51 ⎯ 117
Stall prevention Pr. 22 Pr. 48, Pr. 49 91
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. Set
parameters after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 178 to Pr.189 (input terminal function selection) Refer to page 133
STF/STR
Inverter
Start
Second
function
selection
RT
High speed
RH
Middle speed
RM
SD
(initial value)
RT
Output frequency
Setting value "0"
RH
RM
Acceleration
time is reflected
Time
V/F
V/F
V/F
S
MFVC
S
MFVC
S
MFVC
IPM
IPM
IPM