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Function assignment of external
terminal and control
4.10.4 Start signal selection (STF, STR, STOP signal, Pr. 250)
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 190)
(1) 2-wire type (STF, STR signal)
⋅ A two-wire type connection is shown below.
⋅ In the initial setting, the forward/reverse rotation signals (STF/STR) are used as start and stop signals. Turn ON
either of the forward and reverse rotation signals to start the motor in the corresponding direction. If both are turned
OFF (or ON) during operation, the inverter decelerates to a stop.
⋅ The speed setting signal may either be given by entering 0 to 10VDC across the speed setting input terminal 2 and
5, by setting the required values in Pr. 4 to Pr. 6 Multi-speed setting (high, middle, low speeds), etc. (For multi-speed
operation, refer to page 93)
⋅ When Pr. 250 is set in any of "1000 to 1100, 8888", the STF signal becomes a start command and the STR signal a
forward/reverse command.
You can select the operation of the start signal (STF/STR).
Used to select the stopping method (deceleration to a stop or coasting) when the start signal turns OFF.
Used to stop the motor with a mechanical brake, etc. together with switching OFF of the start signal.
(Refer to page 119 for stop selection)
Parameter
Number
Name
Initial
Value
Setting
Range
Description
Start Signal (STF/STR)
Stop Operation
(Refer to page 119)
250 Stop selection 9999
0 to 100s
STF signal: Forward rotation
start
STR signal: Reverse rotation
start
The motor is coasted to a stop
when the preset time elapses
after the start signal is turned
OFF. When the setting is any
of 1000s to 1100s, the inverter
coasts to a stop in (Pr. 250 -
1000)s.
1000s to
1100s
STF signal: Start signal
STR signal: Forward/reverse
rotation signal
9999
STF signal: Forward rotation
start
STR signal: Reverse rotation
start
When the start signal is turned
OFF, the motor decelerates to
stop.
8888
STF signal: Start signal
STR signal: Forward/reverse
rotation signal
2-wire connection example (Pr. 250 = "9999")
2-wire connection example (Pr. 250 = "8888")
REMARKS
⋅ When Pr. 250 is set in any of "0 to 100, 1000 to 1100", the motor coasts to a stop if the start command is turned OFF. (Refer to
page 119)
⋅ The STF and STR signals are assigned to the STF and STR terminals in the initial setting. The STF signal can be assigned to
Pr. 178 STF terminal function selection and the STR signal to Pr. 179 STR terminal function selection only.
Forward
rotation start
Reverse
rotation start
STF
ON
Time
STF
STR
Inverter
Output frequency
ON
STR
10
2
5
Forward
rotation
Reverse
rotation
SD
Start signal
Forward/
reverse
signal
STF
Tim
e
STF
STR
Inverter
Output frequency
STR
10
2
5
Forward
rotation
Reverse
rotation
ON
ON
SD