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Function assignment of external terminal and control
4.10.4 Start signal operation selection (STF, STR, STOP signal, Pr. 250)
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 112 for stop selection)
Parameter
Initial
Name
Setting Range
Number
Value
Stop
1000s to 1100s
250
9999
selection
The above parameter can be set when Pr. 160 Extended function display selection = "0". (Refer to page 162)
(1)
Two-wire type connection (STF, STR signal)
The two-wire 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. Switch both OFF (or both ON)
the start signal during operation to decelerate the inverter to a stop.
The speed setting signal may either be given by entering 0 to 10VDC across the speed setting input terminal 2-5, or 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 89.)
When Pr. 250 is set to any of "1000 to 1100, 8888", the STF signal becomes a start command and the STR signal a
forward/reverse command.
STF
Forward rotation start
Inverter
STR
Reverse rotation start
SD
10
2
5
Forward
rotation
Reverse
rotation
ON
STF
ON
STR
2-wire connection example (Pr. 250 = "9999")
REMARKS
When Pr. 250 is set to any of "0 to 100, 1000 to 1100", turning off the start command coasts the inverter to a stop. (Refer to page 112)
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.
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Description
Start signal
(STF/STR)
STF signal: Forward rotation start
0 to 100s
STR signal: Reverse rotation start
STF signal: Start signal
STR signal: Forward/reverse signal
STF signal: Forward rotation start
9999
STR signal: Reverse rotation start
STF signal: Start signal
8888
STR signal: Forward/reverse signal
Start signal
Forward/reverse
signal
Forward
rotation
Time
Reverse
rotation
ON
STF
STR
2-wire connection example (Pr. 250 = "8888")
Stop operation
Refer to page 112
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.
When the start signal is turned
OFF, the motor decelerates to
stop.
STF
Inverter
STR
SD
10
2
5
4
Time
ON
117
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