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Mitsubishi Electric FR-F740-00023 Instruction Manual: Start Signal Selection (stf, Str, Stop Signal, Pr. 250); Start Signal Selection (stf, Str, Stop Signal, Pr)

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Function assignment of external
terminal and control

4.10.4 Start signal 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 107 for stop selection)
Parameter
Name
Number
250
Stop selection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 173)
(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 2-5,
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 82)
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.
Forward
rotation start
Reverse
rotation start
ON
STF
STR
2-wire connection example (Pr. 250 = "9999")
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
107)
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.
114
Initial
Setting
Value
Range
0 to 100s
1000s to
1100s
9999
9999
8888
STF
STR Inverter
PC
10
2
5
Time
ON
Description
Start Signal (STF/STR)
STF signal: Forward rotation
start
STR signal: Reverse rotation
start
STF signal: Start signal
STR signal: Forward/reverse
rotation signal
STF signal: Forward rotation
start
STR signal: Reverse rotation
start
STF signal: Start signal
STR signal: Forward/reverse
rotation signal
STF
Start signal
STR Inverter
Forward/
reverse
PC
signal
ON
STF
STR
2-wire connection example (Pr. 250 = "8888")
Stop Operation
(Refer to page 107)
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.
10
2
5
Time
ON

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