Start Signal Operation Selection (Stf, Str, Stop Signal, Pr. 250) - Mitsubishi Electric FR-A700 Instruction Manual

4.15.4 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 210 for stop selection)
Parameter
Name
Number
250 Stop selection
(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 166)
⋅ 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.
Forward
STF
rotation start
STR Inverter
Reverse
rotation start
SD
10
2
5
ON
STF
STR
2-wire connection example (Pr. 250 = "9999")
REMARKS
⋅ When Pr. 250 is set to any of "0 to 100, 1000 to 1100", the motor coasts to a stop if the start command is turned off. (Refer to page
210)
⋅ 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.
Initial Setting
Value Range
Start signal (STF/STR)
STF signal: Forward rotation
0 to 100s
STR signal: Reverse rotation
STF signal: Start signal
1000s to
STR signal: Forward/reverse
1100s
9999
STF signal: Forward rotation
9999
STR signal: Reverse rotation
STF signal: Start signal
8888 STR signal: Forward/reverse
Start signal
Forward/
reverse
signal
Time
ON
Function assignment of external terminal and control
Description
The motor is coasted to a stop
start
when the preset time elapses
after the start signal is turned
start
off. When the setting is any of
1000s to 1100s, the inverter
coasts to a stop in (Pr. 250 -
1000)s.
rotation signal
start
When the start signal is turned
start
off, the motor decelerates to
stop.
rotation signal
STF
STR Inverter
SD
10
2
5
ON
STF
STR
2-wire connection example (Pr. 250 = "8888")
Stop operation
(Refer to page 210)
Time
ON
233
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