Start Signal Selection (Terminal Stf, Str, Stop, Pr. 250) - Mitsubishi Electric FR-F740-00023-EC Instruction Manual

Function assignment of external
terminal and control
3.9.4

Start signal selection (Terminal STF, STR, STOP, Pr. 250)

You can select the operation of the start signal (STF/STR).
Pr.247
Used to select the stopping method (deceleration to a stop or coasting) when the start signal turns off.
page 59
Used to stop the motor with a mechanical brake, etc. together with switching off of the start signal.
Pr.251
page 123
(Refer to page 89 for stop selection)
Parameter
Number
250 Stop selection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 146)
(1) 2-wire type (terminal STF, STR)
⋅ 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 72)
⋅ 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
rotation start
Reverse
rotation start
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
89)
⋅ 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.
94
Initial
Name
Value
9999
STF
STR Inverter
PC
10
2
5
ON
ON
Setting
Range
Start Signal (STF/STR)
STF signal: Forward rotation
start
0 to 100s
STR signal: Reverse rotation
start
STF signal: Start signal
1000s to
STR signal: Forward/reverse
1100s
rotation signal
STF signal: Forward rotation
start
9999
STR signal: Reverse rotation
start
STF signal: Start signal
8888 STR signal: Forward/reverse
rotation signal
Start signal
Forward/
reverse
signal
Time
STF
STR
2-wire connection example (Pr. 250 = "8888")
Description
Stop Operation
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
STR Inverter
PC
10
2
5
ON
ON
Time