Start Signal Selection (Terminal Stf, Str, Stop, Pr. 250) - Mitsubishi Electric F700 Instruction Manual

3.9.4

Start signal selection (Terminal STF, STR, STOP, 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 84 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 140)
(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 67))
⋅ 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
PC
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 84)
⋅ 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/STF)
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
STR signal: Forward/
8888
Start signal
Forward/
reverse
signal
Time
ON
Function assignment of external
terminal and control
Description
The motor is coasted to a
start
stop when the preset time
elapses after the start signal
start
is turned 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
start
turned off, the motor
decelerates to stop.
reverse rotation
signal
STF
STR Inverter
PC
10
2
5
ON
STF
STR
2-wire connection example (Pr. 250 = "8888")
Pr.247
page 55
Pr. 251
page 117
Stop Operation
Time
ON
89
3