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

Function assignment of external terminals
6.9.4

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 section 6.8.3 for stop selection.)
Pr. Initial
Name
No. Value
250
Stop selection 9999
The above parameter can be set when Pr. 160 = 0.
2-wire type (terminals STF and 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 cor-
responding 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 10V DC across the speed setting
input terminal 2-5, by setting the required values in Pr. 4 to Pr. 6 "Multi-speed setting" (high, mid-
dle, low speeds), etc. (For multi-speed operation, refer to section 6.5.1.)
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
6 - 116
Description
Setting
Start Signal
Range
(STF/STR)
STF: Forward
rotation start
0–100s
STR: Reverse rotation
start
STF: Start signal
1000s–
STR: Forward/reverse
1100s
signal
STF: Forward
rotation start
9999
STR: Reverse
rotation start
STF: Start signal
8888 STR: Forward/reverse
signal
Inverter
ON
ON
Stop Operation
The motor is coasted to a
stop when the preset time
elapses after the start signal
is turned off.
The motor is coasted to a
stop (Pr. 250 − 1000)s after
the start signal is turned off.
When the start signal is
turned off, the motor decel-
erates to stop.
Fig. 6-61:
2-wire type connection (Pr. 250 = 9999)
Time
Parameter
Refer to
Parameters referred to
Section
4–6 Multi-speed 6.5.1
setting
178–189 Input terminal 6.9.1
function
selection
I001148E