Mitsubishi Electric FR-D720 K Series Instruction Manual page 125

(2) Three-wire type (STF, STR, STOP signal)
The three-wire connection is shown below.
Turning the STOP signal ON makes start self-holding function valid. In this case, the forward/reverse rotation signal is
activated only as a start signal.
If the start signal (STF or STR) is turned ON and then OFF, the start signal is held and makes a start. When changing the
direction of rotation, turn STR (STF) ON once and then OFF.
In order to decelerates the motor to a stop, turn OFF the STOP signal once.
When using the STOP signal, set "25" in any of Pr.178 to Pr.182 to assign function.
Forward
Stop
rotation start
Reverse
rotation start
Forward
rotation
Reverse
rotation
ON
STF
STR
STOP ON
3-wire connection example (Pr. 250 = "9999")
REMARKS

When the JOG signal is turned ON to enable Jog operation, the STOP signal becomes invalid.

If the MRS signal is turned ON to stop the output, the self-holding function is not canceled.
(3) Start signal selection
STF STR
OFF OFF
OFF ON
ON OFF
ON ON
Parameters referred to
Pr. 4 to Pr. 6 (multi-speed setting)
Pr. 178 to Pr. 182 (input terminal function selection)
Function assignment of external terminal and control
STF
Inverter
STR
STOP
SD
Time
ON
OFF OFF
Pr. 250 Setting Inverter Status
0 to 100s, 9999
Stop
Reverse rotation
Forward rotation
Stop
Refer to page 92.
Refer to page 116.
Stop Start
Forward rotation
/reverse rotation
Forward
rotation
Reverse
rotation
ON
STF
ON
STR
STOP ON
OFF
3-wire connection example (Pr. 250 = "8888")
1000s to 1100s, 8888
Stop
Forward rotation
Reverse rotation
STF
Inverter
STOP
STR
SD
Time
ON
OFF
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