Mitsubishi Electric FR-A720-0.4K Instruction Manual page 238

Function assignment of external terminal and control
(2) 3-wire type (STF, STR, STOP signal)
⋅ A three-wire type connection is shown below.
⋅ The start self-holding selection becomes valid when the STOP signal is turned on. In this case, the forward/reverse
rotation signal functions 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.
⋅ To stop the inverter, turning off the STOP signal once decelerates it to a stop.
Forward
Stop
rotation start
Reverse
rotation start
ON
STF
STR
STOP ON
ON
Three-Wire Type Connection Example (Pr. 250 = "9999")
REMARKS
⋅ The STOP signal is assigned to the terminal STOP in the initial setting. By setting "25" in Pr. 178 to Pr. 189, the STOP signal can
also be assigned to the other terminal.
⋅ 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. 189 (Input terminal function selection)
228
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 161
Refer to page 222
Stop
Start
Forward rotation
/reverse rotation
ON
STF
STR
STOP ON
Three-Wire Type Connection Example (Pr. 250 = "8888")
1000s to 1100s, 8888
Stop
Forward rotation
Reverse rotation
STF
Inverter
STOP
STR
SD
Time
ON
ON
OFF OFF