Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 504

NOTE
• By setting Pr.250= "0 to 100, 1000 to 1100", the motor will coast to a stop when the start command is turned OFF. (Refer to
page 688.)
• The STF and STR signals are assigned to the STF and STR terminals in the initial status. The STF signal can be assigned to
terminal STF only using Pr.178 STF terminal function selection, and the STR signal can be assigned to terminal STR only
using Pr.179 STR terminal function selection.
 3-wire type (STF signal, STR signal, STP (STOP) signal)
• The following figure shows the 3-wire type connection.
• The self-holding function is enabled when the STP (STOP) signal is turned ON. In such case, the forward/reverse signal
is simply used as a start signal.
• Even if a start signal (STF or STR) is turned ON and then OFF, the start command remains valid and the motor operation
continues. To change the rotation direction, turn the STR (STF) signal ON once and then OFF.
• In order to decelerates the motor to a stop, turn OFF the STP (STOP) signal once.
Forward
Stop
rotation start
Reverse
rotation start
ON
STF
STR
STP (STOP) ON
3-wire type connection example (Pr.250 = "9999")
NOTE
• The STP (STOP) signal is assigned to terminal STP (STOP) in the initial status. Set "25" in any of Pr.178 to Pr.189 to assign
the STP (STOP) signal to another terminal.
• When the JOG operation is enabled by turning ON the JOG signal, the STOP signal will be disabled.
• Even when the output is stopped by turning ON the MRS signal, the self-holding function is not canceled.
 Start signal selection
STF
OFF
OFF
ON
ON
STF
Inverter
STR
STP (STOP)
SD
Time
ON
OFF OFF
STR
OFF
ON
OFF
ON
Stop
Start
Forward rotation
/reverse rotation
ON
STF
ON
STR
STP (STOP) ON
OFF
3-wire type connection example (Pr.250 = "8888")
Pr.250 setting and inverter condition
0 to 100 s, 9999
Stop
Reverse rotation
Forward rotation
Stop
5.12 (T) Multi-function input terminal parameters
STF
Inverter
STP (STOP)
STR
SD
Time
ON
OFF
1000 to 1100 s, 8888
Stop
Forward rotation
Reverse rotation
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
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