YASKAWA E7U Programming Manual page 53

Function: 3-Wire Control
Setting: 0
When one of the digital inputs is programmed for 3-Wire control, that input becomes a Forward/Reverse directional input.
Whenever the input is open, the Drive will be set for forward rotation of the motor shaft. If the input it closed, then the motor
shaft will rotate in the reverse direction whenever a there is a Run input. The S1 and S2 digital inputs will function as a Run
and Stop input respectively.
Run command
Stop command
Forward/reverse
command
Motor speed
IMPORTANT
Function: Local/Remote Selection
Setting: 1
This function has been disabled. Please refer settings "6D" and "6E".
Stop
switch
(NC contact)
Fig. 30 Terminal Configuration for 3-Wire Control
OFF (forward)
Stop
Fig. 31 3-Wire Control Timing Diagram
As long as the S1(Run Command) input is applied in for at least 50 ms the Run command will latch
internally in the Drive.
Operation
switch
(NO contact)
Run command
(run on momentary close)
Stop command
(stop on momentary open)
S5
Forward / reverse command
SN
(multi-function input)
Sequence input common
50 ms min.
Can be either ON or OFF
ON (reverse)
Forward Reverse
Programming 47
OFF
(stopped)
TIME
Stop Forward