YASKAWA Varispeed G7 Series Instruction Manual page 244

Performing Operations Using a 3-wire Sequence
When any constant from H1-01 to H1-10 (multi-function contact input terminals S3 to S12) is set to 0, termi-
nals S1 and S2 are used for a 3-wire sequence, and the multi-function input terminal that has been set func-
tions as a Forward/Reverse Run Command terminal.
When the Inverter is initialized for 3-wire sequence control with A1-03, multi-function input 3 becomes the
input terminal for the Forward/Reverse Run Command.
Stop switch
(NC contact)
Run Command
Stop Command
Forward/Reverse
Command
Motor speed
1. Use a sequence that turns ON terminal S1 for 50 ms or longer for the Run Command. This will make the
Run Command self-holding in the Inverter.
2. When the 3-wire sequence is set, do not make the wiring for the control circuit unless the multi-function
input terminal constant is set. Failure to observe this warning may result in injury.
INFO
Operation switch
(NO contact)
Fig 6.11 3-wire Sequence Wiring Example
50 ms min.
Can be either ON or OFF
OFF (forward)
Stop Forward
Fig 6.12 Three-wire Sequence Time Chart
Run Command
(operates when ON)
Stop Command
(stopped when OFF)
Forward/Reverse Command
(multi-function input)
Sequence input common
OFF
(stopped)
ON (reverse)
Reverse Stop
Run Command
Forward
6-
11