YASKAWA Varispeed E7 Instruction Manual And Parameter Description page 147

Performing Operations Using 3-Wire Control
When any constant from H1-01 to H1-05 (multi-function contact input terminals S3 to S7) is set to 0, termi-
nals S1 and S2 are used for a 3-wire control, and the multi-function input terminal that has been set to 0 works
as a forward/reverse selection command terminal.
When the Inverter is initialized for 3-wire control with A1-03, multi-function input 3 becomes the input termi-
nal for the forward/reverse run command.
Forward/reverse command
INFO
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Stop switch Operation switch
(NC contact) (NO contact)
Fig 6.9 3-Wire Control Wiring Example
Run command
Stop command
OFF (forward)
Motor speed
Stop Forward
Fig 6.10 Three-wire Control Time Chart
Use a control circuit 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.
Run command (operates when ON)
Stop command (stopped when ON)
Forward/reverse command (multi-function input)
SN
Digital input neutral
50 ms min.
Can be either ON or OFF
OFF
(stopped)
ON (reverse)
Reverse Stop Forward