Once on, exit set-up… weld.

[vostok]

Turn Encoder control to turn Spot
on and off. Once on, exit set-up and
press Amperage control switch pad
twice and turn Encoder control to
set spot time.

[Alex Nord]

два положения - on и off
once on - в положении on
exit set-up - очевидно выйти из режима настройки