Outback Power Systems VFX Series Programming Manual - Manual (Page 37)

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If the FX’s AC source is available, the yellow AC IN
STATUS light will blink. The FX will connect to the
utility grid when the voltage is within 108-140VAC
and the frequency between 54-66 Hz. After about
30 seconds, the AC IN light should stop blinking
and stay lit. The FX will now perform a battery
charge using the available AC.
Turn the AC input breakers
ON.
BYPASS OUTPUT INPUT