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Operation
900-0112-01-00 Rev B 13
Description of Functions
All items identified as settable or adjustable have set points which can be accessed using the remote
system display. (See the system display manual for instructions on locating these set points.) The
default settings and ranges of adjustment are listed near the end of this book, beginning on page 47.
Each function is accompanied by a symbol representing the inverter and that function:
The symbols for each function may have other features depending on the function.
Inverting
A GFX inverter uses a transformer and a high-frequency H-Bridge FET design to convert DC voltage
from batteries into AC voltage that is usable by AC appliances. It will continue to do this as long as the
batteries have sufficient energy. The batteries can be supplied or recharged from other sources, such
as solar, wind, or hydroelectric power.
The inverter requires batteries to operate. Other sources may not maintain DC voltages that are
consistent enough for the inverter to operate reliably.
CAUTION: Equipment Damage
Do not substitute other DC sources in place of the batteries. High or irregular voltages
may damage the inverter. It is normal to use other DC sources in conjunction with the
batteries and the inverter, but not in place of the batteries.
Certain features will affect the inverter’s operation. These features only operate when the inverter is
generating AC power on its own. They do not function when the inverter is supplied by an AC source.
¾
Low Battery Cut-Out (LBCO): This function prevents the inverter from draining the batteries completely.
When the DC voltage drops below a specified level for 5 minutes, the inverter will stop functioning. The
system display will give a
Low Battery Voltage
or
Low Battery V
error. This is one of the Error messages
described on page 37. This function is intended to protect both the batteries and the inverter’s output.
(Continuing to invert on a low DC voltage may produce a distorted waveform.) This item is adjustable.
¾
Low Battery Cut-In (LBCI): The recovery point from Low Battery Cut-Out. When the voltage rises above this
point for 10 minutes, the Low Battery error will clear and the inverter will function again. This is adjustable.
∼ Connecting an AC source to charge the batteries will also clear a Low Battery error.
¾
AC Output Voltage: The inverter’s AC output can be turned up or down by a certain amount to adjust for
conditions. This item is adjustable.
¾
The inverter is also controlled by a high battery cut-out function. If the DC voltage rises above a certain level,
the inverter will immediately stop functioning. The system display will give a
High Battery Voltage
or
High
Battery V
error. This is one of the Error messages displayed on page 37. (If the voltage drops below this
point, the inverter automatically recovers.)
∼ For a 12-volt inverter, this voltage is 17 volts.
∼ For a 24-volt inverter, the voltage is 34 volts
∼ For a 48-volt inverter, the voltage is 68 volts.
The high battery cut-out voltages cannot be changed.
AC IN
AC OUT
DC
T
RANSFER
These items represent the input from the AC
source, the output to the AC loads, DC functions
(inverting, charging, etc), and the transfer relay.
Arrows on each symbol represent current flow.
This function is intended to protect the
inverter’s output and loads. Continuing to
invert on a high DC voltage may produce a
distorted waveform. Note that the high battery
cut-out does not alleviate the high battery
condition itself; it is an external condition.