Outback Power Systems GS4048A Operators Manual - Manual (Page 25)

Operation
900-0161-01-00 Rev A 23
Search
An automated search circuit is available to minimize the power draw when no loads are present.
When enabled, the inverter does not always deliver full output. The output is reduced to brief pulses
with a delay between them. These pulses are sent down the output lines to see if a resistance is
present. Basically, the pulses “search” for a load. If a load is detected on the output, the inverter’s
output increases to full voltage so that it can power the load. When the load is turned off, the inverter
“goes to sleep” and begins searching again.
The sensitivity of Search mode is in increments of approximately 0.1 Aac. The default is 6 increments,
or about 0.6 Aac. A load which draws this amount or greater will “wake up” the inverter.
NOTE: Due to load characteristics, these increments are only approximate and may not function
exactly as listed.
The pulse duration and the delay both have a time period that is measured in AC cycles. These two
items and the load detection threshold are adjustable.
 Search mode may not be useful in larger systems with loads that require continuous power (e.g., clocks,
answering machines, fax machines). Search mode may cause nuisance shutdowns, or it may sleep so rarely
that there is no benefit.
 Some devices may not be easily detected by Search mode.
 Search is inoperative if the UPS input mode is in use. See page 17 for more information on this mode.
Input
When the Radian inverter input terminals are connected to a stable AC source, the inverter will
synchronize itself with that source and use it as the primary source of AC power. Its transfer relay will
engage, linking the AC source directly with the inverter’s output. It can also use the source to charge
batteries. (See Battery Charging on page 27.)
 Two sets of AC input terminals are available. Both inputs are identical and can be used for any AC source.
However, for easy reference, the first input has been labeled
GRID (for the utility grid). The second input is
labeled GEN (for a generator). These designations are also used in the menus of the MATE3 system display.
∼ Each input has a separate set of input criteria and input modes.
∼ The criteria, modes, and other programming for each input contain identical content.
 The independent inputs are intended to simplify the connection to multiple AC sources; however, the
inverter can only use one input at a time. If both inputs are powered, the default setting is for the inverter to
accept the
GRID input. This can be changed. In the MATE3 system display, these priorities are selected
using Input Priority in the AC Input and Current Limit menu.
 Seven input modes are available which affect the Radian inverter’s interactions with AC input sources.
The
Grid Tied mode allows the Radian to sell power using the input connection. The Support mode can use
battery power to assist a smaller AC source. See page 20 for descriptions of these and other input modes.
 The loads powered by the inverter must not exceed the size of the inverter’s transfer relay.
CAUTION: Equipment Damage
Current draw in excess of the transfer relay rating can damage the transfer relay. This
damage is not covered by warranty. Use protective devices of appropriate size.