Product Manual

Operation
24 900-0145-01-01 Rev B
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 21 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.
AC Current Settings
The AC current settings,
Grid Input AC Limit
and
Gen Input AC Limit
, control the amount of current
that the inverter draws from the source(s). When using either of the Radian’s AC inputs, the
appropriate setting limits the input. Adjust these settings to match the input circuit breakers.

The adjustment is meant to protect a generator or source that cannot supply enough current for both
charging and loads. If the combined charging and loads exceed the setting, the inverter will reduce its
charge rate and give priority to the loads. If the loads exceed this number on their own, the charge rate will
be reduced to zero.

The Radian’s battery charger and grid-interactive function have individual settings. However, the
AC Limit
settings can also limit the charging or selling current.

The
Support
input mode allows the Radian to support the AC source with battery power. See page 14.
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