Installation Guide

Installation
900-0144-01-01 Rev B 23
A Ground Terminal Bus Bar (TBB) is also available if multiple ground connections are needed (see
Figure 14 on page 19).
WARNING: Shock Hazard
During an error shutdown, the inverter’s output terminals are not live. However,
if the inverter recovers from a shutdown, the terminals will become live without
notice. Several error shutdowns can be recovered automatically, including
Low
Battery V
,
High Battery V
, and
Over Temperature.
See the Troubleshooting
section and the list of error messages in the Radian Series Inverter/Charger
Operator’s Manual for more information.
AC Sources
The inverter’s transfer relay is normally set to provide inverter power to the output. The conditions for
AC acceptance are defined by the inverter’s programmed settings and AC input mode. The relay will
switch to transfer the AC source power to the output when the AC acceptance conditions are met.
The Radian inverter has connections for two AC sources,
GEN
(generator) and
GRID
, for ease of
installation. Each source is transferred with a separate relay. However, internally it can only connect
to one AC source at a time. It cannot use both utility grid and generator power at the same time. If
presented with two sources of power, the default setting is to accept the source connected to the
GRID
terminals. The source priority can be changed using the system display.
NOTE:
The terminals are labeled due to common conventions, not inverter requirements. The
GEN
terminals can accept grid power if necessary. The opposite is also true. Each input can accept any AC
source as long as it meets the requirements of the Radian and the selected input mode, with the
following exception.
IMPORTANT:
The generator must be connected to the
GEN
terminals if using either the
MATE3’s Advanced Generator Start (
AGS
) function or the Radian’s
GenAlert
auxiliary function. If the input priority is set to
GRID
and the
GRID
terminals are
energized, an automatically controlled generator will shut down. This prevents an
automatic generator from working correctly when using the
GRID
terminals.
NOTE
: If an AC source is present on the priority input, the second input cannot accept another source
for any reason. This is true even if the inverter has not accepted the priority source. The behavior is
the same whether the first source was rejected for quality issues or because of programmed settings.
Figure 18 AC Sources