Installation Guide

Installation

900-0160-01-01 Rev B

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,

(generator) and

RID

, for ease of

installation. The Radian transfers each source with a separate relay. However, internally it can

only connect to one AC source at a time. It cannot use both 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

RID

terminals. The source priority can be changed using the system display.

NOTE

: The terminals are labeled due to common conventions, not inverter requirements. The

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

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

RID

terminals are energized, an automatically controlled

generator will shut down. This prevents an automatic generator from working correctly when

using the

RID

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.

In Figure 18, the arrow between the output neutral and ground wires indicates that these two wires

have been bonded together, usually at the main electrical panel. Only one bond should be made

between neutral and ground at any time. See pages 25 and 29. If a generator is present in a

permanent installation, the generator’s neutral and ground should be isolated.

Figure 18 AC Sources