Installation Guide

Installation

24 900-0168-01-00 Rev C

AC Sources

The inverter has a single set of AC terminals which are intended to connect to a single AC source.

It cannot be directly wired to more than one AC source at the same time.

If multiple sources are

used, it is usually required to have a selector switch that changes from one to the next. The switch

should be the “break before make” type which disconnects from one source before contacting

another. This prevents the risk of connecting to two out-of-phase sources at the same time or

connecting them to each other.

Figure 13 AC Sources

The inverter’s transfer relay is normally set to provide inverter power to the output. This is shown in

Figure 13, where the internal transfer relay is switched to the inverter function.

Figure 14 AC Sources and Transfer Relay

When an AC source is connected and accepted, the internal transfer relay switches to transfer the AC

source power to the loads. Figure 14 shows the utility grid switch closed. The internal transfer relay

has switched accordingly so that the loads receive utility power. (See the Operator’s Manual for the

inverter’s acceptance criteria.)

NEU HOT (internal connections)

Inverter

OUTPUT

NEU

GND

Loads

Internal

Transfer Relay

Utility Grid Generator

GND NEU HOT

Single-Pole

Double-Throw

Switch