Outback FX-R Series Operator Manual

Operation
900-0167-01-01 Rev A 27
Multiple Inverters
In a stacked system, whenever the master inverter senses acceptable AC input, it orders the
other inverters to transfer to the AC source. The AC source is expected to deliver power (in the
appropriate phase) to the input of all inverters. Subphase master and slave inverters cannot
transfer until the master does.

A subphase master inverter may receive this command without receiving acceptable AC input. The
subphase master will not transfer and will continue inverting (in the correct phase with respect to the
master). It will display a
Phase Loss
warning (see page 53).

If a slave inverter does not sense acceptable input, it will not transfer to the AC source, but will
continue supporting the master (or subphase master) output using existing sources. The slave will
display a
Phase Loss
warning.

If a slave inverter senses acceptable input but the master (or subphase master on that phase) does
not, the slave will not transfer to the AC source. It will continue supporting the master or subphase
master and will display a
Phase Loss
warning.

In any of these cases, this warning appears as an event on a MATE3-class system display.
The FXR inverter’s stacking function includes the option called
Multi-Phase Coordination
. The
selectable menu item is
Coordinated AC Connect/Disconnect
. If selected, the AC source is
required
to deliver input (in the appropriate phase) to all inverters.

If the master or subphase master inverters do not sense an acceptable AC source, the entire system
will disconnect from the source.

None of the inverters will reconnect until the source is acceptable for the duration of the appropriate
timer. This may be either the
Connect Delay
or the
Re-Connect Delay
timer. See page 18.

This function does not apply to slave inverters. A slave inverter with an unacceptable AC source will
not cause a general
System Disconnect
.

A general
System Disconnect
will not cause the inverters to show a
Phase Loss
warning.
See page 18 for more information on
Multi-Phase Coordination
. See the menu tables
beginning on page 66 for the default settings and ranges.
Generator Input
A generator should be sized to provide enough power for all inverters, both for loads and for
battery charging. The generator’s voltage and frequency must match the FXR inverter’s
acceptance settings. Some generators may not be able to maintain AC voltage or frequency for
long periods of time if they are loaded more than 80% of rated capacity.
The generator is required to have a stable output before its power is accepted by the inverter.
Some generators with less stable or uneven outputs may not be accepted. The use of the
Generator
input mode may assist with this problem.
If a smaller generator must be used, the
Support
input mode may be able to provide support to
the loads from the batteries during peak load times. The inverter can recharge the batteries
during non-peak times.