Product Manual

Operation
900-0198-01-00 Rev A 29
Power Save
Each FX inverter consumes 34 watts of idle power while it remains on, even if it is not actively inverting or
charging. The Power Save function allows the option to put part of a parallel system into a quiescent state
known as Silent mode. This mode minimizes the idle consumption. The inverters will come on again
when the loads require power. (The term “Silent” is also used in an unrelated context during battery
charging. See page 21.)

When the load increases by 12 Aac, the master inverter activates an additional slave inverter for assistance. When
the load decreases to 4 Aac or less (as detected by the master), the slave is deactivated and returns to Silent
mode. Each additional load increments of 12 Aac activates an additional slave.

The order in which slaves activate (or return to Silent mode) is controlled by programming in the system display.
The inverters are given a “rank”, or level number. Lower rank numbers activate when lesser loads are applied.
Higher ranks only activate when the load increases to a high level.

The lowest-ranked inverters, particularly the master, do not enter Silent mode. They remain active unless
specifically turned off. These inverters can still enter Search mode.
Figure 13 Power Save Levels and Loads
The actual watt and ampere thresholds for activating each model are depicted on the following pages.
When using the MATE3 System Display:
It is advisable to use the MATE3 Configuration Wizard to set up Power Save Levels.
To set these items manually:
The system display uses
Power Save Level
selections to assign ranks to the inverter on each port. The
screen reads
Master
or
Slave Power Save Level
, depending on the inverter’s stacking designation.

Master Power Save Level
appears on an inverter which is set as master (the default setting). The range of rank
numbers is 0 to 10. The default value is 0. The master is normally left at this value.

The
Master Power Save Level
function is used for the master inverter on Port 1. It is also used for any subphase
masters in a series or three-phase system. The ranking of a subphase master is treated the same as the master. If the
master is set at 0, subphase masters should also be 0.

Slave Power Save Level
appears on an inverter which is set as slave. The range of rank numbers is 1 to 10. (The
default value for all ports is 1.)
The ranks are prioritized so that lower-numbered ranks turn on sooner and higher ranks turn on later.
The lowest-ranked inverter does not go silent and remains on unless ordered otherwise. The
lowest-ranked inverter is expected to be the master. The priorities are the same across both screens. If
Port 1 (master) is set at 0 and Port 2 (slave) is set at 1, the slave will turn on later. Since the
Master
item is
the only one that goes to 0, it is easy to ensure that all slave inverters go silent.
Master
Slave 1 Slave 3Slave 2
Off
Off Off
On
Off Off
On
On Off
On
On On
On
On
On
Increasing load
Minimal load
High load
On
Maximum load