Figure 15 Power Save Priority (Parallel); Figure 16 Power Save Priority (Three-Phase) - Outback Power Systems FXR2012E Operator's Manual

Operation
Master Power Save = 0
<6 Aac
6 Aac
12 Aac
18 Aac
8 Aac

The fourth line shows that loads of 18 Aac or more (approximately 4 to 4.5 kW) are present on the system.
This load causes all four inverters to be activated.

The last line shows that the loads are reduced to 8 Aac. Since this load is distributed among four inverters,
the master reads 2 Aac, the lower threshold for Power Save. This causes one slave to enter Silent mode. The
8 Aac are distributed among the remaining three inverters. If the loads decreased to 6 Aac, a second slave
would go silent.
Figure 16 shows a system of six FXR2012E inverters. In this example the inverters have been stacked in
a three-phase system. The master inverter is on the Phase A output while subphase masters are on
Phase B and Phase C. Each master has one slave inverter.

The captions at the top indicate the ranking of each inverter.

The captions also show the port assignments on the communications manager. The Phase A inverters use
ports 1 and 2 However, the communications manager requires the Phase B and C inverters to use ports 4
and 5 and ports 7 and 8 respectively.

The notations at the bottom show how the slaves are activated as loads are applied. The load on Phase C is
not equal to the others, so the slave is not activated at the same time.
Phase A
Master
Port 1
Master Power
Save = 0
Load (A)
5 Aac On
6 Aac On
12 Aac On
12 Aac On

The third line shows that loads of varying size on all phases have caused all inverters to be activated.

The last line shows that the load on Phase B is reduced to 4 Aac. This causes the slave to go silent. The other
phases are not affected.
48
Master
Slave 1
Port 1
Slave Power Save = 1
On Off
On On
On On
On On
On On
Figure 15 Power Save Priority (Parallel)
Slave 1 Subphase Master
Port 2
Slave Power
Save = 1
Load (B)
Off 5 Aac
On 6 Aac
On 8 Aac
On 4 Aac
Figure 16 Power Save Priority (Three-Phase)
Slave 2
Port 2 Port 3
Slave Power Save = 2
Off
Off
On
On
On
Phase B
Slave 1
Port 4 Port 5
Master Power Slave Power
Save = 0 Save = 1
On Off
On On
On On
On Off
Slave 3
Port 4
Slave Power Save = 3
Off
Off
Off
On
Off
Phase C
Subphase Master Slave 1
Port 7 Port 8
Master Power Slave Power
Save = 0 Save = 1
Load (C)
5 Aac On
5 Aac On
10 Aac On
10 Aac On
900-0169-01-00 Rev A
Off
Off
On
On