Product Manual

Operation
900-0167-01-00 Rev B 45
Figure 16 Power Save Priority (Parallel)

The fourth line shows that loads of 36 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 16 Aac. Since this load is distributed among four inverters,
the master reads 4 Aac, the lower threshold for Power Save. This causes one slave to enter Silent mode. The
16 Aac are distributed among the remaining three inverters. If the loads decreased to 12 Aac, a second slave
would go silent.
Figure 17 shows a system of six FXR2012A inverters. In this example the inverters have been stacked
in a split-phase system. The master inverter is on the L1 output while a subphase master is on L2.
Each master has two slave inverters.

The captions at the top indicate the ranking of each inverter.

The captions also show the port assignments on the communications manager. The L1 inverters use ports 1,
2, and 3. However, the communications manager requires the L2 inverters to use ports 7, 8, and 9.

The notations at the bottom show how the inverters are activated in sequence as loads are applied. The
loads on L1 and L2 are not applied equally, so they are not activated at the same time.
Figure 17 Power Save Priority (Split-Phase)

The fourth line shows that loads of 36 Aac or more (approximately 4 to 4.5 kW) are present on both L1 and
L2. This load causes all six inverters to be activated.

The last line shows that the loads on L1 are reduced to 16 Aac. This causes one slave to go silent. The loads
on L2 are reduced to 12 Aac, causing two slaves to go silent.
Master
Slave 1 Slave 3 Slave 2
Port 1
Master Power Save = 0
Port 2
Slave Power Save = 1
Port 4
Slave Power Save = 3
Port 3
Slave Power Save = 2
<12 Aac On Off Off Off
12 Aac On On Off Off
24 Aac On On On Off
36 Aac On On On On
16 Aac On On On Of
f
L1 Master L1 Slave 1 L2 Sub
p
hase MasterL1 Slave 2
Port 1
Master Power
Save = 0
Port 2
Slave Power
Save = 1
Port 7
Master Power
Save = 0
Port 3
Slave Power
Save = 2
L1 Load L2 Load
9 Aac On Off Off 9 Aac On Off Off
12 Aac On On Off 9 Aac On Off Off
24 Aac On On On 18 Aac On On Off
36 Aac On On On 36 Aac On On On
16 Aac On On Off 12 Aac On Off Off
L2 Slave 1 L2 Slave 2
Port 8
Slave Power
Save = 1
Port 9
Slave Power
Save = 2