Product Manual

Operation
900-0145-01-01 Rev B 41
Additional Notes for the Radian GS7048E:
The GS7048A has two modules. The modules are controlled individually. The Power Save function
will activate one module at a time, making an additional 3.5 kW of power available for every load
increase of approximately 2.5 kW.
Figure 13 shows a system of four GS7048E inverters (the master and three slaves) in a parallel system
with a common load bus. The labels at the top indicate the ranking of each unit. The notations at the
bottom show how the units are activated in sequence as loads of approximately 2.5 kW are applied.

The first line shows little load and only the first module in Master is activated.

The second line shows load beginning to be applied. The second module in Master is activated.

The third line shows increasing load. The first module in Slave 1 is activated.

The fourth line shows even higher load. Slave 1 is completely activated.
In general, roughly 5 kW of loads are applied to fully activate an additional slave inverter.

In the example shown in Figure 13, an 8-kW load has been applied, fully activating the first slave.

In this example, loads of approximately 17 to 18 kW would be needed to turn on all inverters.
Figure 13 GS7048E Power Save Priority
Forcing Specific Slaves to be Active:
It is possible to raise the priority of a slave and force it to activate. This is done by setting the master
rank higher than that slave. However, the
Master Power Save Level
scale is not the same as the
Slave
level.
Slave
level settings apply to the whole inverter.
Master
level settings are applied per module.
This means that increasing the master by one rank will only turn on one additional module. To
completely turn on a slave inverter, the master must be increased two ranks. See the next page.
On Off Off Off
Off Off Off Off
On On Off Off
Off Off Off Off
Module 1 Module 2
Module 1 Module 2 Module 1 Module 2 Module 1 Module 2
On On On Off
Off Off Off Off
On On On On
Off Off Off Off
Minimal load
approx. 5 kW
approx. 2.5 kW
approx. 7 to 8 kW
Master
Master Power Save
= 0
Slave 1
Slave Power Save
= 1
Slave 2
Slave Power Save
= 2
Slave 3
Slave Power Save
= 3