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2. Classic Slave
• Classic Slave is the designation of the second FX in a two-inverter, split-phase system that produces
400VAC without using an FW-X240 Auto Transformer.
• This FX is plugged into Port 02 of the HUB.
This stacking option is not to be used in the International Series FX or VFX.
OB Slave L1 and OB Slave L2 designations are used in OutBack Parallel Stacking or OutBack Series/
Parallel stacking
3. OB Slave L1
• In an OutBack Parallel single phase system, all the Slave FXs on a single 230 VAC leg are designated
OB Slave L1.
• In an OutBack Series split phase system, which will include an FW-X240 or PSX-240 Auto Transformer,
any FX that runs in parallel to the Master FX is designated OB Slave L1. These FXs must be plugged
into the lowest HUB Ports.
• The OB Slave L1 Stacking is typically used for an entirely o -grid application such as a cabin that
does not require 400 volts.
4. 3ph Master
• In 3-Phase stacking, the Master FX is designated as 3ph Master.
• 3ph Master and 3ph Slave designation are used in OutBack 3-Phase stacking.
5. 3ph Slave
• In 3-Phase stacking, each of the Slave FXs, which should be plugged into HUB Ports 02 (phase B) and
03 (phase C) respectively, is designated as 3ph Slave.
• When the HUB jumper is set between Port 02 and Port 03, the HUB identi es a phase for each Slave FX.
Stacking Phases/Assigning FX Status (in order):
1. 1-2ph Master
2. Classic Slave
3. OB Slave L1
4. OB Slave L-2
5. 3ph Master
6. 3ph Slave