48
Freedom SW Installation Guide
Stacking Features
Neutral Wiring for Stacked Inverters
Due to the neutral ground switching design of the Freedom SW Inverter/
charger, it is mandatory that the
AC INPUT
and
AC OUTPUT N
eutrals be
isolated from one another. In a stacked pair configuration, connect the two
AC input neutrals together at the main distribution panel and the two AC
output neutrals at an isolated neutral location in the inverter AC distribution
panel.
Configuring System for Stacked Operation
Verify all DC and AC connections. Check Xanbus network connections and
ensure that terminators are installed at devices at each end of the network.
The simplest system includes a Xanbus SCP, the two Freedom SW inverter/
chargers to be stacked and two Xanbus terminators.
For both units to operate in stacked configurations, a Master and Slave have
to be assigned. The default out-of-box configuration for all Freedom SW
inverter/chargers is
Master
which causes a conflict the first time the system
is powered up. The installer will need to change configuration on one of the
inverter/chargers to
Slave
mode.
To configure the system for stacking:
1.
Apply DC power to both inverter/chargers.
Power up order has no impact. Because there are now two Master units
in the system, the SCP will display an
F66
fault, a “system
configuration fault”.
2.
From the SCP
System Status
screen, press
Enter
. The
Select Device
screen appears.
3.
Select the inverter to configure as a Slave unit from the list, then press
Enter
.
4.
Bring up the
Advanced Settings
screen by pressing
Enter
, Up, and
Down arrow buttons all together.
5.
Select
Advanced Settings
and press
Enter
. The Advanced Settings
screen appears.
Figure 21
Neutral Wiring for Stacking
L1
NEUTRAL
GROUND
AC IN
WARNING:
INCORRECT BATTERY
P
O
L
A
R
ITY
W
IL
L
C
A
U
S
E
D
A
M
A
G
E
TO U
N
IT
.
BATTERY
NEGATIVE
BAT
TERY
POS
ITI
VE
AC GROUNDS
(BEHIND COVER)
AC
OUT
AC
IN
30A
AC
IN
PU
T
LI
N
E
1
30A
AC
IN
PU
T
LI
N
E
2
30A
IN
VE
R
T
ER
AC
O
U
T
P
U
T
Wiring box cover must be in place during
use to reduce risk of injury to persons
REM
BTS
DC Ground or
Grounding Electrode
Terminal. See
manual for more
information.
N
L1
L2
N1
L1
L2
N2
WARNING:
INCORRECT BATTERY
P
O
L
A
RI
T
Y
WI
L
L
CA
U
S
E
DA
M
A
G
E
T
O
UN
IT
.
BATTERY
NEGATIVE
BAT
TERY
POSI
TI
VE
AC GROUNDS
(BEHIND COVER)
AC
OUT
30A
AC
IN
PU
T
LI
N
E
1
30A
AC
I
N
PU
T
LI
N
E
2
30A
IN
V
E
R
T
ER
AC
O
U
T
P
U
T
Wiring box cover must be in place during
use to reduce risk of injury to persons
REM
BTS
DC Ground or
Grounding Electrode
Terminal. See
manual for more
information.
Inverter AC
Distribution Panel
NEUTRAL
GROUND
30A
30A
I
N
P
U
T
O
U
T
P
U
T
AC
IN
N
L1
L2
N1
L1
L2
N2
I
N
P
U
T
O
U
T
P
U
T
Main
Distribution Panel
Two Freedom SW 3012 units shown.
Freedom SW 3K2K InvChg Install Guide.book Page 48 Wednesday, October 12, 2011 4:40 PM