Wiring
975-0400-01-01
2–13
Connecting the XW SCC
The following procedure is illustrated in Figure 2-9.
To connect the XW SCC:
1. Ensure the PV array disconnect and battery disconnect are turned off.
2. Ground the XW SCC. Connect a grounding conductor between an XW SCC
ground lug and the system ground (as shown in Figure 2-9).
3.
Connect the PV array negative (–) output to the XW SCC terminal marked
PV
–.
4. Connect the PV array’s positive (+) output to the PV array disconnect.
5. Route another positive (+) cable from the other end of the PV disconnect to
the XW SCC terminal marked
PV
+.
6.
Connect the negative (–) battery cable to the XW SCC terminal marked
BAT
–.
7. Connect a positive (+) cable from the XW SCC terminal marked
BAT
+ to the
battery disconnect.
8. Connect a second positive (+) cable to the other side of the battery disconnect
and connect to the positive (+) battery terminal.
9. Torque the XW SCC terminals according to the following table:
WARNING: Shock hazard
Whenever a PV array is exposed to light, a shock hazard exists at the output wires or
exposed terminals. To reduce the risk of shock during installation, cover the array with an
opaque (dark) material before making the connections.
WARNING: Shock hazard
Do not connect the battery negative to ground. Bonding the battery negative to ground
disables the unit’s internal PV ground-fault protection. For more information, see
“Grounding” on page 2–7. See Figure 2-9 on page 2–14 for correct routing of the battery
negative.
CAUTION: Equipment damage
Do not connect the PV negative and battery negative terminals together anywhere in the
system, including the XW Power Distribution Panel or other DC disconnect. The PV
negative and battery negative must be connected to separate terminals as marked on the unit.
CAUTION: Reverse polarity damage
Before making the final DC connection or closing the DC breaker or disconnect, check
cable polarity at both the battery and the XW SCC. Positive (+) must be connected to
positive (+). Negative (–) must be connected to negative (–).
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