Magnum Energy MMS Series - Manual (Page 26)

© 2014 Magnum Energy, Inc.
Ensure the DC wire connections (to batteries, inverter, and fuse lugs/
DC circuit breaker) are fl ush on the surface of the DC terminals, and
the hardware (lock washer and nut) used to hold these connections
are stacked correctly (see Figures 11 and 12).
Verify all DC connections are torqued from 10 to 12 ft-lbs.
Once the DC connections are completely wired and tested, coat the
terminals with an approved anti-oxidizing spray.
Press the red and black terminal covers onto the inverter’s DC con-
nectors to secure them in place.
If batteries are in an enclosure, perform a fi nal check of the hold down
brackets and all connections. Close and secure the battery enclosure.
2.4 AC Wiring
This section describes the MMS Series’ required AC wire size and
overcurrent protection. It also provides information on how to make
the AC connections.
Info: The MMS1012-G model has a power cord for AC
input and dual outlets on top of the inverter for AC output
(has hardwiring capability as well).
WARNING: All wiring should be done by a qualifi ed per-
son or a licensed electrician following all local/NEC codes.
2.4.1 Neutral to Safety Ground Bonding
The NEC/CEC (National Electric Code/Canadian Electrical Code)
provide the standards for safely wiring mobile (RV, boat, or truck)
installations. These wiring standards require the AC source (inverter,
shorepower, or a generator) to have the neutral conductor tied to
ground. These standards also require that the AC neutral be con-
nected to safety ground (often called a “bond”) in only one place at
any time.
If more than one bond is established, currents can circulate
between neutral and ground and cause ground-loop currents. These
“ground-loops” can trip GFCIs and cause an electric shock hazard.
In mobile installations, there may be multiple AC sources (i.e.,
shorepower, generator, or inverter), which means there may be the
potential of having multiple neutral-to-ground connections.
2.4.2 AC Wiring Connections
For the MMS1012 model, the AC input and output wiring is performed
in the AC wiring compartment. This compartment is accessed via the
top panel (Figure 3, Item 8). If the panel cover is installed, remove
the two Phillips screws on the cover to access the AC wiring compart-
ment and locate the inverter’s AC wiring. There is a label located in
the AC access compartment which gives information on which wires
are used for AC input and output. You can also refer to Table 3 to
match the inverter’s AC wires to the appropriate AC wire connection.
Installation
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