©
2009 Magnum Energy Inc
Page 36
Installation
2.6.6
Disabling the Neutral-to-Ground Connection
All MS Series Inverter/Chargers have the automatic neutral-to-ground switching feature. In some
installations/jurisdictions, this feature must be disabled. If you are not sure whether you must disable
this feature, check your local code requirements. The following steps will guide you in disabling the
neutral-to-ground switching feature in the MS Series inverter/charger.
Info:
The ground connection from the inverter’s AC and DC ground terminals should
still be connected to the system ground even if ground switching has been disabled.
WARNING:
Fire and Shock Hazard - Disconnect all AC and DC sources before working
in the AC wiring compartment.
Locate and remove the AC access cover plate
(shown as item 15, in
fi
gure 1-3) on the side
of the MS Series inverter.
Look inside and locate the green wire with
the insulated connector at the top of the AC
wiring compartment; see Figure 2-22. This
insulated connector connects the neutral and
ground inside the inverter while inverting.
Pull the two ends of the insulated connector
apart to separate the green wire; this will
prevent the neutral and ground from con-
necting inside this inverter.
Move the two disconnected ends away from
each other and push back out of the way. You
must ensure that the two connector ends will
not have any contact with any other wires
within the AC compartment. You may want
to use electrical tape to insulate the ends
and secure them out of the way.
1.
2.
3.
4.
Figure 2-22, Disconnecting the
Ground-to-Neutral connection
Neutral-to-
Ground
Connection
(Green Wire)
2.6.7
Connecting a Large Ground Wire
Marine installation require the ground wire to be the same size or one size smaller than the negative
cable. Use the following steps to allow a larger ground wire to be connected.
Locate the DC ground terminal (shown as
item 12, in
fi
gure 1-2).
Locate and remove the AC access cover plate
(shown as item 15, in
fi
gure 1-3) on the side
of the MS inverter.
Within the AC wiring area, locate the hex
nut on the backside of the DC ground termi-
nal. After locating the hex nut, use a 7/16’
wrench/nut driver to remove the hex nut,
bolt, lock washer and DC ground terminal
and remove them from the chassis.
Reverse the removed bolt and place back in
the chassis hole to attach a correctly sized
ground cable to the MS Series chassis as
shown in
fi
gure 2-23.
Place the washer and nut on the bolt over the
ground cable and securely tightened the nut
[from 4 to 5 ft lbf (5.4 to 6.8 N-m)].
1.
2.
3.
4.
5.
Figure 2-23, Large ground wire
connected to MS Series
DC Ground
terminal bolt/nut,
reversed and
tightened.
