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©
2012 Magnum Energy, Inc.
Operation
3.1 Inverter DC Disconnect Breaker
The Inverter DC Disconnect Breaker is used to disconnect the battery during battery maintenance.
This disconnect can also be used to protect the inverter, battery, and inverter DC cables from over-
loads and short circuits. The inverter DC disconnect does not, however, disconnect the battery power
from the DC positive busbar in the MMP enclosure. So, if you have installed any optional DC load
breakers, you must turn OFF all DC load breakers to disconnect battery power to all the DC loads.
Before switching the DC Inverter Disconnect OFF, turn the inverter OFF.
This is to protect
the inverter and other equipment from failure, and to preserve the contacts in the breaker.
WARNING:
Do not use the DC disconnect breaker to turn your inverter on and off
on a regular basis, it is there to provide safety and ease of maintenance. Turn off the
inverter at its on/off switch
fi
rst. However, in an emergency, the inverter DC disconnect
is provided so that you can switch it off while the inverter is operating.
Info:
A
lways switch the DC disconnect breaker to OFF before connecting or disconnecting
the battery bank, to
r
educe the chance of spark and wear on the connectors.
3.2 AC Input Breaker
The AC Input Breaker when switched ON, allows the incoming AC source (utility or generator) to
be connected to the inverter’s AC input. This breaker should be switched OFF to disconnect the
AC power from the inverter AC input.
On MMPxxx-30D models, this breaker is a dual-pole 30-amp circuit breaker (see Figure 1-3). On
MMPxxx-60S models, the AC input disconnect breaker is one side of a dual 60-amp breaker; the
other side of this dual 60-amp breaker is used as the AC output breaker (see Figure 1-5).
3.3 Inverter AC Output Breaker
The Inverter AC Output Breaker when switched ON, allows the AC power out of the inverter—either
inverter power or pass-thru power (from the utility or generator)—to be connected to the AC loads.
With this breaker OFF, the connected inverter loads beyond the MMP enclosure can be serviced.
On MMPxxx-30D models, this breaker is a dual-pole 30-amp circuit breaker (see Figure 1-3). On
MMPxxx-60S models, the AC output disconnect breaker is one side of a dual 60-amp breaker; the
other side of this dual 60-amp breaker is used as the AC input breaker (see Figure 1-5).
3.4 Inverter AC Bypass Switch Breaker
The Inverter AC Bypass Switch Breaker allows the inverter loads to continue to be powered by
the incoming AC source (utility or generator) while isolating the inverter or battery system if
maintenance or repair is needed.
This switch is pre-wired in the MMP enclosure between the incoming AC source and the inverter
load panel (i.e., sub-panel). It connects the incoming AC source to the inverter’s AC loads; either
through the “inverter” or directly by “bypassing” the inverter. This bypass switch assembly uses
a mechanical interlock between two AC breakers to prevent both breakers from being ON at the
same time, but both can be OFF at the same time. This bypass switch is normally set to ‘OFF”
(inverter not bypassed), but can be easily moved to “ON” (bypass inverter) allowing the AC loads
to continue to be powered if the inverter or battery bank needs to be serviced/disconnected—
without any rewiring.
Refer to Figure 3-2 (MMPxxx-30D models) or Figure 3-3 (MMPxxx-60S models) to review the
operational modes and power
fl
ow of the AC bypass switch.
All AC loads should be turned off before switching the bypass switch breaker.
Info:
When the bypass switch is ON the connected equipment is directly powered from
the AC source (utility or generator), and will go off if the AC source is disconnected or
turned off.
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