Magnum Energy Magnum Panel (MP Series) - Manual (Page 101)

Page 94 © 2011 Magnum Energy, Inc.
5.0 Operation
5.1 Inverter DC Disconnect Breaker
The Inverter DC Disconnect Breaker(s) 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 positive DC busbar in the MP enclosure. So, if you have installed any optional DC load
breakers, you must turn OFF the DC load breakers to disconnect battery power to the DC loads.
Before switching the inverter DC disconnect(s) OFF, turn all inverters OFF. This is to
protect the inverter and other equipment from failure, and to preserve the breaker contacts.
WARNING: Do not use the inverter 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 inverter DC disconnect to OFF before connecting or disconnecting
the battery bank, to r educe the chance of spark and wear on the connectors.
5.2 Inverter AC Input Breaker
The Inverter AC Input Breaker when switched ON, allows the incoming AC source (generator or
grid) 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 MPSL-30D, MPSH-30D and MPDH-30D models, this breaker is a double-pole 30 amp AC circuit
breaker. On MPSL-60S models, this breaker is a single-pole 60 amp AC breaker.
5.3 Bypass Switch Assembly
The Bypass Switch Assembly consists of the AC output breaker and the inverter bypass breaker, and
is pre-wired in the MP enclosure between the incoming AC source and the inverter load panel (i.e.,
sub-panel). The AC output breaker is mechanically interlocked with the inverter bypass breaker to
prevent both breakers from being switched ON at the same time, but both can be switched OFF
at the same time. The breaker assembly consists of two double-pole 60 amp AC circuit breakers
on MPSL-30D and MPSL-60S models, and two double-pole 125 amp AC circuit breakers on MPSH-
30D and MPDH-30D models.
Refer to Figure 5-2 (60A Bypass) or Figure 5-3 (125A Bypass) to review the operational modes
and power fl ow of the bypass switch assembly.
5.3.1 AC Output Breaker
The AC Output Breaker when switched ON, allows the AC power of the MP/inverter system — either
the total inverter power or pass-thru power (generator or grid) — to be connected to the AC loads.
With this breaker OFF, the AC loads connected to the output of the MP enclosure are disconnected
from power and can be serviced.
5.3.2 Inverter Bypass Breaker
The Inverter Bypass Breaker allows the inverter loads to continue to be powered by the incoming AC
source (generator or grid) if the inverter or battery bank system needs to be serviced/disconnected
– without any re-wiring.
The bypass breaker is normally set to OFF to allow the incoming AC source to be connected to the
inverter’s AC loads “through the inverter”. It can easily be switched ON to “bypass” the inverter
and allow the AC loads to be powered by the incoming AC source directly.
Info: If possible, before switching the bypass breaker ON, turn off all AC loads so you
are not switching the breakers under load – to reduce wear on the breaker contacts.
Info: When the bypass breaker is ON, the connected AC loads/equipment are
directly powered from the AC source (generator or grid). If the incoming AC source is
disconnected or turned off, the connected AC loads/equipment will also go off.