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ELECTRICAL
Inverters
The inverter modifies direct current to alternating current to
provide power to specified appliances and entertainment
systems. The inverter performs this action by using
a transformer to increase the voltage and modify the
higher voltage into a useable alternating current power.
For this function to occur, the inverter must be powered,
set up, and turned on. A variety of inverters are used by
Newmar; however, most have a control panel located in the
overhead cabinet with other switches and controls.
Converters
A converter transforms alternating current or shore line
power 120 volts; to low-voltage direct current to provide
power to the coach’s 12 volt house and chassis batteries.
This function occurs automatically when 120 volts are
supplied to the converter. Converters are usually located
in the cord compartment of coaches that do not have a
inverter/converter combination unit.
Inverter/Converter
Combination Units
The inverter/converter combination provides battery
charging and allows the 120 volt power from shore power
or the generator to pass through the inverter. The inverter
performs this charging action by using the transformer to
decrease the voltage and rectify the alternating current
into useable direct current voltage. This is regulated by
internal-sensing circuitry based upon the battery bank’s
state of charge and several other factors, depending on
the coach’s particular inverter brand and type.
This type of unit also performs the inverter function. For
this function to occur, the inverter must be powered, setup
and turned on. A variety of combination units are used by
Newmar; however, most have a control panel located in
the overhead cabinet with other switches and controls.
Magnum MagnaSine 2000 and 2800 Watt Pure Sine
Inverter Operation (Models: MS Series)
This article provides basic operation instructions for a Magnum MagnaSine 2000 and 2800 Watt Pure Sine Inverter
(Models: MS Series).
Operation
The MS Series inverter has two normal operating
routines: Inverter mode, which powers your loads using
the batteries, and Standby mode, which transfers the
incoming AC current (i.e., utility power or a generator)
to power your loads and to recharge the batteries. This
inverter also includes an extensive protection circuitry to
shut down the inverter under certain fault conditions.
Inverter Mode
POWER ON/OFF SWITCH
The inverter can be turned on and o ff by lightly pressing
and releasing the Power ON/OFF switch on the front of
the inverter. When the inverter is first connected to the
batteries, or when its automatic protection circuit has
turned the inverter o ff , the ON/OFF switch will need to be
pressed to start the unit or reset per Magnum’s Owner
manual. Once the inverter has been turned on, pressing
the Power ON/OFF switch alternately turns the inverter on
and o ff .
WARNING
!
The Power ON/OFF control switch does not turn on
or o ff the charger feature, or remove pass-thru power.
If AC power (utility or generator) is connected and
qualified on the AC input, this AC power will also be
available on the AC output and is not controlled by
the Power ON/OFF switch.
The factory default value for the Search feature is 5
watts. It can be turned o ff or adjusted from 5 to 50
watts using a remote control display.
IMPORTANT
!
INVERTER OFF
When the inverter is o ff , no power is used from the
batteries to power the AC loads, and the status LED will
be o ff . If AC power from an external source (utility or
generator) is connected and qualified on the inverter’s AC
input, this AC input power passes through the inverter to
power the AC loads. However, if this AC power is lost, the
AC loads are no longer powered because the inverter is
o ff . When the inverter is turned on, it operates either by
“searching” or “inverting”, depending on the connected
AC loads.
SEARCHING
When the inverter is first turned on, the automatic Search
feature is enabled. This feature conserves battery power
when AC power is not required. In this mode, the inverter
pulses the AC output looking for an AC load (i.e., electrical
appliance). Whenever an AC load (greater than 5 watts)
is turned on, the inverter recognizes the need for power
and automatically starts inverting. When there is no load
(or less than 5 watts) detected, the inverter automatically
goes back into Search mode to minimize energy
consumption from the battery bank. When the inverter is
searching, the inverter’s green LED fl ashes (medium flash
– blinks once every second).