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ELECTRICAL
Inverters and Converters
Provides basic information about the role and operation of inverters, converters, and inverter/converter
combination units.
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 off 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 off, 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 off.
WARNING
!
The Power ON/OFF control switch does not turn on
or off 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.
INVERTER OFF
When the inverter is off, no power is used from the
batteries to power the AC loads, and the status LED will
be off. 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
off. When the inverter is turned on, it operates either by
“searching” or “inverting”, depending on the connected
AC loads.
7. Turn off major appliances (such as air conditioners,
televisions, and other electronics that may
excessively load the generator or may be sensitive
to initial voltage surges).
The hour meter installed on the generator calculates the
number of running hours of the generator motor. This is
used for maintenance schedules. Regular oil changes
and other maintenance performed at the prescribed
intervals will greatly extend the life of your generator.