3.0 Operation; Inverter Mode; Figure 3-1, Power Flow - Inverter Mode (Ms2012/2812/2024/4024/4048) - Sensata Magnum Energy MS Series Owner's Manual

Operation

3.0 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.
3.1

Inverter Mode

When the MS Series is fi rst powered up, it defaults to the OFF mode. The momentary ON/OFF
power switch (Figure 1-1, Item 1) must be lightly pressed to turn the inverter on. Subsequently
pressing this switch alternately turns the inverter off and on.
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 qualifi ed 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.
Searching – When the inverter is fi rst 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 fl ash – blinks once every second).
Info: The factory default value for the Search feature is 5 watts. It can be turned off or
adjusted from 5 to 50 watts using a remote control display.
Inverting – When a load greater than 5 watts is connected to the inverter output, the MS Series
inverts the DC power from the battery and supplies 120 VAC power to your sub-panel. The inverter's
green LED fl ashes once every second (medium fl ash) to indicate it is inverting. The amount of time
the inverter can be inverting and providing power is directly related to the amount of AC loads
that are connected, and the capacity of the battery bank. Refer to Figures 3-1 , 3-2, and 3-3 to
see the fl ow of power from the DC input to the AC output while in Inverter mode.
AC HOT 2 IN
AC HOT 1 IN
AC NEUTRAL IN
AC GROUND
DC
DC NEGATIVE
IN
DC POSITIVE
Figure 3-1, Power Flow – Inverter Mode (MS2012/2812/2024/4024/4048)
Page 45
AC Hot
Transfer Relay
CB3 (30A)
AC
DC
FET Bridge
¹
CB2
Neutral-Ground
Transfer Relay
Power Transformer
© 2016 Sensata Technologies
AC
OUT
AC HOT 2 OUT
AC HOT 1 OUT
VAC
¹
CB1
AC NEUTRAL OUT
VAC
Note¹: Output
breakers only
available on
MS2012-15B,
MS2012-20B,
& MS4048-20B
models.
0
120
VAC
120