Magnum-energy MS Series User Manual download pdf (Page 53)

Page 44

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 (Item 1, Figure 1-1) must be lightly pressed to turn the inverter ON. Subsequently

pressing this switch alternately turns the inverter OFF and ON.

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 will pass through the inverter to power

the AC loads. However, if this AC power is lost, the AC loads will no longer be 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 is provided to conserve 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 (fast).

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 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 2 seconds (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 Figure 3-1 to see the ﬂ ow

of power from the DC input to the AC output while in the Inverter mode.

VAC

120

VAC

120

VAC

INV

OUT

Neutral-Ground

Transfer Relay

AC Hot

Transfer Relay

AC HOT 1 IN

AC HOT 2 IN

CB3 (30A)

AC NEUTRAL IN

AC GROUND

Power Transformer

FET Bridge

AC HOT 1 OUT

AC HOT 2 OUT

CB2

(optional)

CB1

(optional)

DC POSITIVE

DC NEGATIVE

AC NEUTRAL OUT

Figure 3-1, Power Flow - Inverter Mode

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Magnum-energy MS Series User Manual Page 53

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