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• Transfer Relay K1 will be in de-energized condition, and through its normally
closed (NC) contacts, the Line Sockets of the AC outlets will be connected to the
Line conductor of Grid input for Grid pass-through.
• Ground Switching Relay K2 will also be in de-energized condition and through
its Normally Closed (NC) contacts, the Grounding Sockets of the two AC outlets
will be connected to the metal chassis of the unit
(ii) inverter mode:
If the incoming Grid input fails or if the breaker / switch supplying
the Grid AC outlet is switched off, the unit transfers to Inverter Mode. The follow-
ing is carried out as soon as Grid power failure is detected:
• Battery Charging Section will switch OFF and Green LED “CHARGER” (7, Fig 3.1)
will also switch OFF. The battery will start discharging at current = Power of AC
load(s) in Watts ÷ 10
• Starting of the Inverter will be initiated. Green LED marked “Inverter” (8, Fig 3.1)
will be switched oN.
• Within a time delay of 2 to 3 sec from the time the Grid AC input failed:
• Transfer Relay K1 will be energized, its Normally Open(NO) will close and will
transfer connection of the Line Sockets of the AC outlets from Line conductor
of the Grid input to the Line conductor of the Inverter output
• Ground Switching Relay K2 will also be energized, its Normally Opened (NO)
contacts will close and the Grounding Sockets of the two NeMA5-15r AC
outlets (10, Fig 3.1) will get disconnected from the metal chassis of the unit
and get connected to the internal GfCI circuitry
5.1.2 Stand-alone Battery charger mode / Grid ac pass-through mode
In this mode, the unit is used just as a stand-alone battery charger with additional abil-
ity to pass-through Grid AC to the AC loads, if desired. The unit is fed with 12V battery
power on the DC input side and with 120VAC, 60Hz Grid AC power on the AC input side.
The Inverter is kept in off condition by keeping the Inverter oN/off switch “INVerTer”
(3, Fig 3.1) in OFF position.
As long as 120V Grid AC power is available, the unit operates in this mode as follows:
• Inverter Section will be in OFF condition. Green LED “INVERTER” (8, Fig 3.1) will
be off
• Switch ON the Battery Charger Section by switching the Battery Charger ON/OFF
Switch (2, Fig 3.1) to ON condition. Green LED “CHARGER” (7, Fig 3.1) will be
oN. It will provide 2-Stage Charging of the 12V Lead Acid battery at up to 15A
at Float voltage of 13.8V (See Section 2.5.2 for details)
• Transfer Relay K1 will be in de-energized condition, and through its normally
closed (NC) contacts, the Line Sockets of the AC outlets will be connected to the
Line conductor of Grid input for Grid pass-through.
• Transfer Relay K2 will also be in de-energized condition and through its Nor
-
mally Closed (NC) contacts, the Grounding Sockets of the two AC outlets will be
connected to the metal chassis of the unit
SeCTIOn 5 |
Operation
Summary of Contents for SAM Series
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