SAMLEX AMERICA INC. | 79
Switching of Bonding of Output Neutral to Chassis Ground
o 40A* rated SPDT Relay RY2 (Fig 4.1) is used to switch the bonding of the Output Neutral Connector (OUTPUT
N) to the chassis of the unit. (*Refer to Note 2 under Legend for Fig 4.1)
o When Grid / Generator input power is available, Relay RY2 (Fig 4.1) will be energized and contact 4 switches
over to contact 5. Neutral input from Grid (GRID N) is fed to the Neutral input of the Bi-directional Transformer
for battery charging and at the same time, it is passed through to the Output Neutral (OUTPUT N) for
powering the AC loads. Please note that in this condition, the Output Neutral (OUTPUT N) is isolated from the
chassis of the unit
o When Grid / Generator input power fails, Relay RY2 (Fig 4.1) will be de-energized and contact 4 switches back
to contact 3. Neutral output from the Inverter Section is fed the Neutral of the Bi-directional Transformer and
onwards to the output Neutral (OUTPUT N) for powering the AC loads. At the same time, the output Neutral
(OUTPUT N) gets bonded to the metal chassis of the unit through the mated contacts of the Insulated Male /
Female Quick Disconnect (27, Fig 4.1) located in the AC Wiring Compartment [27, Fig 3.9.2(a)] in EVO-1212F-
HW / 1224F-HW. In EVO-1212F / 1224F, the Insulated Male / Female Quick Disconnect is accessible after
opening the top cover of the unit.
SECTION 4 | General Description & Principles of Operation
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