Product Manual

72 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 73
carrying conductor of the Inverter Section (connected to the output terminal) will become the
Grounded Conductor (GC) or the Neutral of the Inverter Section.
•
When in Charging Mode, the Neutral conductor of the Grid power/Generator will be con
-
nected to the Output Neutral terminal of EVO
TM
. At the same time, the “Output Neutral
to Chassis Ground Bond Switching Relay” (RY2 in Figs 4.1) will unbond (disconnect) the
Output Neutral connector of EVO
TM
from the metal chassis of EVO
TM
. This will ensure that the
Grounded Conductor (GC) i.e. the Neutral of the Grid power/Generator is bonded to the
Earth Ground at one single point at the location of the AC Power Distribution System of the
Marina/RV Park/Shore Power.
• Disabling Neutral to Ground Bond: In some applications, the Output Neutral of EVO
TM
may be required to remain isolated from the chassis/Ground at all times. For this, automatic
Output Neutral to Ground bond can be disabled by disconnecting the Insulated Male/Female
Quick Disconnect located in the AC wiring compartment of EVO-1212F-HW / 1224F-HW.
[Please see (i) 27, Fig 3.9.2(a) and (ii) 27, Fig 4.1]. In EVO-1212F / 1224F, this Insulated Male
/ Female Quick Disconnect is accessible after opening the top cover of the unit.
Please read the following on-line White Papers for more details at www.samlexamerica.com
(Home > Support > White Papers):
-
“Neutral to Gr
ound Switching in RV and Marine Applications”
4.4.2 Operation of Transfer Relay and Output Neutral to Chassis Ground
Bond Switching Relay
Refer to Schematic at Fig 4.1.
The Bi-directional Transformer is used as follows:
o Feeds AC output from the Inverter Section when Grid power is not available.
o
Feeds Grid / Generator power to the Battery Charger Section when Grid / Generator
input is available.
Switching of Hot Output (OUTPUT LINE)
o
30A rated SPDT Relay RY1 (Fig 4.1) is used to switch the Hot Output Connector
(OUTPUT L) to either the Inverter Section or to Grid / Generator.
o When Grid / Generator input Power is available, Relay RY1 (Fig 4.1) will be energized and
contact 4 switches over to contact 5. The Bidirectional Transformer works as a battery
Charger. The Hot AC input from Grid / Generator (INPUT L) is fed to the Hot input of the
Bi-directional Transformer for battery charging and at the same time, it is passed through
to the Hot Out (OUTPUT L) for powering the AC loads.
o When Grid / Generator power fails, Relay RY1 (Fig 4.1) will be de-energized and contact
4 switches back to contact 3. Output from the Inverter Section is fed to the Bi-directional
Transformer and onwards to the Hot Out (OUTPUT L) for powering the AC loads.
Switching of Bonding of Output Neutral to Chassis Ground
o 30A 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
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
SECTION 4 | General Description & Principles of Operations