78 | SAMLEX AMERICA INC.
(a) When operating as an inverter, the current carrying conductor of the Inverter Section that is connected to
the Output Neutral terminal of EVO is bonded to the metal chassis of EVO by the “Output Neutral to Chassis
Ground Bond Switching Relay” [RY.2 in Fig 4.1]. As the metal chassis of EVO is in turn bonded to the Earth
Ground (in shore installations) or to the RV Ground (chassis of the RV) or to the Boat Ground (DC Negative
Grounding Bus Bar and the Main AC Grounding Bus Bar are tied together in a boat and this is called the
“Boat Ground”), this current carrying conductor of the Inverter Section (connected to the output terminal)
will become the Grounded Conductor (GC) or the Neutral of the Inverter Section.
(b) When in Charging Mode, the Neutral conductor of the AC input source will be connected to the Output
Neutral terminal of EVO. At the same time, the “Output Neutral to Chassis Ground Bond Switching Relay”
[RY.2 in Fig 4.1] will unbond (disconnect) the Output Neutral connector of EVO from the metal chassis of
EVO. This will ensure that the Grounded Conductor (GC) i.e. the Neutral of the AC input power source 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.
(c) Disabling Neutral to Ground Bond: In some applications, the Output Neutral of EVO 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 Male/Female Quick Disconnect located in the AC wiring compartment.
[Please see (i) 27, Fig 3.9.2(a) and (ii) 27 in Figs 4.1]
Please read the following on-line White Papers for more details at www.samlexamerica.com (Home > Support >
White Papers):
- “Neutral to Ground 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 40A* 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. (*Refer to Note 2 under Legend for Fig 4.1)
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.
SECTION 4 | General Description & Principles of Operation
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