Samlexpower Evolution EVO-2212 Owner's Manual page 72

SECTIOn 4 |
general Description & Principles of Operations
off-line uPS (un-interruptible Power Supply) mode:
Off-line uPS Mode is programmed through the remote Control EVO-rC by setting "ONLINE
MODE" [0=Off]. This is the Default Setting. Please refer to sub-heading "ON-LINE / Off-LINE
uPS MODES" at page 22 in the Owner's Manual for remote Control EVO-rC at Appendix A.
In this mode, the AC input from the Grid is the PrIMAry source of AC power and the
batteries / Inverter Section of EVO are Secondary / back-up source of DC-AC power. If
qualified AC input (within the programmed voltage and frequency limits) is available at
the Grid AC input, the Transfer relay will be switched ON (energized), EVO will operate in
"Charging Mode" and qualified AC input from the Grid will be passed through to the AC
output and at the same time, the Internal AC Charger will start charging the battery. If an
external Solar Charge Controller is also connected to the External Charging Terminals (3 and
4, fig 2.1), the internal AC Charger will limit the charging current to a value = (Programmed
Value of Charging Current – Value of Current fed from the external solar charge controller).
When the Grid AC input fails or, is not within the programmed values of voltage and
frequency, the Transfer relay will be switched Off (de-energized), the unit will change over
to "Inverting Mode" and the AC Output will be fed from the internal Inverter Section. When
Grid input is restored, the unit reverts back to "Charging Mode".
4.9 temPerAture SenSor for bAttery chArging
battery Temperature Sensor Model EVO-bCTS (fig 2.5) has been provided to ensure optimum
charging by modifying the charging voltages based on temperature if the battery sees very
wide temperature swings. Temperature compensation can be programmed with the help of
optional remote Control EVO-rC (see Appendix A). range is -3 to -4 mv/ °C/cell (Default is
-4 mv/ °C/cell). Without temperature compensation, the battery life is likely to be drastically
reduced because the battery will be undercharged during cold conditions (will build up
sulfation) or will be overcharged during hot conditions (will boil and lose excessive water).
4.10 PArAllel oPerAtion with eXternAl chArger
The battery Charger Section is able to operate in parallel with another external charging source like
Solar Charge Controller / AC charger with a charging capacity of up to 50 A. The output of the ex-
ternal charging source is routed through this unit and operates in parallel with the internal charger.
The internal charging current is controlled to ensure that the combined current fed to the battery
does not exceed the programmed bulk Charging Current. This improves the life of the battery.
4.11 cooling fAnS AnD over temPerAture Protection
The unit is cooled by convection and by forced air cooling using 2 variable speed cooling fans.
Temperature is sensed at the Power Transformer and h-bridge Power Mosfets / heat Sink. The
fans will be switched ON at specified temperatures measured at the above sense points. The
speed of the fans is increased as the temperature rises. The unit will shut down due to over
temperature if the sensed temperature rises above the specified overheat thresholds. It will
reset automatically after the unit has cooled down to the reset Threshold.
72 | SAMLEX AMErICA INC.