66 | SAMLEX AMErICA INC.
“GS DETECT TIME” (0-600 sec; Default 10 sec)]. On changing over to “Charging Mode”,
qualified AC input from the Grid / Generator is passed through to the AC Output and at the
same time, the Internal AC Charger starts charging the battery. If an external charger 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 charger). When the battery has been re-charged either fully
through complete, 3-Stage Charging algorithm (Option 1) or, for a programmed specified
time period (Option 2), the Transfer relay will be switched Off (de-energized), charging will
stop and the unit will change over to “Inverting 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 Section 4.4 at 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).
Please read white Paper titled “batteries, Chargers & Alternators” available
online at www.samlexamerica.com (home > Support > white Papers) and Section 5
titled “battery Charging in eVo
TM
Series” for more details.
4.10 PArALLeL oPerAtion with eXternAL ChArge ControLLer
The battery Charger Section is able to operate in parallel with external charger with a charging
capacity of up to 50 A. The output of the external 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 Cur-
rent. This improves the life of the battery. Please see Section 5.4 for more details.
4.11.1 Cooling Fans
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.
4.11.2 over temperature Protection
refer to fault Messages and Troubleshooting Guide at Table 7.1 of the attached Owner's Manual for
remote Control EVO-rC at Appendix A. The unit goes to fault Mode and shuts down due to over
temperature sensed at the Main Power Transformer and the Heat Sink for the Power Mosfets: fault
messages and temperature thresholds for shut down and auto-reset are as follows:
•
“transformer over heat!” :
Shut down at 150C and auto-reset at 80C
•
“heat sink over heat!” :
Shut down at 70C and auto-reset at 40C
4.11.3 Automatic reduction of Charging Current in higher Ambient temperatures
In order to protect against over temperature shut down when operating in higher ambient
temperatures of 50C to 60C, the charging current is automatically reduced as follows based on
temperature sensed at the Power Transformer and at the Heat Sink for the Power Mosfets:
•
Power transformer:
In cast the temperature is >130C, the charging current is reduced by
4A (EVO-2212E) / 20A (EVO-3012E) / 1A (EVO-2224E) / 5A (EVO-4024E) every 10 sec
SECTIOn 4 |
general Description & Principles of Operations
