Samlexpower Evolution EVO-2212 Owner's Manual - 4.6 Battery Charger Section
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SAMLEX AMERICA INC. | 65
Mode” with the AC power from the Grid / Generator charging the batteries as well as provid-
ing power to the AC loads.
4.5.6 Transfer From Grid / Generator to Inverter
When the unit is operating in “Charging Mode” with the AC power from the Grid / Gen-
erator charging the batteries as well as providing power to the AC loads, the phase and
frequency of Grid / Generator is tracked continuously. In case Grid / Generator fails or is
disconnected, the inverter will be forced into transfer at voltage which is at the same phase
and frequency at which Grid / Generator had been disconnected. Load will be transferred to
the inverter within 16ms. The unit will now work in “Inverting Mode” and the batteries will
start discharging.
4.5.7 Transfer Between Grid and Generator
As discussed in “Transfer from Inverter to Grid/Generator” above, the EVO prioritizes the Grid
over the Generator input. If the EVO is operating with the Generator input active and the
Grid input is restored, the EVO will transfer the load to its Inverter Section, and then transfer
back to the Grid input. Both operations are synchronized and the transfer is at the zero
crossing for a seamless transfer.
4.6 BATTERY CHARGER SECTION
The Battery Charger Section of these units is a powerful, 3/4 Stage Charger. The same Isolation
Transformer and the H-Bridge configuration are used to work in the reverse direction, ie. rectify
the AC voltage from the Primary AC Power Source to PWM controlled low voltage DC to charge
the DC Battery Source. That is why it is called a Bi-directional device. Normal 3-Stage Charging
Mode consists of Bulk, Absorption and Float stages (Default). 4-Stage Equalization Mode consists
of Bulk, Absorption, Equalization and Float. (The Equalization Mode is selectable). Equalization
Mode is desirable for the proper health of Wet Cell Batteries. Further, the charging voltages and
currents are programmable to take care of a wide range of battery types like flooded, AGM, Gel
Cell, Lead Calcium, etc.
Important battery charging features are as follows:
• Adaptive Charging Control
• Dynamic Input Power Diversion Control
• Parallel charging through External Charge Controller
• Temperature compensated charging
Please see details under Section 5 titled “Battery Charging in Evolution Series”.
4.7 AUTO GENERATOR START
Auto Generator Start facility is available for automatic starting of the Generator with the use
of relay contacts (Status Relay) that closes when the battery voltage drops to the programmed
value of Low Battery Alarm (Default 11V / 22V) and resets (opens) when the battery is
recharged and its voltage rises to the programmed value of “Reset Voltage” (Default 12.5V /
25V) . Relay closing and opening signal is fed to optional Generator Auto Start Stop Control
Module which in turn is wired to the Remote Start / Stop connections on the Generator.
When the batteries discharge to the Low Voltage Alarm threshold (Default 11V / 22V), relay
contact in the Status Relay will close and the Generator will be started automatically. The
SECTION 4 |
General Description & Principles of Operations