Samlex EVO Series Manual

66 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 67
4.8.4 Power Saving Mode - Transfer Characteristics in Grid / Generator Mode
• Transfer from Grid / Generator to Inverter: If qualied Grid or Generator AC input
power is available (its voltage and frequency are within the programmed range), the
Transfer Relay remains energized and the AC input power is passed through to the
load and at the same time, the unit operates as a battery charger. If AC input power
from Grid / Generator fails or is not qualied (its voltage and frequency are not within
the programmed range), the Transfer Relay is de-energized and the load is transferred
to the inverter. When this transfer takes place, the inverter initially operates in Normal
Mode. If the AC load was greater than the programmed value of “Wake-up Point”,
the inverter continues in Normal Mode. However, if it sees a load less than the
programmed value of “Enter Point” for around 5 sec, it enters Power Saving Mode.
• Transfer from Inverter to Grid / Generator: As soon as qualied AC input power
from Grid / Generator is available, the inverter will exit Power Saving Mode and will
switch over to Normal Mode. This switch over is necessary for synchronizing the AC
output of the inverter with the AC input before transfer (Synchronization can not be
carried out with pulsing wave form during Power Saving Mode). After synchronization
is completed, the load is transferred to the Grid/Generator at zero crossing of the
voltage waveform.
4.8.5 Off-Line/On-Line Modes
The unit is able to operate in two modes – Off-Line Mode (Default) and On-Line Mode. Off-
Line Mode is the Default Mode. Mode can be changed to On-Line Mode through optional
Remote Control Model EVO-RC (Please see Section 4.4 in the attached Owner’s Manual for
EVO-RC – Appendix A)
• Off-line Mode (Default Mode): In this Mode, PRIORITY is given to the AC input fed
from the Grid / Generator Inputs. This is the Default Mode.
If qualied AC input (within the programmed voltage and frequency limits) is available
at the Grid / Generator AC inputs, Transfer Relay energizes and the unit operates in
“Charging Mode” and qualied 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,
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
Grid / Generator AC input fails or is not within the programmed value of voltage and
frequency, the Transfer Relay is de-energized, the unit changes over to “Inverting Mode”
and the AC Output is fed from the internal Inverter Section. When Grid / Generator
input is restored, the unit reverts back to “Charging Mode”.
• Online Mode: In this mode, PRIORITY is given to the Inverter Section. This mode has
to be programmed through the optional Remote Control EVO-RC. Please see details at
Section 4.4 of the attached Owner’s Manual for EVO-RC (Appendix-A).
Even if qualied AC input (within the programmed voltage and frequency limits) is
available at the Grid / Generator AC inputs, the unit always operates in “Inverting
Mode” and AC output is provided by the Inverter Section as long as the battery is
in charged condition above the “LOW VOLT ALARM” threshold. When the battery
discharges to the programmed value of “LOW VOLT ALARM” threshold [12V Version:
9.50V to 12.50V (Default 11.0V); 24V Version: 19.00V to 25.00V (Default 22.00V)] ,
Transfer Relay energizes and the unit changes over to “Charging Mode” and qualied
AC input from the Grid / Generator is passed through to the AC Output and at the same
SECTION 4 | General Description & Principles of Operations