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SECTION 4 | General Description & Principles of Operation
4.6.4 Power Saving Mode - Transfer Characteristics
• Transfer from AC Input Source to Inverter: If qualied 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
fails or is not qualied (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 AC Input Source: As soon as qualied AC input power 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 AC Input Source at zero crossing of the voltage waveform.
4.6.5 Normal (Off-Line), On-Line and Charger Only Modes
EVO has 3 modes of operation as follows that can be programmed through programming parameter “MODE” [For
details, see Section 4.4.2.13 in the EVO-RC-PLUS Remote Control Manual]
i. Option “0=Normal” (Default). Also called Off-Line Mode. See details at Section 4.6.5.1 below
ii. Option “1=On-Line”. See details at Section 4.6.5.2 below
iii. Option “2=Charger Only”. See Section 4.6.5.3 below
4.6.5.1 Option “0=Normal” (Default). This option is also called “Off-Line UPS Mode” (UPS stands for Un-
interruptible Power Supply). In this mode, AC input source is the PRIMARY source of AC power and the batteries
/ Inverter Section of EVO is the BACK-UP source of DC-AC power. If qualied AC input (within the programmed
voltage and frequency limits) is available, the EVO will operate in “Charging Mode” and qualied AC input will be
passed through to the AC output and at the same time, the Internal AC Charger will start charging the batteries.
If an external Solar Charge Controller is also connected to the External Charging Terminals (3, 4 in Fig 2.1), the
internal AC Charger of EVO will limit the charging current as follows:
Value of charging current produced by EVO
Charging Section
=
(Programmed value of charging current set by
parameter “BULK CURRENT” [See Section 4.4.2.1
of EVO-RC-PLUS Remote Control Manual] minus
(Value of current fed from the external solar charge
controller)
When AC input fails or, is not within the programmed values of voltage and frequency, the unit will change over to
“Inverting Mode” and the AC Output will be fed from the internal Inverter Section of EVO. When the AC input is
restored, the EVO will revert back to “Charging Mode” to charge the batteries and at the same time, pass through
the AC input to the AC output.
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