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i
INFO
Power Saving Mode should be disabled for the following loads:
• Low power loads that draw less than 5W e.g. digital clocks, satellite receivers, phones / answering
machines etc.
• Audio / video / computing devices that consume normal operating power > 50 W but draw less than
5W on entering Sleep Mode when switched off or , when no activity is seen for a specified time.
• Some devices like small fluorescent lights, refrigerators, microwaves, computers and other sophisticated
electronics may not be detected when scanned by the output voltage characteristics of the Power
Saving Mode
[Output voltage consisting of 3, 60 Hz cycles of “reduced 48VAC load search voltage”
every 0.5 sec]
.
These devices have power supplies in their front end that do not present a load until
the full 120/240VAC line voltage is available.
4.8.4 Power Saving Mode - Transfer Characteristics
• Transfer from AC Input Source to Inverter:
If qualified 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 qualified
(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 qualified 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.
4.8.5 Normal (Off-Line), On-Line and Charger Only Modes
EVO-4248SP 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.
ii.
Option “1=On-Line”
iii.
Option “2=Charger Only”
4.8.5.1 Option “0=Normal”
(Default)
. This option is also called “Off-Line UPS Mode”
(UPS stands for
U
n-
interruptible
P
ower
S
upply)
. 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 qualified AC input
(within the programmed
voltage and frequency limits)
is available, the EVO™ will operate in “Charging Mode” and qualified 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:
SECTION 4 |
General Description & Principles of Operation
Summary of Contents for Evolution EVO-4248SP
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