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Inverter is synchronized with the Generator and once synchronization is completed, the load
is transferred instantly (within 1 ms) to the Generator at Zero Crossing of the voltage wave-
form for seamless transfer and for better protection of Transfer Relay contacts. The unit now
operates in “Charging Mode” with the AC power from the Generator charging the batteries
as well as providing power to the AC loads. As the batteries are now being charged by the
Generator, their voltage will rise and at the programmed Reset Voltage (Default 12.5 / 25V),
the Status Relay will open and the Optional Generator Start / Stop Module will shut down the
Generator automatically. The unit will then transfer back to “Inverting Mode”.
4.8 MODES OF OPERATION
4.8.1 Charging Mode
As long as the external AC input power from the Grid/Generator is available and is within the
programmed limits of voltage and frequency, it is passed through to the AC load through the
Transfer Relay Section. At the same time, the Battery Charger Section converts the external AC
input power from the Grid/Generator to DC power to charge the DC Battery Source.
4.8.2 Inverting Mode
If at any instant, the external AC input power from the Grid/Generator is interrupted or is not
within the programmed limits of voltage and frequency, the Transfer Relay is de-energized and
the load is transferred to the Inverter Section and internal battery charging is terminated. This is
called the Inverting Mode.
4.8.3 Power Save Mode
When the unit is operating without any load connected to it, it requires some minimum input
power from the battery to keep all the sections inside the unit alive and ready to deliver power to
the AC load as soon as the load is switched on. This power is called the “No Load Power Draw”
or the “Idle Power” or “Self Power Consumption”. The “No Load Power Draw” of these units
in the Normal Mode is around 25W to 30W. The EVO has a provision to minimize this “No Load
Power Draw”, if required (Applicable only when the unit is in “Inverter Mode”). This is achieved
by enabling the “Power Saving Mode”.
The unit is shipped in default “Enabled” condition
i.e. Power Saving Mode will be active.
Optional Remote Control EVO-RC (see Appendix A)
is required to disable this mode. When this mode is enabled, the unit does not provide continu-
ous output power. A pulsing output power consisting of only 3 cycles of reduced 48 VAC output
voltage that are made available every 0.5 seconds is used to sense if a minimum load is pres-
ent or not.
As continuous power is not being supplied, the “No Load Power Draw” is
reduced to less than 8W.
If a load greater than the programmed value of “Wake-up Point” is
sensed, the unit exits Power Save Mode and starts providing normal continuous output power. If
the load drops to the programmed value of “Enter Point”, the unit once again reverts to Power
Saving Mode. Programmable and Default Values of “Enter Point” and “Wake-up Point” are
shown in Table 6.6. Further details are available in the Owners Manual for the Remote Control
EVO-RC (See Appendix A).
Power Saving Mode should be disabled for the following loads:
•
Low power loads that draw < 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.
SECTION 4 |
General Description & Principles of Operations
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