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NeTYS 400-1000 VA Product Manual
4. OPERATING MODES
NORMAL MODE
When mains power is available and the voltage falls within the acceptable range, the NORMAL MODE LED on
the front panel remains on permanently. In this mode, the loads are powered from the mains power supply
either directly or through the AVR stabiliser which intervenes in cases of voltage peaks. The batteries are
constantly recharged.
BATTERY MODE
The UPS switches automatically to this operating mode when mains power fails (spikes or lengthy black-
outs) or if the mains is at a value considered to be dangerous; the consumers are powered using the energy
stored in the batteries converted to AC voltage through the inverter.
In this mode, a slow intermittent acoustic alarm sounds, while the BATTERY MODE LED on the front panel
flashes.
In cases of prolonged mains failure, the UPS powers the consumers until it shuts down when the batteries
are fully depleted (see the chapter on COMMUNICATION for orderly shutdown via software).
Just before shutdown when the battery charge runs out fully, low battery charge is signalled via a rapid
intermittent acoustic alarm.
The UPS automatically returns to normal operating mode about two seconds after the mains power is
restored. The time taken to transfer from normal to battery mode and vice-versa is imperceptible to the load.
OVERLOAD
The UPS can power loads up to the power rating declared on the machine’s data plate; once this limit is
exceeded, the machine goes into overload condition.
Overloads are signalled by a rapid sounding acoustic alarm
.
Warning: Significant overloads could cause permanent damage to the UPS!
Avoid connecting laser printers that generate absorption peaks liable to cause overloads on the UPS.
! SECTION 1
8
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