MODES OF OPERATION
10
10.1 SWITCHING THE UPS ON.
Switch the UPS on by pressing the ON button on the front panel. The Normal Mode LED will light up; allow ten
seconds for the self-teach procedures to run.
When you are sure that the UPS is functioning properly, the various loads may be switched on and work may com-
mence in protected mode.
10.2 SWITCHING THE UPS OFF.
WARNING!
This UPS has been designed to control and maintain the battery charge; therefore only in excep-
tional circumstances are you advised to switch it o completely.
To shutdown the UPS completely, press and hold down the OFF button and take out or disconnect the mains
power supply.
The UPS switches o all the LEDs and is then fully deactivated. If the mains cable is not disconnected, the battery-
charger remains active.
10.3 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 direct-
ly or through the AVR stabiliser which intervenes in cases of voltage peaks. The batteries are constantly recharged.
10.4 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 ashes.
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.
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