When Utility is abnormal, the UPS will use the battery energy automatically to
energize the Inverter, and turn off the charger and AC/DC converter. The inverter
revert DC to AC to supply energy to the output load connected. The Inverter LED
lights up.
When Utility is back to Normal, the UPS will turn on the AC/DC converter, turn off
DC/DC converter and turn back charger to charging position. It has the same
working principle as figure 4.1.
During a blackout, the UPS will work as illustrated in figure 4.2. When Battery is
low, buzzer will beep continuously till battery is completely cut off. The battery
low protection of the UPS will cut off battery supply before battery drains to avoid
from battery over-drain. The Inverter LED and Bat. Low LED will light up till the
UPS is completely cut off. The UPS will re-start automatically when Utility is
back to Normal. The working principle is the same as figure 4.1.
4.3. Overload Condition
The working principle of the UPS when overloading is illustrated as follows;
Normally, an inrush current is generated when switching on the connected device.
If the UPS is in 105~120% loading, it will switch to bypass mode in 60 seconds. If
The UPS is in 120%-150% loading, it will switch to bypass mode in 10 seconds. If
The UPS is over 150% loading, it will switch to bypass mode immediately. The
Utility LED, Bypass LED and Over Load LED light up. If overload condition is
eliminated by reducing the load to 80%~90%, the UPS will switch back to Inverter
mode automatically.
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