36
®
6 Functions and Signals
When Utility is Abnormal or Absent
The operating mode of the UPS under abnormal utility conditions is illustrated as follows.
1. When the utility is abnormal the UPS will direct the battery energy automatically to the Inverter
without delay and turn off the charger and AC/DC converter. The inverter reverts DC to AC to
supply energy to the output load connected without interruption. The
1
2
LED will shine.
2. When the utility returns to normal the UPS will turn on the AC/DC converter, turn off the DC/
DC converter, and switch the charger to charging mode. This is the same operating mode as in
Figure 5.2.
3. During a utility outage the UPS will work as illustrated in Figure 5.3. When the batteries are low
the buzzer will beep continuously until the batteries are completely cut off. The low-battery
protection of the UPS will cut off the battery supply at a preset threshold to avoid over-draining
the batteries.
4. The UPS will restart automatically when the utility is available, with the same status as in Figure 5.2.
Overload Condition
The operating mode of the UPS when overloading occurs is illustrated as follows.
Figure 5.3
Figure 5.4
