35
5.3 When Utility is Abnormal/Absent
The working principle of the UPS under Utility abnormal condition is illustrated
as follows
：
1. When 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 converts the DC to AC to supply energy to the output connected
load without interruption. The
LED will be illuminated
.
2. When Utility is back to Normal, the UPS will turn on the AC/DC converter, turn
off the DC/DC converter and switch the charger to charging mode. It has the
same working principle as figure 5.2.
3. During a utility outage, the UPS will work as illustrated in figure 5.2. When
Battery is low, the audible alarm will beep continuously until the battery
reaches low battery cut off. The battery low protection of the UPS will cut off
battery supply after a preset threshold to avoid the battery from over-drain.
The
&
(Battery Low) LED
‟s will light up until the UPS is completely cut
off. The UPS will re-start automatically when Utility is available.
Fig 5.3
Summary of Contents for UniStar C
Page 1: ...Form No 003 2308 Rev C 1K 2K 3K UniStar C Intelligent True On Line UPS User Manual ...
Page 9: ...8 3 2 Rear Panel Descriptions 120V 1KVA 10 8 7 1 2 3 5 4 6 2KVA 3KVA ...
Page 19: ...18 4 3 Set up Tower Configuration Setup Step 1 Power Module Battery Module Step 1 ...
Page 20: ...19 Rack Mount Configuration Setup Step 1 Step 2 Step 3 ...
Page 21: ...20 Step 4 Step 5 ...
Page 27: ...26 Q1 Q2 R1 R2 S ...
Page 28: ...27 T U1 U2 U3 V ...
Page 32: ...31 4 4 3 Battery Replacement Step 1 Step 2 ...
Page 33: ...32 Step 3 Step 4 1KVA 2K 3KVA ...
