4 2
Chapter 5 Installation and Wiring
y
To extend battery backup time, you can connect several external battery cabinets to the
UPS. Please note that the number of the batteries in each paralleled external battery
cabinet must be the same.
UPS
20 kVA
30 kVA
40K kVA
60K kVA
Circuit Breaker Rating Current
75A
125A
150A
225A
Battery Cable
1 AWG
(35 mm
2
)
1/0 AWG
(50 mm
2
)
4/0 AWG
(95 mm
2
)
250 Kcmil
(120 mm
2
)
Battery Fuse
80A
125A
150A
225A
y
The breaker must be a 3-pole non-fuse DC breaker with characteristics of 1-pole 125Vdc,
2-pole 300Vdc and 3-pole 450Vdc. Follow
Figure 5-16
to install a 3-pole non-fuse DC
breaker and fast-acting fuses between the UPS and the external battery cabinet.
(Figure 5-16: A 3-pole Non-fuse DC Breaker and Fast-acting Fuses Installation)
-
N
+
-
N
+
External
Battery
Cabinet
UPS
3-pole Non-fuse
DC Breaker
Fast-acting
Fuses
y
The parallel UPSs can connect with common batteries.
y
Battery Alarm
When the batteries connected to the UPS have the following problems, the UPS system
will sound one of the following alarms.
No.
Battery Status
Alarm
1
Battery Test Fail
Sounds once every 2 seconds
2
Battery Low Warning
Sounds once every 0.5 second
3
Battery Low Shutdown
Long beep (5 seconds)
4
Battery Missing
Sounds once every 2 seconds
