
3: Installation
34
TS_619_00 PW9000DPA S2 User Manual 13/3/17
Each UPS module must be connected to between 42-50 12V battery blocks that are connected in series to form a battery
string of the required voltage and capacity. Within the UPS cabinet the battery string is connected to three power terminals
annotated ‘+’ ‘–’ and ‘N’. The plus and minus terminals are connected to the battery string positive and negative
extremities, and the ‘N’ terminal is connected to a point exactly mid-way along the battery string. For this reason the
battery string must comprise an even number of blocks.
Two battery configurations are possible – i.e. ‘common battery’ and ‘separate battery’. Figure 3.10 shows the connections
for both configurations using the internal batteries in a DPA-150 cabinet fitted with three UPS modules.
Figures 3.11 and 3.12 show an example of the battery connections when using an external battery system and illustrates
a DPA-250 cabinet with five fitted UPS modules.
Common battery
All the power modules are connected to a
single battery source (although that
source may itself comprise several battery
strings connected in parallel). This
requires ‘common battery’ links to be fitted
to the UPS battery terminal blocks, as
shown.
Separate battery
Each UPS module is connected to an
individual battery string.
Key Point:
If you are installing an external battery cabinet that is not supplied by Uninterruptible Power Supplies
Ltd. you should refer to the manufacturer’s installation manual to ensure that it is contains a suitable number
connections and isolators to provide five individual battery strings.
COMMON BATTERY
SEPARATE BATTERY
S
tr
ing A
+
S
tr
ing B
+
S
tr
ing C
+
S
tr
ing A
N
S
tr
ing B
N
S
tr
ing C
N
S
tr
ing A
-
S
tr
ing B
-
S
tr
ing C
-
S
tr
ing A
+
S
tr
ing B
+
S
tr
ing C
+
S
tr
ing A
N
S
tr
ing B
N
S
tr
ing C
N
S
tr
ing A
-
S
tr
ing B
-
S
tr
ing C
-
Modul
e 1+
Modul
e 2+
Modul
e 3+
Modul
e 1N
Modul
e 2N
Modul
e 3N
Modul
e 1-
Modul
e 2-
Modul
e 3-
Modul
e 1+
Modul
e 2+
Modul
e 3+
Modul
e 1N
Modul
e 2N
Modul
e 3N
Modul
e 1-
Modul
e 2-
Modul
e 3-
Figure 3.10 Internal battery connections (DPA-50 / DPA-150)