Modifications reserved
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OPM_LPS_3UO_80K_M10_1US_V010.doc
User Manual
LP33 Series 80 & 100 UL S1
4.4 UPS PARALLELED ON THE SAME BATTERY
NOTE !
A parallel system with a
Common Battery
for two or more
UPS
, requires a particular
installation and adequate setting of some parameters, (accessible only through
password), and can therefore only be done by a QUALIFIED GE ENGINEER.
Usually each
UPS Unit
runs with its own
Battery
.
In case of parallel units running with a
Common Battery
(max. 4 UPS - see
Fig. 4.4-1
), the sharing circuit
between the individual
UPS
is integrated in the communication bus of the system in order to assure an
equal sharing of the
Rectifiers
output currents.
Fig. 4.4-1 Diagram RPA system with UPS on common battery
1 –
2 –
3 –
4 –
5 –
6 –
7 –
8 –
Rectifier
Inverter
Automatic Bypass
Manual Bypass
Mains Power
Load Bus Bar
External Battery Protection
Battery
Pay attention to the following recommendations:
•
The units delivered for this functioning mode need a special parameter setting, so they must be
prepared in advance before the installation.
•
The installation must be performed only with the UPS system completely shut down.
•
The AC
Rectifiers
input power (5) must be the same, with clockwise phase rotation for each unit.
•
Each
Rectifier
must be set for the same floating DC voltage and the same
Battery
current limitation.
•
It is mandatory to install the fuses /
MCB
(7) on each line connecting the
Rectifiers
to the common
Battery
for maintenance / safety reasons (see
Section 4.7.2
).
•
In case a unit must be powered down for maintenance, switch-OFF the concerned unit before
opening the DC fuses /
MCB
on the
Battery
line (7).
•
If an emergency generator set supplies the UPS, and the free contact
“Generator ON”
is connected
to the
Customer Interface
, connect a separate NO free contact on each parallel unit.
•
Do not connect the temperature sensor for automatic
battery floating voltage
compensation.
•
Do not enable the function
Boost charge
.
