Critical Power
Modifications reserved
Page 21/92
GE_UPS_USM_TLE_SUL_M62_1M0_2US_V010.docx
User Manual
TLE Series 625 - 750 - 1000 UL S2
4.4
UPS PARALLELED ON THE SAME BATTERY
NOTE !
A Parallel System with a Common Battery for two or more UPS (max. 3 units), requires
a particular installation and adequate setting of some parameters, (accessible only
through password), and can therefore only be done by a GE SERVICE PERSONNEL.
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 –
Rectifier
Inverter
Automatic Bypass
Utility Input
Load Bus Bar
External Battery Fuse
External Battery
Pay attention to the following recommendations:
•
The units delivered for this functioning mode needs a special parameters 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 (4) 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
(6) on each line connecting the
Rectifiers
to the common
Battery
for maintenance / safety reasons (see
Installation Guide
to
Section 4.8.2
).
•
In case a unit must be powered down for maintenance, switch-OFF the concerned unit before open
the DC fuses /
MCB
on the
Battery
line (6).
•
It is recommended to connect an external NO free contact
“Battery Fuses”
to the UPS and to enable
the function by setting the parameter (see
Section 9.1
).
•
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.
•
The parameters enabling the
Battery test
, both manual and automatic, must be set in the same
mode on all the units sharing a
Common Battery
.
•
Do not connect the temperature sensor for automatic
battery floating voltage
compensation.
•
Do not enable the function
Boost charge
.
