Critical Power
Modifications reserved
Page 23/146
GE_UPS_OPM_TLE_SCE_M60_M80_1GB_V020.docx
User Manual
TLE Series 600 & 800 CE S1
4.4
UPS PARALLELED ON THE SAME BATTERY
NOTE !
A parallel system with a
Common Battery
for two or more
UPS
(max. 4 units), requires
a particular installation and adequate setting of some parameters, (accessible only
through password), and can therefore only be done by a GE QUALIFIED 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
–
Rectifier
Inverter
Automatic Bypass
Mains 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
Section 5.8.2
).
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 9.2
).
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
.