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OPM_SGS_USM_10K_40K_0US_V010.doc
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Operating
Manual
SG Series
10, 20, 30 & 40 kVA
3.4
RECTIFIERS PARALLELED ON THE SAME BATTERY
A parallel system with a
Common Battery
for two or more
Rectifiers
,
requires a particular installation and adequate setting of some
parameters, (accessible only through password), and can therefore
only be done by a qualified engineer from GE.
Usually each
Rectifier-Inverter Unit
runs with its own
Battery
.
In case of parallel units are running with a
Common Battery
(max. 4 UPS - see
Fig 4.12-1
), the
sharing circuit between individual
Rectifier
is integrated in the communication bus of the
system in order to assure an equal sharing of the
Rectifiers
output currents.
Fig. 3.4-1 Diagram RPA system with Rectifiers on Common Battery
1 –
2 –
3 –
4 –
5 –
6 –
7 –
8 –
Rectifier
Inverter
Automatic Bypass
Manual Bypass
Mains Power
Load Bus Bar
External Battery Fuse
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 must be 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 recommended to install the fuses / MCB (7) on each line connecting the
Rectifiers
to
the common
Battery
for maintenance / safety reasons.
•
In case one must be powered down for maintenance, switch-OFF the concerned unit before
open the DC fuses / MCB on the
Battery
line (7).
•
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 7.1
).
•
If an emergency generator set supply 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 having the
Rectifiers
on
Common Battery
.
•
Do not connect the temperature sensor for automatic
battery floating voltage
compensation.
•
Do not enable the function
Boost charge
(parameter 87).
