GE_UPS_ISG_LPS_3UL_20K_30K_2US_V010.docx
Installation Guide LP33 Series 20 & 30 UL S2
Fig. 4.7.2-1 RPA Parallel System
In order to ensure a correct load sharing between the parallel units, when the load is
supplied by utility, it is recommended to keep the cable size and length from the input
distribution board to the output bus-bar the same for each parallel unit.
Utility Bypass input voltage must be the same for all units, thus avoiding phase shift or
phase rotation problems.
To avoid mutual induction effect, the input cables must be run in separate conduit
from the output cables.
NOTE !
No transformers, fuses or automatic circuit breakers should be inserted
between the unit’s output and the load common bus-bars.
The delivery and installation of fuses and input / output connections of the UPS are at the
customer’s expense, unless agreed otherwise.
NOTE !
It is recommended to provide an additional length of the input/output cables so that
the UPS can be moved for maintenance purpose.
It is recommended to use flexible input/output conductors with suitable length to
admit a sufficient displacement.
4.7.3 Battery over current protection and wire sizing
Please read the safety precautions at the front of this guide carefully, and thoroughly review the
battery manufacturer’s installation and maintenance manual before connecting the batteries to
the UPS.
Choose an appropriate DC fuse or circuit breaker using the current data in the chart below.
Minimum battery cable requirement is based on the current data below.
LPS33U_020-030_RPA system_GE_01US
LOAD
LP33 Series 20 & 30
1
UTILITY INPUT
F1
F2 F3
F4
LP33 Series 20 & 30
2
LP33 Series 20 & 30
3
LP33 Series 20 & 30
4
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