Lp-11U Series: 2 / 3 / 4 Parallel Operating Units - Additional Info; Notes Concerning Installation Of A Parallel System - GE Digital Energy LP 11U Installation & User Manual

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4.5.6 LP 11U series: 2 / 3 / 4 parallel operating units – additional info
The RPA option (Redundant Parallel Architecture) allows you to create a redundant UPS system in which 2, 3
or 4 LP-U units operate in parallel. The following should be considered when installing units in parallel.
This section gives aditional information on:
- installation (4.5.6.1)
- start-up (4.5.6.2)
- use / maintenance (4.5.6.3)

4.5.6.1 Notes concerning installation of a parallel system

1. All inputs of the UPSs must be supplied from the same phase. This is to enable bypass operation of the
parallel system. All inputs must be individually protected by fuses in the installation. The values of these
fuses should correspond to the values mentioned in section 4.5 table 1.
2. All outputs must be connected together, supplying the load. It is advised to install switches (S 1-4, fig. 17)
in the output wiring, in order to be able to isolate a unit from the remaining system for service and
maintenance purposes. It is advised to make a Neutral-to-Ground bounding in the output junction.
3. The diameter of input and output cables must be according to the table in the installation drawings (see
appendix). Cables with different diameters can cause tripping fuses in the UPS and/or the installation.
4. The length of all input cables from the input junction (Li, fig. 17) to the UPS inputs should be equal. The
same applies to the cables from the outputs to the output junction (Lo, fig. 17). The minimum length of
the input as well as the output cables is 3 meters / 10 feet.
F 1-4
DISTRIBUTION
FUSE VALUES
ACCORDING TO
TABLE 1
IN
LP-UPS
RPA CARD
OUT
S 1-4
SWITCH ALLOWS
ISOLATION OF A UNIT
FROM THE SYSTEM
Li/Lo: LENGTH OF I/O WIRING
- EQUAL FOR EACH UPS
- MINIMUM 3 METERS / 9.8 FEET
LX: OPM_LPU_11U_5K0_10K_1US_V030
1-PHASE 3-WIRE INPUT
BUS
TERMINATOR
IN
LP-UPS
RPA CARD
OUT
MAKE
NEUTRAL-TO-GROUND
BOUNDING HERE
Figure 17. Installation of parallel operating LP-U UPSs
19
Digital Energy
INPUT JUNCTION
IN
LP-UPS
RPA CARD
OUT
OUTPUT JUNCTION
TO LOAD
GE DE LP 11U UPS: Installation / User Manual 3.0 (US)
™
LP Series
BUS
TERMINATOR
IN
LP-UPS
RPA CARD
OUT
YELLOW NETWORK
CABLES AS DELIVERED
WITH THE UPS