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R&D – USER MANUAL DT0430-E04
5 UPS IN PARALLEL
5.1 SYSTEM SET-UP
The installation of many UPS in parallel requires creating one or more panels of the single UPS.
The type of panel created guarantees different levels of operation based on the complexity of the adopted
solution.
The typical, normally suggested solution is described below, which guarantee complete operation of the
system. (fig.5.1)
Disconnections are included on all the power lines of the single groups, disconnection of the their return
line and protection of the batteries.
Moreover, it is advisable to set-up a general by-pass for the system, for this purpose implementation of a
functional interlocking device is recommended.
This interlocking device is necessary to prevent damage to the system
The indicated solution permits all the testing operations in the installation and maintenance phases of the
single groups.
The general manual by-pass can be used to isolate the entire system without load supply interruptions.
Standard reserve
Standard mains
Load
BATTERIE INTERNE
I5
BATTERIA
I1
INPUT MAINS
I2
INPUT RISERVA
I3
BY-PASS
I4
USCITA
I4
USCITA
I5
BATTERIA
BATTERIE INTERNE
I3
BY-PASS
I2
INPUT RISERVA
I1
INPUT MAINS
BY-PASS
BATTERIE INTERNE
I5
BATTERIA
I1
INPUT MAINS
I2
INPUT RISERVA
I3
BY-PASS
I4
USCITA
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DISTRIBUTION PANEL
The complexity of the system requires opportune monitoring of the status of each UPS by remote or SNMP
see chap. 1.2.4 page 7
For additional information, see the attached technical report DT0367. (only for parallel systems)