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34006451EN/AC - Page 8
Characteristics
Installation with parallel frequency converters I
Installation with parallel UPSs with a centralised SSC
The table below serves as an example for an installation comprising up to four frequency converters or four parallel UPSs
with a centralised SSC.
– for installations with redundant units, take into account only the units required to supply the load power
(e.g. for an installation made up of 3 parallel-connected rectifier-inverter cubicles, one being redundant, only 2 rectifier-
inverter cubicles are used to determine Mains 2 and load currents and cable cross-sections);
– this table has been drawn up for rated phase-to-phase Mains 2 and load voltages of 415 V and full rated load with a power
factor of 0.9. For voltages of 380 or 400 V, multiply the indicated currents by 1.09 and 1.04 respectively, then modify the cable
cross-sections accordingly if necessary.
The cable cross-sections in this table are for the parts illustrated in bold on the following block diagrams (installation examples,
figures 1 and 2).
Parameters for Mains 2 and load cables for an installation comprising frequency converters or parallel
UPSs with a centralised SSC.
rated
inverter
output
in kVA
number of
parallel-connected
inverters
total UPS
rated output
in kVA
Mains 2 or load
line current
in Amps
cable
cross-section (1)
in mm²
800 2 1600 2310
Please consult us*
3 2400 3465
Please consult us*
4 3200 4620
Please consult us*
900 2 1800 2598
Please consult us*
3 2700 3897
Please consult us*
4 3600 5196
Please consult us*
(1) cable cross-sections are given for copper conductors of the U1000 R02V type (increase by 30 % for aluminium conductors).
They are calculated according to permissible temperature rise and allow for line voltage drops over a maximum length of 100 m.
For greater lengths, the cross-sections should be chosen to limit voltage drops to 3 %.
* NF C 15-100 authorizes a maximum of 4 cables per phase.
Fig. 1
Fig. 2
mains 1
load
mains 1
mains 1
inverter 1
inverter 2
inverter 3
mains 1
load
mains 1
mains 1
inverter 1
inverter 2
inverter 3
mains 2
static
switch
cubicle