Three-Phase System; Increasing The Power By Paralleling Units; Combined System; Enlargement Of An Existing Installation - Xtender XTS 900-12 User Manual

Studer Innotec SA
Xtender
8.1 T -
HREE PHASE SYSTEM
Three Xtenders of the same voltage (power or type can be different) can be used and combined in
order to establish a three-phase grid. An example of cabling in three-phase is given at figs. 13.-14 of
the appendix.
When three Xtenders are wired to form a three-phase grid, the wired phases at the input determine
the jumper position for selecting the phase (10). It is vital to determine and select the phase for each
Xtender. If the grid is not available at the input of the master unit (phase 1), all the units of the system
will switch to inverter mode. If only a single-phase source is available, it must be connected to phase
1. The other two phases will therefore be supplied by the other two working units in inverter mode.
8.2 I
NCREASING THE POWER BY PARALLELING UNITS
Up to three Xtenders of same type, power and voltage, can be wired in parallel in order to increase
the system's rated power output. In this configuration, all the AC-In inputs of the Xtender must be
wired. The most recent unit (according to the serial number) in the phase will act as the master and
will decide on the operation or suspension of the units in parallel according to the load. The yield of
the installation is therefore still optimal.
It is possible to deactivate the master/slave mode with the parameter {1547}. In that case, the load
search mode is disabled.
An example of parallel connection is given in fig.12 Appendix 1 and the comments on p.42.
If the current of the source (per phase) is greater than 50A (XTH and XTM) or 16A (XTS), a
protection device must be installed on each of the 2 or 3 devices connected to the same
phase with 50A max (XTH and XTM) or 16A (XTS). If the power source is limited to 50A (XTH
and XTM) or 16A (XTS), only one protection device is enough.
8.3 C
OMBINED SYSTEM
It is possible to combine a three-phase system with 1 or 2 phases made up of 2 or 3 Xtenders in
parallel. An example of cabling is given in fig. 15.
A combination of more than one inverter in only one (or two) phases is also possible. for example, it's
possible to build up one powerful phase for the most single phase consumer and the 2 other phases with
only one Xtender each for the 3 phase (motor) application as in the example fig. 15 Appendix I.
It is therefore possible to combine up to nine Xtenders by running three Xtenders in parallel in a three-
phase grid. Examples of cabling are given in figs. 16 to 18 Appendix 1 and the comments on p. 42.
8.4 E
NLARGEMENT OF AN EXISTING INSTALLATION
Only subject to compatibility, it is most of the time possible to enlarge an existing installation by
adding one or several inverters in parallel or in a three-phase configuration. The compatibility of the
new units must be checked by providing Studer Innotec the serial numbers of the inverters in the
existing installation.
The inverters connected to the same system must be equipped with the same software
version. Take care to download the latest software version from manufacturer's website
and update all units of the system before the commissioning.
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