Three-Phase System; Increasing The Power By Paralleling Units - Studer XTH 3000-12 User Manual

STUDER Innotec
Xtender
When multi-unit system is commissioned, the software's version of every units will be
automatically checked and units may refuse to start in case of incompatibility. If so, an
upgrade of every units is be required with the RCC-02/03 and the last software version
available by the manufacturer. (Read the RCC-02 user's manual to perform this
operation).
In Multi-units system every Xtender in the system shares the same battery bank.
The inverters selected must be of the same type and the same rated power output. There is a
shared battery bank.
In these multi-unit systems, the units must be interconnected via a communication bus connected
to the connectors (3) by cable (art. no. CAB-RJ45-2) of a maximum length of 5 metres. Interrupting
this connection in a multi-unit system will lead to the stoppage – after 5 seconds – of all the units in
the system.
Various application examples are described from fig. 12 to fig. 19 of Appendix I.
It is important to read and adhere to the descriptions associated with each of the figures
mentioned above
In multi-unit system, it is not recommended to employ the manual setting {1532} of the
LVD dynamic correction.
In configurations carrying several Xtenders, each unit is controlled independently using the ON/OFF
push button (41). When the on/off control is given via the RCC-02/03 remote control, it is applied
simultaneously to all units.

6.3.1 Three-phase system

Three Xtenders of the same type 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.
When 3 Xtenders are cabled to form a three-phase grid, the cabled 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.

6.3.2 Increasing the power by paralleling units

Up to three Xtenders can be cabled in parallel in order to increase the system's rated power
output. In this configuration, all the ACin inputs of the Xtender must be cabled. 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 consumer's power demand. 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
search mode is disabled.
An example of parallel connection is given in fig.12 Appendix 1 and the comments on p. 32.
26 V.3.1.0 User manual