Xtender XTS 900-12 User Manual
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Studer Innotec SAXtenderUser manual V4.6.0 348.1 THREE-PHASE SYSTEMThree Xtenders of the same voltage (power or type can be different) can be used and combined inorder to establish a three-phase grid. An example of cabling in three-phase is given at figs. 13.-14 ofthe appendix.When three Xtenders are wired to form a three-phase grid, the wired phases at the input determinethe jumper position for selecting the phase (10). It is vital to determine and select the phase for eachXtender. If the grid is not available at the input of the master unit (phase 1), all the units of the systemwill switch to inverter mode. If only a single-phase source is available, it must be connected to phase1. The other two phases will therefore be supplied by the other two working units in inverter mode.8.2 INCREASING THE POWER BY PARALLELING UNITSUp to three Xtenders of same type, power and voltage, can be wired in parallel in order to increasethe system’s rated power output. In this configuration, all the AC-In inputs of the Xtender must bewired. The most recent unit (according to the serial number) in the phase will act as the master andwill decide on the operation or suspension of the units in parallel according to the load. The yield ofthe installation is therefore still optimal.It is possible to deactivate the master/slave mode with the parameter {1547}. In that case, the loadsearch mode is disabled.An example of parallel connection is given in fig.12 Appendix 1 and the comments on p.42.8.3 COMBINED SYSTEMIt is possible to combine a three-phase system with 1 or 2 phases made up of 2 or 3 Xtenders inparallel. 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’spossible to build up one powerful phase for the most single phase consumer and the 2 other phases withonly 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 ENLARGEMENT OF AN EXISTING INSTALLATIONOnly subject to compatibility, it is most of the time possible to enlarge an existing installation byadding one or several inverters in parallel or in a three-phase configuration. The compatibility of thenew units must be checked by providing Studer Innotec the serial numbers of the inverters in theexisting installation.If the current of the source (per phase) is greater than 50A (XTH and XTM) or 16A (XTS), aprotection device must be installed on each of the 2 or 3 devices connected to the samephase with 50A max (XTH and XTM) or 16A (XTS). If the power source is limited to 50A (XTHand XTM) or 16A (XTS), only one protection device is enough.The inverters connected to the same system must be equipped with the same softwareversion. Take care to download the latest software version from manufacturer’s websiteand update all units of the system before the commissioning. |
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