Xtender XTS 900-12 User Manual
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Studer Innotec SAXtenderUser manual V4.6.0 317.4.4 Protection against battery reverse polarityXTM series Xtenders are protected against reversed polarity by an internal fuse (see chapter 4.5.1 –p. 20). However, reversed polarity can still cause serious damage to the device and it is best to avoidsuch a situation. The XTH series does not contain an internal fuse and therefore requires an externalprotection. Damages due to reversed polarity are not covered by the warranty.7.5 AUXILIARY CONTACTSThe XTH, XTM and XTS, the latter when equipped with the ARM-02 module, have two dry reversingcontacts that are potential-free. The status of the contacts in deactivated mode is indicated by theannotations, N.C. = normally closed and N.O. = normally open. When the contact is activated anindicator light (9) is illuminated. (Maximum contact loads: 230 Vac / 24 Vdc: 16 A or: max. 50Vdc/3A) The behaviour of these contacts can be programmed using the various parameters describedin the remote control RCC-02/-03 user manual and it can be modified by the user/installer.The behaviour of these contacts can be programmed using the various parameters described in theremote control RCC-02/-03 user manual and it can be modified by the user/installer.These dry contacts are programmed by default for the following functions:Contact no. 1 (AUX 1): The contact has a function of automatic start of generator (two wires). Thecontact will be activated when the battery voltage is below a value, during a given time fixed byparameters {1247/48}/{1250/51}/{1253/54}. The contact will be deactivated when the charge cyclehas reached floating {1516}, or when the "Aux. 1 deactivation voltage" {1255} is reached during apredetermined time {1256}.The voltage of the battery is automatically compensated according to the instantaneousbattery current the same way as it is done for compensation of LVD (see sect. 7.3.3– p.30) ifparameter {1191} is activated.Contact no. 2 (AUX 2): alarm contact by default. It is deactivated when the inverter is out of serviceor is working at reduced performance, because of manual control or if there is an operational faultsuch as overload, under-voltage of the battery, over-temperature, etc.If the operator or installer requires different behaviour for the auxiliary contacts, they are both freelyand individually programmable depending on the battery voltage, the output power, the inverterstatus, the internal clock and the Battery state of charge (if BSP module is present) . These settingscan be done with the RCC-02/-03 (remote control unit).The intelligent programming of the auxiliary contacts allows many applications to be consideredsuch as: Automatic start-up of the generator (two or three wires) Automatic load shedding of lower priority loads of the inverter (2 sequences) Global or individual alarm Automatic disconnection (load shedding) of the sourceFor more information on the programming of auxiliary contacts 1 and 2, refer to ourapplication notes available on the Studer web site: www.studer-innotec.com:AN003: Anti-blackout system for grid connected application (Solsafe)AN005: Automatic management of 2 different energy sourcesAN007: Automatic start of a generator7.6 REAL TIME CLOCKThe Xtender (see sect. 9.4 – p. 37) has a real time clock that allows programing the function of theauxiliary contacts according to a time schedule. This clock must be adjusted via the use of the RCC-02/-03 remote control.The XTS is equipped with a full electronic protection device protecting it from accidentalreversal of polarity of the battery. This does not eliminate the need to install a fuse close tothe battery. In case of reverse polarity, the fuse will not be destroyed and the unit will operatenormally after restoring the correct battery polarity. |
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