Studer Innotec SA
Xtender
User manual
V4.6.0
31
7.4.4
Protection against battery reverse polarity
XTM 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 avoid
such a situation. The XTH series does not contain an internal fuse and therefore requires an external
protection. Damages due to reversed polarity are not covered by the warranty.
7.5
A
UXILIARY CONTACTS
The XTH, XTM and XTS, the latter when equipped with the ARM-02 module, have two dry reversing
contacts that are potential-free. The status of the contacts in deactivated mode is indicated by the
annotations, N.C. = normally closed and N.O. = normally open. When the contact is activated an
indicator 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 described
in 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 the
remote 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). The
contact will be activated when the battery voltage is below a value, during a given time fixed by
parameters {1247/48}/{1250/51}/{1253/54}. The contact will be deactivated when the charge cycle
has reached floating {1516}, or when the "Aux. 1 deactivation voltage" {1255} is reached during a
predetermined time {1256}.
The voltage of the battery is automatically compensated according to the instantaneous
battery current the same way as it is done for compensation of LVD (see sect. 7.3.3– p.30) if
parameter {1191} is activated.
Contact no. 2 (AUX 2):
alarm contact by default. It is deactivated when the inverter is out of service
or is working at reduced performance, because of manual control or if there is an operational fault
such 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 freely
and individually programmable depending on the battery voltage, the output power, the inverter
status, the internal clock and the Battery state of charge (if BSP module is present) . These settings
can be done with the RCC-02/-03 (remote control unit).
The intelligent programming of the auxiliary contacts allows many applications to be considered
such 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 source
For more information on the programming of auxiliary contacts 1 and 2, refer to our
application 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 sources
AN007: Automatic start of a generator
7.6
R
EAL TIME CLOCK
The Xtender (see sect. 9.4 – p. 37) has a real time clock that allows programing the function of the
auxiliary 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 accidental
reversal of polarity of the battery. This does not eliminate the need to install a fuse close to
the battery. In case of reverse polarity, the fuse will not be destroyed and the unit will operate
normally after restoring the correct battery polarity.
