Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 23
Overheating of the Xtender: Insufficient ventilation, increased ambient temperature or obstructed
ventilation may lead to overheating of certain internal components of the unit. In this case, the
device will automatically limit its power output as long as this abnormal situation persists.
The Xtender is protected by the internal fuse from incorrect polarity (24 V and 28 V versions). The
Xtender XTH-3000-12 does not have an internal fuse and can be protected by an external 400 A
fuse.
6.2.9 AUXILIARY CONTACTS
The Xtender has two dry reversing contacts that are potential-free. The status of the contacts in
idle mode (deactivated) is indicated by the annotations, N.C. = normally closed and N.O. =
normally open.
Maximum contact loads: 230 Vac / 24 Vdc: 16 A or: > 36 Vdc / 3 A
These dry contacts are programmed by default for the following functions:
Contact no. 1 (AUX1) : alarm contact by default. It is activated when the inverter is out of service
or is working at reduced performance, either because of manual control or if there is an
operational fault such as overload, undervoltage of the battery, overtemperature, etc.
Contact no. 2 (AUX 2): The contact has a load shedding function by default and is activated when
the battery voltage corresponds to the configurations {1356/1357}.
These auxiliary contacts can be freely programmed by the RCC-02/03 remote control for various
applications.
The functions of the two auxiliary contracts can be modified and programmed variously with the
help of the RCC-02/03 control.
If the operator or installer requires different behaviour for the auxiliary contacts, they are both
freely and individually programmable depending on the battery voltage and the inverter status
and the internal clock.
The intelligent programming of the auxiliary contacts allows many applications to be considered
such as:
Automatic startup of the generator (two or three wires)
Automatic load shedding of the inverter (2 sequences)
Global or individual alarm
Automatic disconnection (load shedding) of the source
6.2.10 THE REAL TIME CLOCK
The Xtender has a real time clock that allows the functioning of the auxiliary contacts to be
managed, in particular. This clock must be adjusted via the use of the RCC-02/03 remote control.
If you wish to retain the adjustment of the clock even if the installation is out of operation (button
1)) or in the absence of a battery, a lithium-ion type 3.3 V disc battery (CR-2032) must be
inserted into the battery carrier (5) which is on the left of the junction box.
6.2.11 REMOTE CONT ROL VIA DRY CONTACT
The functioning of the Xtender may be interrupted by opening the connection, normally between
the two terminal points “REMOTE ON/OFF”, fig. 8a-(7). Operation will recommence when this
connection is re-established. The device is delivered with a bridge between the 2 points of this
terminal.
It is also possible to control this function according to the different variants indicated in fig. 8b. If a
variant is used, the jumpers (b) must be positioned at 1 a-b and 2 a-b.
Operating voltage: Max. 60 V eff. (I max. 30 mA)
In multi-unit configurations (see below) the interruption of operation of just one of the system’s
units by the cabled control (7) involves the immediate interruption of operation of the other units
of the system. This input can be used, for example, as an emergency stop.
6.3 Multi-unit configurations Several Xtenders can be used in the same system, either to create a three-phase system or to
increase the power output of a single or two phases. The implementation of this configuration
requires particular precautions and it must be installed and commissioned by qualified personnel
only.
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 system, 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 2 metres.