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Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 19
technical data p. 37). The detection threshold for the absence of loads can be adjusted according
to the configuration range {1187} by means of the RCC-02/03 remote control. When the
configuration is set to 0 the inverter will still operate even in the absence of any consumer.
6.2.3
T
RANSFER RELAY
The Xtender can be connected to an alternative power source such as a generator or public
network. When the voltage at the entry satisfies the voltage {1199+470} and frequency {1505-
1506} parameters, the transfer relay will be activated, except where the input current limit{1107}
is lower than the instantaneous current supplied by the Xtender inverter. If the limit has not been
exceeded then the voltage present at the input of the Xtender is therefore available at the output
for the consumers connected. At the same time the battery charger goes into operation. The
sharing of energy between consumers and the battery charger is adjusted automatically (see
chap. 6.2.6 – p. 21). The transfer relay will be deactivated when the input voltage no longer
satisfies the configuration {1199} or {1432} min. and max. voltage and frequency at the input or
when the current limit {1107} is exceeded, if the exceeding of this limit is prohibited {1436} It then
passes immediately into inverter mode. In this case the loads are supplied exclusively by the
battery via the inverter (see chap. 6.2.7 – p. 21).
A delay before the opening of the transfer relay can be adjusted {1198}.
This switching always takes place automatically. The switching always takes place without delay
by default (UPS mode) and the equipment will pass into inverter mode once the voltage and
frequency criteria at the input are no longer being fulfilled. The presence of increased dynamic
loads (such as pneumatic angle grinders, etc.) may lead to an undesirable opening of the transfer
relay due to the weakness of the source. In this case a delay in the opening of the transfer relay
{1198} may be introduced via the RCC-02/03 remote control.
The transfer normally takes place without any interruption when the generator stops. It would
typically be 20 minutes in the event of the immediate loss of input voltage at “AC IN”.
The maximum current of the transfer relay is 30 A (50 A for XTH 8000-48). This means that the
permanent power of the consumers must be a maximum of 6,900 W to 230 V (11,500 W for the
XTH 8000-48). It cannot be higher if the “Smart Boost” function is activated {1126} (see chap.
6.2.7 p. 21). If the battery charger is in operation, part of this power will be used for the battery
charge.
When the transfer relay of the Xtender is active, the voltage at the output of the Xtender
is equivalent to that which is present at the input and cannot be influenced or improved
by the Xtender. The consumers are supplied by the source present at the “AC IN” input
via the transfer relay.
6.2.4
B
ATTERY CHARGER
The battery charger is designed in such a way as to guarantee charging of the battery that is as
complete as possible. The charging process is at four levels by default and guarantees optimum
charging of the batteries. The charging current is given by the configuration {1138} and can be
adjusted continuously from 0 to the nominal value with the help of the RCC-02/03.
6.2.5
B
ATTERY CHARGER
The battery charger for the Xtender is completely automatic and is designed in such a way as to
guarantee an optimum charge for the majority of the lead-acid or gel batteries. Once the transfer
relay is activated, the battery charger goes into operation and the charge indicator (44) lights up.
If the battery voltage is lower than the critical disconnection threshold {1488} operation of
the charger will be automatically prevented. Only the transfer relay is authorised to
operate in this case. The battery must then be recharged by an external source up to a
voltage higher than the critical disconnection threshold in order to allow the Xtender
charger to operate.