Battery Charger - Studer XTH 3000-12 User Manual

6.2.3.1 Fast voltage loss detection mode (fast transfer)
When the Xtender is connected to the public grid or to a generator supplying stable and clean AC
voltage, a fast voltage loss detection mode {1435} can be used. In this mode, perturbation or lack
of voltage of less than 1 millisecond can be detected, switching the unit in inverter mode
immediately. The sensitivity of this detection is adjustable with the parameter {1510}. This mode
guarantees a zero or maximum of 15 ms transfer time
This mode should not be used in presence of highly disturbed utility grid or with a low power
generator or a generator supplying a poor quality voltage.

6.2.4 Battery 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.
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.
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.
The charge cycle, programmed
by default, as shown in the
example described in the figure
opposite, runs automatically.
The line (28) indicates
development of the
voltage.
The lower line (29) indicates the
battery current (input
output).
The cycle starts with a continuous
current charge (a) adjusted by
default according
configuration {1138}.
ambient temperature is increased
or the ventilation blocked, the current may be reduced and become lower than the selected
current. Once the absorption voltage {1156) is reached, the cycle passes to voltage adjustment
mode (d), known as the absorption phase, the duration of which is set by the configuration {1157}.
The minimum interval between two absorption cycles is limited by the configuration {1161).
At the expiry of the absorption time, or if the absorption current is lower than the configuration
{1159}, the voltage is set to a lower value {1140}. This phase (e) is known as the maintenance or
"floating" phase. Due to the limiting function for the input current (see the following p. 22), it is
perfectly normal for the charge current to be lower than the selected current if the limit of the AC
input current {1107} is reached (b). In this event the AC IN indicator (45) flashes. If the "smart boost"
function is activated {1126} and the power required by the consumer exceeds the power of the
source, the battery will be discharged (c) despite the presence of the grid or the generator. In this
case the LED "charge" (4) goes out. The consumers must ensure that they have average
consumption that is less than the power of the source (generator or public grid) in order to avoid a
complete discharge of the battery. These situations are set out in the figure below.
User manual
the
battery
28
and
29
to the
Fig. 3b: Simplified charge cycle, without input current limitation
If the
V.3.1.0
STUDER Innotec
ACin=OK
a e
d
Xtender
{1138}
{1156}
{1140}
{1159}
21