User manual

26
© 2006, Elektro-Automatik GmbH & Co. KG
Irrtümer und Änderungen vorbehalten
EN
© 2009, Elektro-Automatik GmbH & Co. KG
Functional description
The included sensor LM335 or the similiar type
KTY81/20 can be used. The type has to be selected
in the device setup.
The temperatur range T stop, min to T stop, max
applies for temperature supervision. At battery tempe-
ratures beyond this range, the charging halts and the
device reports an error. The internal phase time counter
for the current phase, like for t
CHARGE
, is also halted, but
the total charging time in the display continues. As soon
as the temperature is within the allowed range again,
the charging continues.
The second temperature range denes the when tem-
perature compensation is effective. Beyond this range,
which is always a part of the total temperature range,
the charging voltage is not furtherly compensated.
The compensation of the charging voltage is done with
the dened temperature coefcient value in the battery
prole (mV/Kelvin and per cell). This value is seperately
adjustable for normal and trickle charge.
Remote sense
In order to compensate voltage drops along the load
leads, the device features remote sense inputs on
the front. Here the sensed voltage from the battery
is connected with correct polarity. Remote sense can
compensate up to 2V.
When not using the sense inputs, they just remain open.
It is not required to bridge them to the output.
Power Supply mode
The device can be used as power supply, if set to Pow-
er Supply in the device setup. It will then either work
in constant voltage operation (CV) or constant current
operation (CC). The output voltage and current become
adjustable from 0...100% nominal values.
Additionally, an overvoltage protection threshold OVP
PS mode U= (0...110% U
Nom
) can be dened in the
device setup.
This mode is suitable for parallel standby operation.
Overvoltage protection (OVP)
All models feature an overvoltage protection circuit with
a threshold that is dened as 110% U
Nom
. For example,
if the charger model is a BCI 812 with 16V U
Nom
, then
the max. OVP threshold is 17.6V.
The threshold is differently adjusted for Power Supply
and Battery Charger mode.
In Power Supply mode, it is the total range of 0...110%
U
Nom
.
In Battery Charger mode, it is an offset of 1V...10V
that is internally added to the actual output voltage
and set as OVP threshold. But the max. OVP still lies
at 110% U
Nom
.
Example: if the output voltage of a 16V device is 4.2V
and the OVP offset is set to 10V, the OVP becomes
active above 14.2V. Otherwise, if the output voltage
was 10V, then the OVP would become active at above
17.6V.
In case of an overvoltage condition, whether caused
by an internal defect or by external reasons, the power
output is switched off and the alarm is displayed as text
or by an alarm symbol and also by pin 9 (ERROR) of
the analogue interface. After the OV condition is gone,
the output can be switched on resp. the charging can
be started again.
Overtemperature (OT)
All models also feature an internal temperature super-
vision. In case of overheating, the power output will
be temporarily switched off until the device has cooled
down, and then automatically switch on again. Charging
is only paused, but not stopped. The condition is indi-
cated in the display by a text or an alarm symbol, and
by pin 9 (ERROR) of the analogue interface.
Other errors
Any error is indicated in the display by a symbol or
by an error message and also by pin 9 (ERROR) of
the analogue interface. Following error sources can
be detected (see also „Errors and Alarms“ below for
details):
• Connection of a totally discharged or defective battery
• Temperature sensor failure (broken wire etc.)
• Battery with wrong voltage
• Cell short-circuit
• Various device and communication errors