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T Series Data Sheet
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Control Features of the Battery Chargers
500 Watt AC-DC Converters
06068
2.23 V 2.24 V
According to the recommendations of battery manufacturers,
the float-charge voltage of lead-acid batteries should be
0
2.25 V
2.26 V
temperature-compensated. Depending on the battery type and
size, charging with different temperature coefficients may be
2.35 V
C
4
2.27 V
required. An excessive float-charge voltage may damage the
2.28 V
battery through overcharging.
8
2.29 V
Most lead-acid battery manufacturers recommend cell
voltages between 2.23 V and 2.32 V, with the nominal cell
voltage defined at 20 °C and temperature coefficients per cell
between –3 and –4 mV/K.
2.32 V
Fig. 15
Cell voltage selector switch
2.31 V
2.30 V
The value of the negative temperature coefficient is specified
by the type of T temperature sensor.
With the cell voltage selector switch Z, the required cell voltage
can be adjusted at the rear of the converter, making the system
flexible to different float-charge voltages. If the selector switch
Z is not applicable, a cell voltage adjustment can also be
provided by the temperature sensor; see Temperature Sensor
T ).
Although it is not recommended, the output voltage can be set
to a fixed value without temperature compensation by an
external voltage source or a resistive voltage divider at the
remote control input, for instance if the battery temperature
shall be controlled by other systems; see External Output
Voltage Control .
Cell Voltage Selector Switch Z
The battery chargers are equipped with the cell voltage
selector switch at the rear side, which provides an easy way of
external adjustment to the required float-charge voltage. Each
switch position allows a step in the output voltage of 10 mV per
cell, whereby the switch position "0" represents a cell voltage
of 2.23 V at 20 °C; position "C" gives 2.35 V per cell.
The cell voltage selector switch fits together with the 2.23 V
temperature sensor. The float-charge voltage is set by the
switch, and the temperature coefficient is specified by the
sensor type.
Caution: Setting the switch to the correct battery cell voltage is
vital for the proper operation of a battery system.
Note: Switching to a different cell voltage while the battery charger
is operating may cause a short distortion of the output voltage.
Potentiometer for Fine Tuning
The battery chargers are equipped with a one-turn
potentiometer for fine tuning of the output voltage to within
±3.7 0 / 00 of V o . The potentiometer is protected by a plastic
cover. To adjust the output voltage for improved current
sharing or compensation for voltage drops over the load lines,
each battery charger in a system should be unplugged and
adjusted individually to the same output voltage at equal load;
otherwise current sharing may adversely be affected.
External Output Voltage Control
The i/Vcr control input (pin 28) provides two functions:
– External adjustment of the output voltage
– Inhibiting of the converter.
A voltage <0.4 V inhibits the output, a voltage >2.5 V enables it.
With the i/Vcr input in the range of 5.5 V to 11.5 V, the output
voltage V o set can be adjusted within a range of +3.6% to
–7.9%. This feature is optimized to control the float-charge of a
lead acid batteriy.
Outside of the control range, the sensor monitoring circuit
generates a system error signal (see also System Good).
In the case of a excessively high control voltage, the output
voltage is reduced.
The remote control input is protected against DC overvoltage
up to 60 V.
Note: An open inhibit/Vcr remote control input leads to a sensor
error signal which is indicated by the Error LED at the front and
high impedance of the "System good" signal. The output voltage is
reduced to V cr fail condition.
Table 8: Characteristics of the remote control
Characteristics
Conditions
LT/UT1240
LT1840
LT/UT1740
Unit
typ
typ
V o
Output voltage at:
Voltage selector switch
25.25
37.85
50.5
V
V cr fail 2.5 – 5.5 V
Z set at 2.23 V/cell or
V cr control 5.5 – 11.5 V
V cr clamp 11.5 – 14 V
V cr fail 14 – 60 V
without selector switch Z
selector switch Z
V i nom , 0.5 ? I o nom
22.5 + V cr ? 0.5
28.25
25.25
22.5 + V cr ? 0.5
42.37
37.85
45 + V cr
56.5
50.5
R cr
f cr
Input impedance
Frequency limit
1
1
1
1
1
1
M ?
Hz
BCD20023 Rev AB, 02-Nov-2010
Page 11 of 31
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