User's Manual

Doc. No.
Rev.
Date
DRAFT
1.01
2012-01-27
Damm Cellular Systems A/S, Denmark
TetraFlex
®
7.5 Manual - BS41x
TetraFlex® 7.5 Manual 1-32
BS
Sensor
-
+
GND
Battery
48V
-
+
4-Wire
Blue 10sqmm
Black 10sqmm
Yellow/Green 15sqmm
Circuit
Breaker
50A
Sensor
The minus pole of the battery shall be provided with a circuit breaker as close to the battery
as possible in order to protect for any excess current flow at a short circuit. The nominal
current shall be higher than the peak charging/discharging current to avoid unintended
disconnects.
The Base Station should be connected to the battery with 10 mm
2
blue and black wires. In
addition, a 15mm
2
yellow/green wire shall connect protective ground on the rack to ground on
the battery, which should be connected to the plus-pole of the battery. The Base Station itself
(and optionally the battery) shall be provided with an effective grounding.
The TS411 temperature sensor shall be located at the battery and connected to the BS in the
connection box with the delivered 10m of cable. The cable is a standard 4-wire telephone
cable provided with two 4-pole RJ11 plugs (narrow types). The cable can be extended if
needed.
1.3.8.4 Battery charging
The PS411 contains configuration settings to control the charging of a –48V battery.
If charging is not selected the PS411 gives a fixed output voltage of –48V DC.
If charging is selected and the TS411 is properly attached, the PS411 changes to charging
mode. The output voltage is then increased to the correct charging voltage selected with the
configuration settings normally controlled from the BSC.
The output voltage is calculated from the nominal charging voltage at 25 Celsius, e.g. 2.25V
DC per cell and the required temperature compensation, e.g. –72mV per Celsius. With these
values the voltages would be:
Temperature
V-charge
-20 Celsius
57.2V
+25 Celsius
54.0V
+55 Celsius
51.8V