Ericsson RBS 2106 Hardware Reference Manual page 300

Climate Unit for RBS 2106
contain the climate unit internal interfaces to DC power, AC power, fans,
compressor, temperature sensors, and so on.
The front panel contains indicators, connectors for the EPC bus and a 25-pole
D-sub connector for test and control.
The CCU provides the following main functions:
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The test function is activated by the button on the front panel. After the test
has been completed, the indicators will present the status for two minutes. No
alarm is sent if there is a malfunction. It is possible to change the behaviour of
the climate unit by sending a set of parameters to the CCU through the EPC
bus.
4.5 DC/DC Converter
The DC/DC converter operates on +24 V DC from the RBS. The converter
feeds -48 V DC to the internal air circuit fan, external air circuit fan in the heat
exchanger and the CCU.
4.6 AC/DC Converter
The AC/DC converter converts AC mains to -48 V DC for the internal air circuit
fan, external air circuit fan in the heat exchanger and the CCU, when
+24 V DC supply is not present.
4.7 Transformer
The transformer supplies fans, heater, compressor and AC/DC converter with
230 V AC, independent of the mains input voltage.
The transformer has windings for mains input voltages of 200, 208, 230, 240
and 250 V AC. The mains voltage is selected using the voltage selector
switch.
6 (8)
Monitors internal and external temperatures
Monitors and controls the internal and external fans
Monitors and controls the compressor
Monitors and controls the condenser fan
Monitors and controls the heater
Handles alarm
Supervises mains voltage
Test
Combined Climate Unit
EN/LZT 720 0239 R1B