Ericsson RBS 2106 Hardware Reference Manual page 356

Climate Unit for RBS 2106
Backplane and Front Panel
The backplane connectors contain the climate unit internal interfaces to DC
power, AC power, fans, temperature sensors, and so on.
The front panel contains indicators, connectors for the EPC bus and for test
and control.
4.4 AC/DC Converter
The AC/DC converter is used when +24 V DC supply is shut off. It changes
the mains voltage to +24 V DC, to supply the internal air circuit fan, the
external circuit fan in the heat exchanger, and the CCU.
4.5 Autotransformer
The transformer converts different AC mains input voltages to 230 V AC for
feeding the heater, the AC/DC converter and fans.
The transformer has windings for mains input voltages of 200, 208, 230, 240
and 250 V AC. The mains voltage is selected with the Voltage Selector
Switch.
Connection to 120 V AC is made between phases with 208 V AC selected.
Other voltages are connected between phase and neutral.
5 Interfaces
5.1 Signal and Power
The Heat Exchanger Climate Unit has the following external interfaces:
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•
•
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6 (8)
DC power
AC mains power
EPC bus (on the CCU)
Test and general signals (25-pole D-sub on the CCU)
Heat Exchanger Climate Unit
EN/LZT 720 0311 R1A