Ericsson RBS 2106 Hardware Reference Manual page 347

1 Product Overview
The Fan Control Unit (FCU) controls and supervises the fans in an RBS
cabinet.
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The FCU-01 has the following main functions:
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2 Dimensions
The FCU-01 has the following physical characteristics:
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195 mm
3 Function Description
The FCU receives information on the EPC bus about the required DC voltage
level for each fan. It feeds each fan with the required DC voltage level. If no
DC level is received, the DC level for the fans will be equal to the FCU input
voltage, minus a maximum voltage drop of 0.7 V.
If the normally closed circuit in the fan is opened, the indicator "Fan fault" for
that fan is illuminated, and an alarm is sent through the EPC bus.
The FCU compares the DC level for each fan with the required DC level. If
these do not match, the indicator "FCU fault" is illuminated, and an alarm is
sent through the EPC-bus.
If the communication on the bus no longer is defined, the indicator "EPC bus
fault" is illuminated, and an alarm is sent through the EPC bus to the DXU.
Controls and supervises fans
Generates alarm
MMI for the fans
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98 mm
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45 mm 0.5 kg
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EN/LZT 720 0246 R1A