Manual Part 6

FCU-01
1 Product Overview
The FCU-01 controls an d supervises the fans i n an RBS cabinet.
1.1 Main Functions
The FCU-01 has the followi ng main functions.
• Controls and supervises fans
• Generates alarms
• Man-Machine Interface (MMI) for the fa ns
2 Dimensions
The phy sical characteristics of the FCU-01 are shown in the table below.
Table 1 FCU-01 Size and Weig ht
Height Width Depth Weight
195 mm 98 m m 45 m m 0.5 kg
3 Function Description
The FCU-01 receives info rmation on the Env ironmental and Power Control
(EPC) bus about the required DC voltage level for each fan. The FCU-01 feeds
each fan with t he require d DC voltage le vel. If no DC level is received, the
DC level for the fans is equal to the FCU-01 input voltage, minu s a maximum
voltage drop of 0.7 V.
If th e normally closed circuit in the fan is opened, the indicator ‘‘Fan fault’’ for
that fan is illumin ated, and an alarm is sent through the EPC bus.
The FCU-01 compares the DC level for each fan with the required DC level.
If these do not match, the ‘‘FCU fault’’ indicator is illuminated, a nd an alarm
is sent through the EPC bus.
If the comm unication on the bus no longer is defined, the ‘‘EPC bus fault’’
indicator is illuminated, and an alarm is sent thro ugh the EPC bus to the
Distribution Switch Unit (DXU).
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EN/LZT 720 0246 Uen R2A