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6
Cooling system
Cooling is provided by the two Advanced Cooling Modules (ACMs)
located at the rear of the enclosure. Each of the ACM units contain
two variable speed fans. The enclosure requires four fans for normal
operation, but will operate correctly when one fan fails to function
(redundancy is lost if one fan is failed in either ACM), however, it is
recommended that the failed fan be replaced as soon as possible. The
ACM units can be hot swapped. The I/O Option Module (ESM and TSM
described later) monitors and controls the speed of each fan. The
speed is set depending on the ambient temperature and failed status.
The fans are set to full speed, if one fan fails to function.
Fans 3 & 4
The following table shows how the fan speed relates to temperature
change.
ACM Speed
Speed 1
Speed 2
Speed 3
Full Speed
Note: All fans are set to the same speed.
ACMs
Fans 1 & 2
1
2
Mute
o
Ambient Temp (
0 to 26
26 to 28
28 to 30
30 +
1 Introduction
1
2
C
)
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