Power supply Subsystem
SPSH4 Server System External Product Specification
Revision
1.11
38
4.3 Cooling
Subsystem
Main system components are cooled by a set of fans mounted in a fan bay near the front of the
chassis and in front of the E-bay. The fan bay is shown below.
Figure 16: Fan Bay (Shown with all Fan Banks Installed)
The SPSH4 system comes in a redundant four-fan bank configuration consisting of two 120mm
fan banks for cooling the processor section of E-bay and two 80mm fan for cooling PCI section
of E-bay. The fans blind mate connect to the system fan board. Only a minimal configuration is
supported in the two fan bank configuration (one 120mm fan bank plus one 80mm fan):
•
One processor
•
Four memory DIMMs
Note:
Since SCSI bay hard drives and 5
¼”
peripheral bays are not cooled by dedicated SCSI
bay fans and from power supply fans, they are not subject to any limitations from the two-fan
bank configuration described above.
The four-fan bank configuration supports any system configuration. Air flows through the fan
bay and then through E-bay, and exhausts through the rear panel of the system. Additionally,
both SCSI bay fans and power supply fans pull air from the SCSI bays and from the 5
¼
“
peripheral bay. Each fan provides tachometer signal output to server management to indicate a
fan failure. Each fan also provides a presence signal to the fan board to indicate a missing fan.
4.3.1
Redundancy and Ambient Temperature Control
The fan board contains a pulse-width-modulation (PWM) circuit, which cycles the +12 V fan
voltage to provide quiet operation when system ambient temperature is low, and there are no
fan failures. Under normal room ambient conditions (less than 30
°
C) the fan power control
80mm
Fans
120mm Fan
Banks
Fan
Board
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