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System Cooling
4.2
Fan Control
The fans in the Intel® Server Chassis SC5300 are designed for server boards which support fan
control. The front panel of the chassis has an active temperature sensor (i.e., Dallas* 1621)
connected to the front panel's bus. Based on the inlet temperature measured, the server
board's firmware will adjust the fan voltage. This will maintain proper system cooling of all
components and peripherals, while minimizing the acoustic noise level. To hot swap a fan, the
user should remove the failed fan, wait at least 30 seconds, and then insert the replacement
fan. The firmware will then re-arm the fan sensor. The correct Field Replaceable Unit
(FRU)/Sensor Data Record (SDR) must be installed to ensure proper functionality of the fan
control.
4.3
FAN Header Connector Descriptions
Fan #1 and #2 headers on the supported server boards are different from Fan #3 and #4
headers due to the use of new pulse width modulated(PWM) fans used for cooling the
processors in the chassis.
Fan #1 and #2 are the standard 3-pin fan headers used with 3-wire fans (pwr, tach, gnd). These
fans are commonly called "TAC Fans".
Fan #3 and #4 headers are a combination of 3-pin and 2-pin fan headers. The 3-pin connector
can be used for a standard 3-wire fan (pwr, tach, gnd). New for the Server Chassis SC5300
series is a 6-pin fan connector, which can span the two connectors required for the added hot
swap functions. The empty pin is a key, so that these fan header connectors cannot mistakenly
be plugged into headers #5 and #6.
Fan #5 and #6 are the new 6-pin fan headers for the new 4-wire fans (pwr, tach, gnd, pwm) plus
the hot swap signals. All 6 pins are used on this connector.
The new 4-wire fans used for cooling the processors allows the RPM to vary from 20% to 100%
of full speed. This expanded speed range provides better acoustics and thermal control. The
older 3-wire fans are limited to a 60% to 100% RPM range. Fans #1 through #4 on the
supported server boards remain compatible with more common (older) 3-pin fan headers.
52
Intel® Server Chassis SC5300 5U Kit TPS
Revision 1.31
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