Intel SR1500 SR1550 Chassis TPS - Page 34

Cooling Subsystem, Revision - 1.3, Intel order number D31982-006, Table 17., Fan Connector Pin

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Intel® Server System SR1550AL Cooling Subsystem The individual system fans are not hot-swappable and require the system to be turned off before being replaced. The chassis is classified as a "Service Access Only" device and caution should be exercised when replacing a system fan, as they do not have finger guards. However, provisions are built into the fan bracket to prevent service technicians from accidental contact with fan rotors. Each fan within the module is capable of supporting multiple speeds. If the internal ambient temperature of the system exceeds the value programmed into the thermal sensor data record (SDR), the BMC firmware will increase the speed for all the fans within the fan module. Each fan connector within the module supplies two tachometer signals (one for each fan rotor) allowing for baseboard management to monitor the status of each fan rotor. If one of the fans should fail, the remaining fans will increase their rotation and attempt to maintain the thermal requirements of the system. Each system fan has an associated fan fault LED which is located next to its respective fan cable connector on the mid-plane board. The fan fault LED is controlled by the BMC. If either fan rotor within a system fan fails, it will illuminate the fan fault LED and log the failure into the System Event Log. Table 17. Fan Connector Pin Assingment Pin Signal Name Description 1 Tachometer B Fan RPM sensor output 2 PWM Fan speed control signal 3 12V Power for fan 4 12V Power for fan 5 Tachometer A Fan RPM sensor output 6 Return Return path to ground 7 Return Return path to ground 8 Fan Presence Detection if fan is installed in system 9 LED Cathode Loopback signal to pin 10 10 LED Anode Loopback signal to pin 9 The system fan cables plug onto connectors on the mid-plane board according the following scheme. Both passive and active mid-planes have the same fan numbering and fan connector locations. Figure 17. Fan Header Assignments on Mid-Plane Revision - 1.3 21 Intel order number D31982-006

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Intel® Server System SR1550AL
Cooling Subsystem
Revision – 1.3
Intel order number D31982-006
21
The individual system fans are not hot-swappable and require the system to be turned off before
being replaced. The chassis is classified as a “Service Access Only” device and caution should
be exercised when replacing a system fan, as they do not have finger guards. However,
provisions are built into the fan bracket to prevent service technicians from accidental contact
with fan rotors. Each fan within the module is capable of supporting multiple speeds. If the
internal ambient temperature of the system exceeds the value programmed into the thermal
sensor data record (SDR), the BMC firmware will increase the speed for all the fans within the
fan module.
Each fan connector within the module supplies two tachometer signals (one for each fan rotor)
allowing for baseboard management to monitor the status of each fan rotor. If one of the fans
should fail, the remaining fans will increase their rotation and attempt to maintain the thermal
requirements of the system.
Each system fan has an associated fan fault LED which is located next to its respective fan
cable connector on the mid-plane board.
The fan fault LED is controlled by the BMC. If either
fan rotor within a system fan fails, it will illuminate the fan fault LED and log the failure into the
System Event Log.
Table 17.
Fan Connector Pin Assingment
Pin
Signal Name
Description
1
Tachometer B
Fan RPM sensor output
2
PWM
Fan speed control signal
3
12V
Power for fan
4
12V
Power for fan
5
Tachometer A
Fan RPM sensor output
6
Return
Return path to ground
7
Return
Return path to ground
8
Fan Presence
Detection if fan is installed in system
9
LED Cathode
Loopback signal to pin 10
10
LED Anode
Loopback signal to pin 9
The system fan cables plug onto connectors on the mid-plane board according the following
scheme. Both passive and active mid-planes have the same fan numbering and fan connector
locations.
Figure 17. Fan Header Assignments on Mid-Plane