17
aTCA-81514PA
5 Fan Tray
5.1 Introduction
The Fan Tray is an intelligent FRU controlled by the ShMCs via IPMB.
The interchangeable Fan Tray is equipped with 8 high speed / high air flow fans
controlled as a group by the IPM Controller in the Fan Tray.
The Fan Tray is locked into the Shelf with captive screws. A Hot Swap push button
is used to provide hot
‐
swap functionality.
The Fan Tray provides:
•
A blue Hot Swap LED
•
A red Fan Tray Fault LED
•
A green Fan Tray OK LED
•
A Hot Swap push button
The Fan Tray is controlled via an on
‐
board IPM controller. The Shelf Manager
performs management of the Fan Tray through the two independent bussed IPMB
connections.
With optional on
‐
blade shelf management, the SEEPROM on the backplane are
connected to the internal I²C bus on the Fan Trays. The on
‐
blade Shelf Manager has
access to these components via the IPM controller of the Fan Trays.
The speed of each individual fan is monitored. If any of the fan speeds drops
below the desired fan speed, a System Event Log (SEL) entry is logged by the
Shelf Manager. The Shelf Manager then generates alerts and sets alarm
conditions as necessary.
The system is designed to run indefinitely with any single fan failure. When one fan
fails, all other fans are set to full speed.
Caution!
The fan tray is not redundant. Depending on the operation temperature and the
load state a fan tray swap must be carried out within a maximum of 30 seconds.
