SMART Embedded Computing 6806800V18A, Installation And Use Manual

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92 AXP1440-C07 Installation and Use (6806800V18A)
AXP1440-C07 Operations
AXP1440-C07 Operations
4.6 Fan Tray Modules
This section discusses the operation of the AXP1440-C07 Fan Tray Modules (FTMs).
4.6.1 Description
The FTMs are loaded with AdvancedTCA IPMC firmware. The fans are controlled as a
group through the IPMI-based interfaces (IPMB) to the SAM1620-D. The IPMI interface is
used for reporting faults, events, and status.The shelf manager software performs
management of the fan tray modules through the IPMB bus.The IPMC circuit provides
temperature sensors for monitoring the temperatures of the board components and for
monitoring the inlet and outlet air temperature of the shelf. For further information, refer to
the
Centellis 4440/4620 Control via IPMI Programmer’s Reference
, listed in
Appendix A
.
The upper fan tray module, UFT1440-D, receives its signal and power connections from
the backplane through a distribution board. A fan interconnect board connects the
backplane to the distribution board. The FTMs are powered from -48VDC from the
backplane. The lower fan tray module, LFT1440, receives its signal and power connections
from the AdvancedTCA backplane. Only the lower has an air filter frame and filter in the
module.
The FTMs have variable speed fan control, which is dependent on the temperature
readings in the shelf. Airflow rates can vary depending on the fan speed and payload. Fan
speed levels are controlled from the SAM1620-D through the IPM shelf management
software. The fan speed levels change automatically based on temperature sensors. For
more information, refer to
Fan Speed and Control on page 146
.
The fan tray modules have an ejector handle that interfaces with a mechanical switch to
signal the software for hot swap. The handle and captive screws lock the FTM securely into
the shelf. Each FTM is equipped with three status LEDs on the face plate. For removal and
installation procedures for the FTMs, refer to
Chapter 6 FRU Installation
.
In the event of a Fan/Filter Out-of-Service alarm, first check the fan filters (only on the lower
LFT1440) to make sure the airflow is not obstructed. For information on the maintenance
of air filters, see
Air Filter Maintenance on page 93
.