Artesyn Centellis 4410 (AXP-1410) Installation and Use (July 2014) - Manual (Page 126)

Configuring and Operating the System
AXP 1410 Installation and Use (6806800H70L) 126
5.6 Fan Tray Modules
This section discusses the operation of the Fan Tray Modules (FTMs) of the AXP 1410.
5.6.1 Description
The FTMs are loaded with AdvancedTCA IPMC firmware. The fans are controlled as a group via
the IPMI-based interfaces (IPMB) to the SAM. The IPMI interface is used for reporting faults,
events, and status.The shelf manager software performs management of the FTM via the IPMB
bus.The IPMC circuit provides temperature sensors for monitoring the temperatures of the
FTM board components and for monitoring the inlet and outlet air temperature of the shelf.
For further information, refer to
Chapter 7, FRU Information and Sensor Data Records, on page
145
The upper FTM receives its signal and power connections from the backplane via a FTM
distribution board. A fan interconnect board connects the backplane to the FTM distribution
board. The FTMs are powered from -48VDC from the backplane. The lower FTM receives its
signal and power connections from the AdvancedTCA backplane. Only the lower FTM 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 SAM via the IPM shelf management software. The fan speed levels change
automatically based on temperature sensors. If any FRU exceeds the upper non-recoverable
threshold, it is powered down.
The FTM has 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 4, FRU Installation .
In the event of a Fan/Filter Out-of-Service alarm, first check the fan filters (only on the lower
FTMs) to make sure the airflow is not obstructed.