Emerson AXP640-AC2-110VAC, Installation & Use Manual

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AXP640 Operations
AXP640 Installation and Use (6806800M24E )
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trips, voltage sensors to detect backplane voltages, current sensors to detect current to the
backplane, and on-board circuitry to detect failures on the PEM. The PEMs are managed by the
Sentry Shelf Management software. Refer to the
AXP640 Subsystem IPMI Programmer’s
Reference guide listed in Appendix A, Related Documentation for more information.
4.6 Fan Tray Modules
This section discusses the operation of the Fan Tray Modules (FTMs) of the AXP640.
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 SAM. The IPMI interface is used for reporting
faults, events, and status.The shelf manager software performs management of the FTM
through 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 the
AXP640 Subsystem IPMI
Programmer’s Reference guide listed in Appendix A, Related Documentation .
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 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 147 .
Each FTM is equipped with a single bi-colored status LED on the face plate. For removal and
installation procedures for the FTMs, refer to
Chapter 6, FRU Installation .
In the event of a FanOut-of-Service alarm, first check the fan filters to make sure the airflow is
not obstructed. For information on the maintenance of air filters, see
Air Filter Maintenance on
page 84 .
Table 4-1 PEM IPMB Addresses
Description IPMB Address
PEM A 0x66
PEM B 0x68