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AXP1620 Operations
4.6
4.6.1
74
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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 AXP1620 Subsystem IPMI Programmer's
Reference guide listed in
Appendix A, Related Documentation
Table 4-1 PEM IPMB Addresses
Description
PEM A
PEM B
Figure 2-3 on page 49
provides a conceptual view of the connections between the PEMs,
backplane, FTMs, and SAMs.
Fan Tray Modules
This section discusses the operation of the Fan Tray Modules (FTMs) of the AXP1620.
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 AXP1620 Subsystem IPMI
Programmer's Reference guide listed in
The upper FTM receives its signal and power connections from the backplane through 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 through the IPM shelf management software. The fan speed levels
change automatically based on temperature sensors. For more information, refer to
and Control on page
125.
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 6, FRU
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. For information on the maintenance of air
filters, see
Air Filter Maintenance on page
IPMB Address
0x66
0x68
Appendix A, Related
Installation.
75.
AXP1620 Installation and Use (6806800E23E)
Fan Tray Modules
for more information.
Documentation.
Fan Speed
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