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

Page: 83 / 190

AXP640 Operations
AXP640 Installation and Use (6806800M24E)
83
4.6.2 Cooling Budget
The shelf cooling is designed to operate with the following temperature rises across the shelf.
This allows cards with these dissipations to operate with commercial grade components, 70
°
C
ambient temperature typical.
The following guidelines can assist in determining the cause of the cooling failure. Also refer to
Environmental Requirements on page 56 for important information regarding ambient
temperature requirements during servicing.
If a cooling failure occurs, the failure may be caused by a failed fan or possibly a clogged filter.
Check the filter first before replacing the FTM (see
Air Filter Maintenance on page 84 ).
For further information of nonrecoverable temperature events, refer to the FRU Information
chapter in the
AXP640 Subsystem IPMI Programmer’s Reference .
4.6.3 IPMC Circuitry
Preprogrammed FRU and SDR information reside on the FTMs and is accessible from the SAM
through the IPMB. FRU information can be found in the
AXP640 Subsystem IPMI Programmer’s
Reference , listed in Appendix A, Related Documentation .
Table 4-2 Cooling Budget
Ambient Temperature Temperature Rise
25
°
C Delta T = 20
°
C
40
°
C Delta T = 15
°
C
55
°
C Delta T = 10
°
C