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AXP1440 Shelf Description
AXP1440 Installation and Use (6806800H23T) 61
2.9 Power Entry Modules (PEMs)
The PEM is a Field Replaceable Unit (FRU) and can be replaced while the system is on, but the
power for the PEM being replaced (PEM A or PEM B) must be shut down at the external source.
Replacement can take place in under 30 minutes by a trained service person.
For important information on removing power before replacing a PEM, refer to Recommended
Power-Off Procedures on page 80 and Power Entry Module (PEM) on page 81 .
The PEMs are accessible from the rear of the shelf and connect to the power entry module
connectors on the backplane. A removable plastic housing covers the power feeds and returns
to prevent accidental shorting. The PEM also features an injector/ejector handle that provides
the hot swap mechanism for signaling the state of the PEM prior to removal.
Each PEM powers two separate power domains A and B and each domain supports two 80A
power rails to supply power to the AdvancedTCA slots.
Figure 2-6. Upper Front FTM, Front View