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AXP1440 Operations
AXP1440 Installation and Use (6806800H23U) 81
4.5 Power Entry Module (PEM)
This section discusses the operations of the Power Entry Module for the AXP1440
configurations.
4.5.1 Description
The AXP1440 has PICMG 3.0 compliant, dual PEMs and is rated for nominal -48 VDC to
-60 VDC. The PEMs plug directly into the mid plane and deliver power to the backplane. Each
input is rated for 80 A. The two 80 A feeds each power eight AdvancedTCA slots and the upper
and lower FTMs. Each PEM also generates a se12 V for redundant powering of the
SAMs. This voltage is distributed to each of these modules across the backplane.
Power conversion for the SAMs and PEMs consists of two 66 W, +48 VDC to +12 VDC converters
which distribute dual power busses of +12 VDC to separate parts of the system. The +12 VDC
outputs are provided on the backplane connector to the rest of the shelf. Power is redundant
through the secondary PEM
Power is introduced to the PEM using a DC power cable attached to the terminal blocks on the
front of the module (power input cable and return cable). The terminal block consists of a dual
stud connection which prevents the power cables from rotating and provides secure contacts
for the cable lug. There is a plastic cover that protects the cable connections.
Removing power to these components cannot be accomplished by turning the PEM's
circuit breakers to the OFF position. The PEMs remain powered until the -48 VDC power
to each PEM is removed. Make sure you disconnect the power at the external source
before removing the PEM from the shelf.
NOTICE
The DC power inputs must only be attached to approved Telephone Network Voltage
(TNV) or Safety Extra Low Voltage (SELV) branch circuits. Branch circuits must comply
with all requirements called for in these safety standards: IEC 60950, EN 60950,
CAN/CSA-C22.2 No. 60950. Attaching inputs to non-TNV/SELV approved power sources
will cause the system to fail compliance with safety regulations.