Description
AXP1620 Operations
AXP1620 Installation and Use (6806800E23E)
73
4.5.1
Description
The AXP1620 has PICMG 3.0 compliant, dual PEMs and is rated for nominal -48VDC to
-60VDC. The PEMs plug directly into the midplane and deliver power to the backplane. Each
input is rated for 80 amps. The two 80 amp feeds each power eight AdvancedTCA slots and the
upper and lower FTMs. Each PEM also generates a se12V 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 watt, +48VDC to +12VDC
converters which distribute dual power busses of +12VDC to separate parts of the system. The
+12VDC 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.
4.5.2
IPMC Circuitry
Each PEM is capable of monitoring voltage and circuit breaker status. The PEMs are loaded
with the AdvancedTCA IPMC firmware. Preprogrammed FRU and Sensor Data Record (SDR)
information reside on the PEM and is accessible from the SAM through the IPMB ports of the
PEM. In addition, the IPMC monitoring functions include digital inputs to detect circuit breaker
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 -48VDC
power to each PEM is removed. Make sure you disconnect the power at the external
source before removing the PEM from the shelf.
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.
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