Emergency Power Off Procedures; Power Entry Module; Description - SMART Embedded Computing AXP1440-C07 Installation And Use Manual

AXP1440-C07 Operations
4.4

Emergency Power Off Procedures

Procedure - Power Off in an Emergency
Read this caution and follow the next steps if it is necessary to remove power during an
emergency situation.
Following this procedure will result in a loss of data and may cause damage to shelf
components in a running system. Use this method only when normal shutdown
procedures cannot be followed.
1. Turn each circuit breaker on the front of PEM A and PEM B to the OFF position.
2. Disable the DC power at the external sources (branch circuit or power distribution unit)
for PEM A and PEM B).
4.5

Power Entry Module

This section discusses the operations of the PEM for the AXP1440-C07 configurations.
4.5.1

Description

The AXP1440-C07 has dual PEMs and is rated for nominal -48VDC/-60VDC. The PEMs
plug directly into the midplane and deliver power to the backplane. Each input is rated for
80A. The two 80A feeds each power eight AdvancedTCA slots and the upper and lower
FTMs. Each PEM also generates a separate +12V for redundant powering of the
SAM1620-Ds. This voltage is distributed to each of these modules across the backplane.
Power conversion for the SAM1620-Ds 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.
Removing power to these components cannot be accomplished by turning the PEM
circuit breaker 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.
90 AXP1440-C07 Installation and Use (6806800V18A)
AXP1440-C07 Operations