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TD140 Hardware Maintenance Guide 7.13.2
18
2
TD140 Chassis Subsystem
Rev. 001-140228
Air Filter Presence Sensor
The presence of the air filter is detected by a Hall effect sensor located on the Chassis Data
Module (CDM). The Hall effect sensor is activated by a magnet mounted at the rear side of the
air filter metal frame.
Power Entry Modules (PEMs)
Two pluggable, redundant Power Entry Modules (PEMs) are located at the upper rear side of
the chassis. The PEMs provide dual redundant power sources for ATCA modules through the
backplane. A failed PEM can be replaced without disruption of platform operation.
Each PEM provides power terminals for one 60 A power feed, which consists of a -48 VDC
cable and its corresponding return cable.
Hot-swap functionality of the PEMs is provided by a hot-swap button and a blue (Hot Swap)
LED. Additionally, a red (Alarm) LED and a green (OK) LED indicate the power status.
Front Panel
shows the interfaces and components on the PEM front panel.
Figure 2.7 - PEM Front Panel
The hot-swap button is used to remove a PEM without powering off the platform.
Hot swap
ďƵƩŽŶ
Hot swap
LED (blue)
PEM Alarm
LED (red)
PEM OK
>;ŐƌĞĞŶͿ
Fused switch
ďƌĂŶĐŚϭ
Fused switch
ďƌĂŶĐŚϮ
Power
ƚĞƌŵŝŶĂů
Screw
Screw
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