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AC Interface
Cooling System
(Freestanding
Unit Description)
Cooling The
Power Supply
System Monitor
Understanding The 1264C 4-4
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AC Power supplied to the 1264C at J400 is fused at F400 and
routed to switch S100 (main On/Off). The secondary side of S100
is routed to the power supply PS1 and to the cooling fan F1. The
in-line connector interface J300/P300 provides the means of
routing the AC power from the rear panel to the power supply
assembly (including S100) and back to the cooling fan.
The cooling fan F1 is located rear of the mainframe.
Module cooling air enters at the rear of a 1264C mainframe and is
forced into a pressurized plenum below P2 the VXI modules. The
high pressure in the plenum forces the air through a metered plate
into the P2 connector side of the VXI modules. The air passing
over components in the modules absorbs heat and exits at the P1
side of the modules.
Cooling air is forced into the power supply at the bottom front of
the 1264C routed through the supply and exhausts at the bottom of
the unit.
The System Monitor features include a window comparator on
each VXIbus voltage, fan failure indicator, and a power supply
intake air temperature monitor. Each monitor includes a front panel
LED.
Refer to Figure 4-2 System Monitor Block Diagram and the
description below.
1264C User Manual
EADS North America Defense
Test and Services, Inc. © 1998
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