DESCRIPTION AND OPERATION
FAN ASSEMBLY
2 - 4 I-E96-506B1
®
FAN ASSEMBLY
The IEFAN01 and IEFAN02 fan assemblies contain six fans
that mount in one chassis. Their purpose is to keep the power
and system modules cool. The fans draw cooling air up
through the module mounting assemblies and force it through
exhaust vents (when present) in the top of the cabinet door.
MODULE MOUNTING UNIT
The IEMMU01 and IEMMU02 Module Mounting Units provide
mounting for the power modules and process control modules.
Two five-conductor flat cables link the power fail interrupt and
power module status signals, +5, +15, -15 and +24 VDC from
the DC bus bar to the MMU card cage. A three-wire cable from
the AC bus bar to the MMU backplane supplies the power
modules with AC.
Cables connect the communication busses between multiple
MMU card cages. The module bus uses a three-wire, twisted
cable, while the I/O expander bus uses a flat, 40-conductor
ribbon cable.
POWER MOUNTING UNITS
The IEPMU01 and IEPMU02 Power Mounting Units mount and
segregate power modules from INFI 90 process modules. Each
PMU card cage is open on the top and bottom for air flow.
There are 12 pairs of guides for mounting power modules, two
side plates and the backplane. The power mounting unit back-
plane uses bus bars rather than traces for heavier currents.
POWER MODULES
The IEPAS02 System Power Module converts the 120/240 VAC
at the MMU backplane to a primary voltage of 325 VDC nomi-
nal. The DC-to-DC converters convert the primary voltage to
secondary regulated voltages of +5, +15, -15 and +24 VDC.
These voltages travel through the system power bus bar to
other module mounting units for distribution to process con-
trol modules (see Figures 2-2 and 2-3). The power modules can
be inserted or removed from their mounting unit while under
power.
The IEPAF02 Field Power Module is functionally the same as
the IEPAS02 module except that it provides only +24 VDC. The
IEPAF02 provides power to field termination devices when
using separate termination cabinets, or when it is desirable to
separate the I/O power supplies from the system power
supplies.
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