DESCRIPTION AND OPERATION
POWER DISTRIBUTION
2 - 2 I-E96-506B1
®
POWER DISTRIBUTION
Bus bars distribute AC and DC power throughout the cabinet.
The AC bus bar has three separate conductor layers. The DC
bus bar has eight separate conductor layers. The use of bus
bars reduces hand wiring and improves reliability.
The input power bus bar distributes AC power from the power
entry panel to the module mounting unit (MMU) backplanes.
The bus bar has quick connect tabs to connect cables from the
panel to the mounting unit.
The eight layer system power bus bar distributes regulated DC
voltages, power module status and power fail interrupt signals.
This bus bar also has quick connect tabs. A cable from the
power entry panel to the system power bus bar allows the sys-
tem to monitor bus voltages and status signals. High current,
multiconductor flat cables connect regulated voltage outputs
and status signals from the MMU backplane to the bus bar.
Extra tabs are available at the bottom of the system power bus
bar. These tabs are for connecting +24 VDC I/O power to field
termination units or to other cabinets. Tabs are also available
to connect DC common and I/O common to the system com-
mon bus bar at the cabinet bottom.
POWER ENTRY PANEL
IEPEP01 and IEPEP02 Panels
The IEPEP01 and IEPEP02 Power Entry Panels connect a sin-
gle 120/240 VAC (50/60 hertz) line power to an INFI 90 system
cabinet and distribute power to the power modules and fan
assembly. The IEPEP01 panel has no circuit breakers, but the
IEPEP02 panel does.
There are two terminal blocks on each panel. One is for line
input, the other for output to the input power bus bar for distri-
bution to the power modules. The power entry panel has surge
suppression and filtering to protect the power modules. An
internal circuit board monitors input line voltage. It generates a
power fail interrupt (PFI) signal for low AC line or a loss of volt-
age. The panel mounts in any standard 19-inch rack frame.
IEPEP03 Panel
The IEPEP03 Power Entry Panel connects single or redundant
120/240 VAC (50/60 hertz) line power to an INFI 90 system
cabinet. It also distributes power to the power modules and fan
assembly. This version has circuit breakers for each power line
input. This panel also has surge suppression and filtering.
Two modules reside in the PEP panel. They are the AC transfer
module and bus monitor module.
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