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OVERVIEW
I-E96-508C
1 - 1
SECTION 1 - INTRODUCTION
OVERVIEW
The INFI 90 DC input power system provides 5 VDC,
±
15 VDC,
and 24 VDC to power process control modules and field termi-
nation devices. The DC input power system uses a 24 VDC or
48 VDC input as the system supply voltage.
The system consists of the power entry panel (PEP), fan assem-
bly, power modules and their mounting unit, bus bars and
associated wiring. The power modules provide scalable power
for logic and I/O functions through N+1 redundancy. In this
type of redundancy, power modules equally share output. If
any power module fails, the remaining power modules adjust
their outputs to meet the total system load. Therefore, redun-
dancy can be provided by one extra power module beyond the
minimum number required to power the system.
INTENDED USER
The user should have a background in electricity and electron-
ics and be able to recognize shock hazards. Personnel working
with the DC modular power system must also be familiar with
electronic process control instrumentation and how to use
measuring instruments such as digital multimeters.
HARDWARE DESCRIPTION
Power Entry Panel
The IEPEP04 Power Entry Panel supplies DC line power to the
system cabinet. The IEPEP04 panel transfers redundant power
to the system cabinet and monitors system status. It contains
the DC transfer module and the bus monitor module which
perform these functions. The DC transfer module monitors line
voltage inputs to the system cabinet, provides automatic DC
line transfer (for redundant DC lines) and generates a power
fail interrupt (PFI) signal. The bus monitor module monitors
the power system and provides status and user alarm outputs.
Fan Assembly
The fan assembly provides air flow cooling for the power mod-
ules and process control modules in the system cabinet. The
IEFAN03 fan assembly is used in 24 VDC powered systems
and the IEFAN05 fan assembly is used in 48 VDC powered
systems.