DESCRIPTION AND OPERATION
POWER ENTRY PANEL
I-E96-508C
2 - 3
POWER ENTRY PANEL
The IEPEP04 Power Entry Panel connects single or redundant
24/48 VDC line power to an INFI 90 system cabinet. It also dis-
tributes power to the power modules and fan assembly. This
version has circuit breakers for each power line input. Two
modules reside in the PEP panel. They are the DC transfer
module and bus monitor module.
DC Transfer Module
The DC transfer module monitors both power inputs and its
own circuitry. If a power input is lost or faulty, the module
automatically transfers to the redundant input. The DC trans-
fer module generates a power fail interrupt signal if both lines
are lost or below the low voltage threshold. It sends this signal
to the bus monitor module. The bus monitor module sends the
PFI signal to the appropriate process control modules, thereby
interrupting their operation. Visible through the front panel
are three LEDs. The red and green LED at the top shows
whether the module is operating normally (green) or not (red).
The two other LEDs (line 1 and line 2) provide DC input status
(green = good, red = bad).
Bus Monitor Module
The bus monitor module monitors the regulated bus voltages (5
VDC,
±
15 VDC, and 24 VDC) and power module status from the
system power bus bar. A cable connection between the bus bar
and the J2 connector on the PEP panel provides the path. The
bus monitor module can also monitor two additional external
power supply voltages at the PEP terminal blocks. User-config-
ured jumpers allow the module to monitor either 24 VDC, 48
VDC or 125 VDC for up to two auxiliary power supplies. There
are two inputs for monitoring system status signals.
Jumpers are used to configure input status signals (low true
or high true). Also the status input one may be configured as
an additional PFI signal (low true). Two red and green LEDs on
the module faceplate provide status information. The topmost
LED shows whether the module is operating properly (green) or
not (red). The system status LED is red when voltages are low
or other inputs are bad. The status signal goes to the commu-
nication system hardware, which is the bus interface module
for plant loop systems, and the network interface slave for
INFI-NET
®
systems. On the communication loop, any INFI 90
operator interface can access the signal.
There are two alarms: PWR SYS ALARM and BUS VOLT
ALARM. The PWR SYS ALARM becomes active when a power
system problem occurs. The BUS VOLT ALARM becomes active
® INFI-NET is a registered trademark of Elsag Bailey Process Automation.
