DESCRIPTION AND OPERATION
POWER ENTRY PANEL
I-E96-506B1 2 - 3
AC Transfer Module
The AC transfer module (ATM) monitors both the AC inputs
and its own circuitry. If an AC input is lost or faulty, the mod-
ule automatically transfers to the redundant input. The ATM
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 (BMM). The BMM module sends the
PFI signal to the appropriate process control modules, thereby
interrupting their operation.
Visible through the front panel are three LED indicators. The
red/green LED at the top shows whether the module is operat-
ing normally (green) or not (red). The two other LEDs (LINE 1
and LINE 2) provide AC input status (green = good, red = bad).
Bus Monitor Module
The bus monitor module (BMM) monitors the regulated bus
voltages (+5, +15, -15 and +24 VDC) and module status from
the distribution bus bar. A cable connection between the bus
bar and the J2 connector on the PEP panel provides the path.
The BMM 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, 48 or
125 VDC for up to two auxiliary power supplies.
There are two contact inputs (NO or NC) for monitoring system
status signals. Two red/green LEDs on the module faceplate
provide status information. The top-most LED shows whether
the module is operating properly (green) or not (red). The sys-
tem status LED is red when voltages are low or other inputs
are bad. The status signal goes to the communication system
hardware, which is the bus interface module for Plant Loop
systems, and the network interface module for INFI-NET
®
sys-
tems. Once on the communication loop, any INFI 90 operator
interface can use 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
when any bus voltage (+5, +15, -15 or +24 VDC) falls out of tol-
erance. The BMM module also generates a power fail interrupt
(PFI) signal if it receives a PFI from the AC transfer module, or if
the +5 VDC bus voltage is low. It distributes this signal to pro-
cess control modules in the INFI 90 system cabinet.
NOTE:
The bus monitor module receives power from the AC trans-
fer module. Therefore, the AC transfer module must be in place and
operating properly before the bus monitor module will work.
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