INTRODUCTION
I-E96-506B1 5 - 1
INTRODUCTION
This section provides troubleshooting tools to help you locate
and correct modular power system problems. These are gen-
eral troubleshooting procedures and are not exhaustive of all
possible causes.
TROUBLESHOOTING FLOWCHARTS
The flowcharts in Figures 5-1 and 5-2 represent basic trouble-
shooting procedures for the IEPEP01, IEPEP02 and IEPEP03
Power Entry Panels.
IEPEP01 and IEPEP02 Systems
Systems with an IEPEP01 or IEPEP02 Power Entry Panel only
monitor the AC power input. There are no bus voltage or other
power system status indicators on the power entry panel. If AC
input power is lost or goes low, a power fail interrupt (PFI) sig-
nal is sent to the process control modules. Figure 5-1 shows a
troubleshooting flowchart for IEPEP01 and IEPEP02 systems.
To troubleshoot the system:
1. Check system and I/O power. If system and I/O power are
good, an overload condition may exist in the power modules.
2. Check for red status LEDs on the power modules.
3. If there are power modules with red LEDs, install additional
power modules.
4. Check power modules that had red LEDs. If they are still
red, they have failed. Remove and replace them.
5. Check the PFI signal. If it is good, there is a power entry
panel failure. Replace the power entry panel. This should be
done by a qualified service technician.
IEPEP03 Systems
Any power system problem will cause a bad status flag at the
operator interface. This alarm appears under the S group on
the system status display of an operator interface station (OIS),
management command system (MCS), or LAN-90 process con-
trol view computer. Additionally, the LEDs on the power sup-
ply, bus monitor or AC transfer module go red to indicate bad
SECTION 5 - TROUBLESHOOTING
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