Emerson ROSEMOUNT OCX 8800 - Manual (Page 99)

Instruction Manual
IM-106-880, Rev 1.0
January 2007
OCX 8800
http://www..raihome.com
Section 7 Troubleshooting
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-1
Diagnostic Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-2
Fault Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-3
Alarm Relay Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-11
OVERVIEW The troubleshooting section describes how to identify and isolate faults that
may develop in the OCX 8800. When troubleshooting the OCX 8800,
reference the following information.
Grounding It is essential that adequate grounding precautions are taken when installing
the system. Thoroughly check both the probe and electronics to ensure the
grounding quality has not degraded during fault finding. The system provides
facilities for 100% effective grounding and total elimination of ground loops.
Electrical Noise The OCX 8800 has been designed to operate in the type of environment
normally found in a boiler room or control room. Noise suppression circuits
are employed on all field terminations and main inputs. When fault finding,
evaluate the electrical noise being generated in the immediate circuitry of a
faulty system. Ensure all cable shields are connected to earth.
Electrostatic Discharge Electrostatic discharge can damage ICs in the electronics. Before removing or
handling the processor board or the ICs, ensure you are at ground potential.
Install all protective equipment covers and safety ground leads after troubleshooting.
Failure to install covers and ground leads could result in serious injury or death.