Emerson OCX 8800 Instruction Manual download pdf (Page 97)

Instruction Manual

IM-106-880 Original Issue

February 2005

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.

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Emerson OCX 8800 Instruction Manual Page 97