Emerson Process Management IB106-340 Section Troubleshooting, Alarm Indications, Alarm Contacts

Oxymitter 4000

Instruction Manual

IB-106-340 Rev. 2.4 April, 2001

SECTION 7

TROUBLESHOOTING

Install all protective equipment covers and safety ground leads after trouble- shooting. Failure to install covers and ground leads could result in serious injury or death.

7-1 GENERAL

The troubleshooting section describes how to identify and isolate faults that may develop in the Oxymitter 4000. Also, additional troubleshooting information is provided in paragraph 7-5for those units with the optional SPS 4000. When trouble- shooting the Oxymitter 4000, reference the fol- lowing information.

a.Grounding

It is essential that adequate grounding pre- cautions are taken when installing the sys- tem. 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 the total elimination of ground loops.

b.Electrical Noise

The Oxymitter 4000 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. Also, ensure all cable shields are connected to earth.

c.Loose Integrated Circuits

The Oxymitter 4000 uses a microprocessor and supporting integrated circuits (IC). If the electronics are handled roughly during in- stallation or located where subjected to se- vere vibration, the ICs could work loose. Before troubleshooting the system, ensure all ICs are fully seated.

d.Electrostatic Discharge

Electrostatic discharge can damage the ICs used in the electronics. Before removing or handling the processor board or the ICs, ensure you are at ground potential.

7-2 ALARM INDICATIONS

The majority of the fault conditions for the Oxy- mitter 4000 will be indicated by one of the four LEDs referred to as diagnostic, or unit, alarms on the operator’s keypad. An LED will flash a code that will correspond to an error message. Only one LED will blink at a time. An alarm code guide is provided inside the screw cover for the electronics. All alarm indications will be avail- able via the HART Model 275 handheld com- municator and Rosemount’s Asset Management software. When the error is corrected and/or

power is cycled, the diagnostic alarms will clear 7 or the next error on the priority list will appear.

7-3 ALARM CONTACTS

a.If autocalibration is not utilized, a common bi-directional logic contact is provided for any of the diagnostic alarms listed in Table 7-1.The assignment of alarms which can actuate this contact can be modified to one of seven additional groupings listed in Table 5-1.

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 7-1