Emerson Process Management 53eA Section Troubleshooting, Overview, Measurement Section

MODEL 54eA	SECTION 16.0
	TROUBLESHOOTING

SECTION 16.0

TROUBLESHOOTING

16.1 OVERVIEW

The 54eA controller continuously monitors itself and the sensor for faults. When the controller detects a fault in the amperometric or pH sensor or in the instrument itself it displays a fault message. If alarm 4 was enabled, the red FAIL LED will also light and relay 4 will activate. The outputs will go to 22.00 mA or to the value programmed in Section 5.6.

Special rules apply to pH sensor diagnostics (high and low glass impedance). Alarm 4, the FAIL LED, and the out- put current failure mode will operate only if pH sensor diagnostics have been enabled. See Section 5.8.

See Section 16.2 for an explanation of fault messages and suggested corrective actions.

The controller also displays error and warning messages if a calibration is seriously in error. Refer to the section below for assistance. Each section also contains hints for correcting other measurement and calibration problems.

Measurement	Section
Temperature	15.3
Dissolved oxygen	15.4
Free chlorine	15.5
Total chlorine	15.6
Monochloramine	15.7
Ozone	15.8
pH	15.9

For troubleshooting not related to measurement problems, see Section 16.10.

To view diagnostic variables, go to the main display and press any key. Move the cursor to “Diagnostic variables” and press Enter (F4). Use the é or ê key to move up or down the list.

16.2 TROUBLESHOOTING WHEN A FAULT MESSAGE IS SHOWING

	Fault message	Explanation	See Section
	High input current	input current exceeds 210 uA	16.2.1
	Check sensor zero	sensor current was too high when sensor was zeroed	16.2.2
	pH low input voltage	input voltage is less than -1400 mV	16.2.3
	pH high input voltage	input voltage exceeds 1400 mV	16.2.3
	pH low reference voltage	input voltage is less than -1600 mV	16.2.4
	pH high reference voltage	input voltage exceeds 1600 mV	16.2.4
	Old glass warning	glass impedance exceeds high limit	16.2.5
	Cracked glass failure	glass impedance is less than low limit	16.2.6
	Temp error low	temperature less than -15°C	16.2.7
	Temp error high	temperature greater than 130°C	16.2.7
	Sense line open	RTD sense line is open	16.2.8
	Failure factory	instrument needs factory calibration	16.2.9
86	Failure eeprom	write verify error has occurred	16.2.9