Emerson Process Management 53eA User Manual
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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.
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.
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.
below for assistance. Each section also contains hints for correcting other measurement and calibration problems.
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
and press Enter (F4). Use the
é or ê key to move up or down the list.
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
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
Failure eeprom
write verify error has occurred
16.2.9