5-5
MODEL 54 C
SECTION 5
DIAGNOSTICS AND TROUBLESHOOTING
TABLE 5-2 Quick Troubleshooting Guide
SYMPTOM
ACTION
Wrong temperature reading.
Perform a temperature standardization. Verify sensor’s RTD
Suspected temp. compensation problem.
. Temperature is out of range of sensor.
“Temp. error high”
Check wiring.
“Temp. error low”
Display segments missing. Display not operable. Replace Display board.
Analyzer locks up; won’t respond.
Replace CPU board.
Erratic display and relays chattering.
Check alarm set points.
Analyzer not responding to key presses.
Verify and clean ribbon cable connection on CPU board.
Key press gives wrong selection.
Replace enclosure door/keyboard assy.
Wrong or no current output.
Verify that output is not being overloaded; remove load:
Replace Power board.
If still malfunctioning; replace the CPU board.
No display or indicators.
Verify that the removable fuse module is securely seated.
Alarm relay closure problems.
Check fuse on Power board.
Blows fuses.
Replace the Power board.
“Excess Input”
Check for sensor miswiring.
“Reverse Input”
Perform sensor zero.
“Hi reference drive”
Return instrument to authorized Rosemount service center.
“Lo reference drive”
“Check sensor zero”
Analyzer will not zero. Place sensor in air and access zero routine.
5.3 QUICK TROUBLESHOOTING GUIDE
Table 5-2 (below) identifies some of the more common symptoms and suggests actions to help resolve the prob-
lem. Refer to
for a complete list of diagnostic messages.
5.3.1 FIELD TROUBLESHOOTING.
When it is appar-
ent by grab sample analysis that the model 54C ana-
lyzer is giving inaccurate readings, the following pro-
cedure should be followed.
A.
A quick visual inspection of the installation may
expose the problem. Check to be sure that the
analyzer is mounted securely and that its internal
parts are properly held. Next check all input and
output wiring.
B.
The sensor should be checked to be certain that
the electrode surfaces are totally wetted by the
process and that air bubbles have not been
trapped in the vicinity of the electrodes. If air bub-
bles are found, the installation technique should
be altered to eliminate this source of error.
C.
If the previous two steps did not indicate the
source of the problem, the next step is to isolate
the problem to either the sensor or the Model 54C
analyzer.
NOTE
See flow chart on the following page for
further reference (
D.
The first step in troubleshooting the sensor is to
disconnect the sensor wires at the conductivity
monitor, remove the sensor from the process and
thoroughly dry the sensor electrodes. Refer to
sensor manual for additional troubleshooting
checks.
NOTE
The most frequent source of problems is wiring.
Summary of Contents for 54C
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