
2104349 rev. AD
Page 5
–5
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A/D Converter is over or under range (DP, SP or Tf)
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Loose wiring connections
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Faulty RTD probe
If the A to D Converter readings are within range, AD is shaded.
5.2.3.1
Step-by-step instructions
1) Begin by collecting data from the unit.
2) View the Event log in PCCU32 for codes (see PCCU32 Help Files for more
information).
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99 A/D converter could not be read.
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100 A/D converter could be read again.
3) If the event code is found, follow the guidelines for returning the transducer
to Totalflow for repair or replacement. If the event code is not found,
continue to the next step.
4) In the PCCU32 Entry screen, monitor the readings by clicking on the I/O
Subsystem in the tree-view and selecting Onboard and Analog Inputs.
Check SP, DP and temperature to determine which measurement channel
is causing the alarm.
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If the alarm is caused by the SP or DP channel, equalize and vent the
manifold.
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If the alarm disappears: the SP or DP cell is not ranged properly, or
the manifold may have blockage.
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If the alarm is still present, replace the transducer.
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If the alarm is caused by the temperature channel, move to Step 9;
otherwise, move to the next step.
5) Set the EXIMV back to Factory calibration. If this corrects the alarm,
recalibrate the EXIMV to correct field calibration. If the alarm is not
corrected, continue to the next step.
6) Perform a Warm start on the unit. Verify that the unit is not displaying a LL
(Low Lithium) alarm, and then remove power from the unit. Restore power
to the unit. If the A/D Failure alarm is not corrected, continue to the next
step.
7) Perform the Save and Restore function. Follow the procedure in Chapter 4
for backing up configuration files. The user must ensure that they restore
these files to the tfCold drive.
8) Following the reset procedures covered in this chapter, perform a Cold start
on the unit. If the problem is not corrected, continue to the next step.
9) Check the RTD wiring at the EXIMV.
10) Perform the following three procedures found next in this chapter.
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RTD Continuity Test
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RTD Resistive Test
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RTD Impedance Test
11) Contact Totalflow to repair or replace the EXIMV.
Summary of Contents for XSeries G4 6200
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