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Configuration and Use Manual 107
Troubleshooting
Measurement Performance DefaultsTroubleshootingCompensation
11.23.4 Erratic drive gain
Erratic drive gain can be caused by several problems. See Table 11-9.
11.23.5 Low pickoff voltage
Low pickoff voltage can be caused by several problems. See Table 11-10.
11.24 Checking the core processor
The
Core Processor Diagnostics window displays data for many operational variables that are
internal to the core processor. Both current data and lifetime statistics are shown.
To view the core processor data, select
Core Processor Diagnostics from the ProLink menu.
From this window:
• You can reset lifetime statistics by pressing the
Reset Lifetime Stats button.
• You can also change values for electronic offsent, sensor failure timeout, drive P coefficient,
drive I coefficient, target amplitude override, and target frequency. Contact Micro Motion
customer service before changing these values.
Additionally, two core processor procedures are available:
• You can check the core processor LED. The core processor has an LED that indicates different
flowmeter conditions. See Table 11-11.
• You can perform the core processor resistance test to check for a damaged core processor.
Table 11-9 Erratic drive gain causes and remedies
Cause Possible remedy
Wrong K1 characterization constant for sensor Re-enter the K1 characterization constant. See
Section 4.2.
Polarity of pick-off reversed or polarity of drive reversed Contact Micro Motion. See Section 1.8.
Slug flow See Section 11.17.
Foreign material caught in flow tubes Purge flow tubes.
Table 11-10 Low pickoff voltage causes and remedies
Cause Possible remedy
Faulty wiring runs between the sensor and core processor Verify wiring. Refer to Appendix B for diagrams, and see
your transmitter installation manual.
Process flow rate beyond the limits of the sensor Verify that the process flow rate is not out of range of the
sensor.
Slug flow See Section 11.17.
No tube vibration in sensor Check for plugging.
Ensure sensor is free to vibrate (no mechanical binding).
Verify wiring.
Test coils at sensor. See Section 11.25.
Moisture in the sensor electronics Eliminate the moisture in the sensor electronics.
The sensor is damaged Contact Micro Motion. See Section 1.8.