Troubleshooting

11.23.4Erratic drive gain

Erratic drive gain can be caused by several problems. See Table 11-9.

Table 11-9Erratic 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.

 

 

11.23.5Low pickoff voltage

Low pickoff voltage can be caused by several problems. See Table 11-10.

Table 11-10Low 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.

 

 

11.24Checking 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.

Compensation

Measurement Performance

Troubleshooting

Defaults

Configuration and Use Manual

107

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Emerson Process Management 1500 manual 9Erratic drive gain causes and remedies, Low pickoff voltage

1500 specifications

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