Low Pickoff Voltage; 12.26 Checking The Core Processor; Checking The Core Processor Led - Emerson Micro Motion 1000 Series Configuration And Use Manual

Troubleshooting
Table 12-9 Erratic drive gain causes and remedies
Cause
Wrong K1 characterization constant for sensor
Polarity of pick-off reversed or polarity of drive reversed
Slug flow
Foreign material caught in flow tubes
12.25.5

Low pickoff voltage

See Table 12-10 for a list of possible causes of low pickoff voltage.
Table 12-10 Low pickoff voltage causes and remedies
Cause
Faulty wiring runs between the sensor and core processor
Process flow rate beyond the limits of the sensor
Slug flow
No tube vibration in sensor
Moisture in the sensor electronics
The sensor is damaged

12.26 Checking the core processor

Two core processor procedures are available:
• You can check the core processor LED. The core processor has an LED that indicates different
meter conditions. See Table 12-11.
• You can perform the core processor resistance test to check for a damaged core processor.
12.26.1

Checking the core processor LED

To check the core processor LED:
1. Determine your installation type. See Section 1.3 and refer to Appendix B for diagrams.
2. Maintain power to the transmitter.
3. If you have a 4-wire remote installation or a remote core processor with remote transmitter
installation:
a. Remove the core processor lid. The core processor is intrinsically safe and can be opened
in all environments.
b. Check the core processor LED against the conditions described in Table 12-11 (standard
core processor) or Table 12-12 (enhanced core processor).
c. To return to normal operation, replace the lid.
152
Possible remedy
Re-enter the K1 characterization constant. See
Section 6.2.
Contact Micro Motion. See Section 12.3.
See Section 12.17.
Purge flow tubes or replace sensor.
Possible remedy
Verify wiring. Refer to Appendix B for diagrams, and see
your transmitter installation manual.
Verify that the process flow rate is not out of range of the
sensor.
See Section 12.17.
Check for plugging.
Ensure sensor is free to vibrate (no mechanical binding).
Verify wiring.
Test coils at sensor. See Section 12.27.
Eliminate the moisture in the sensor electronics.
Contact Micro Motion.
Micro Motion Series 1000 and Series 2000 Transmitters