Emerson Micro Motion 5700 - Check for Internal Electrical Problems; Check Frequency Output Fault Action

Table 17-2: Possible causes and recommended actions for excessive (saturated) drive gain (continued)
Possible cause Recommended actions
Over-pressurized tubes Contact customer support.
Plugged sensor tube Check the pickoff voltages (see Check the pickoff voltage). If either of them are close to
zero (but neither is zero), plugged tubes may be the source of your problem. Purge the
tubes. In extreme cases, you may need to replace the sensor.
Sensor case full of process
fluid
Replace the sensor.
Sensor imbalance Contact customer support.
Sensor tubes not
completely full
Correct process conditions so that the sensor tubes are full.
Two-phase flow Check for two-phase flow. See Check for two-phase flow (slug flow).
Vibrating element not free
to vibrate
Ensure that the vibrating element is free to vibrate.
Erratic drive gain
Table 17-3: Possible causes and recommended actions for erratic drive gain
Possible cause Recommended actions
Foreign material caught in sensor
tubes
• Purge the sensor tubes.
• Replace the sensor.
17.19 Check for internal electrical problems
Shorts between sensor terminals or between the sensor terminals and the sensor case can cause the sensor to
stop working.
Possible cause
Recommended action
Liquid or moisture inside the sensor case Contact customer support.
Internally shorted feedthrough Contact customer support.
Faulty cable Replace the cable.
17.20 Check Frequency Output Fault Action
The Frequency Output Fault Action controls the behavior of the Frequency Output if the transmitter
encounters an internal fault condition. If the Frequency Output is reporting a constant value, the transmitter
may be in a fault condition.
Procedure
1. Check the status alerts for active fault conditions.
2. If there are active fault conditions, the transmitter is performing correctly. If you want to change its
behavior, consider the following options:
• Change the setting of Frequency Output Fault Action.
Configuration and Use Manual Troubleshooting
MMI-20025166 March 2019
Configuration and Use Manual 287