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2. If you changed the setting of Frequency Output Scaling Method, check the settings of all
other frequency output parameters.
10.22 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.
1. Check the status alarms for active fault conditons.
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.
• For the relevant status alarms, change the setting of Alarm Severity to Ignore.
3. If there are no active fault conditions, continue troubleshooting.
10.23 Check Flow Direction
If
Flow Direction is set inappropriately for your process, the transmitter may report
unexpected flow values or totals.
The Flow Direction parameter interacts with actual flow direction to affect flow values, flow
totals and inventories, and output behavior. For the simplest operation, actual process
flow should match the flow arrow that is on the side of the sensor case.
Procedure
1. Verify the actual direction of process flow through the sensor.
2. Verify the configuration of Flow Direction.
10.24
Check the cutoffs
If the transmitter cutoffs are configured incorrectly, the transmitter may report zero flow
when flow is present, or very small amounts of flow under no-flow conditions.
There are separate cutoff parameters for mass flow rate, volume flow rate, gas standard
volume flow rate (if applicable), and density. There is an independent cutoff for each mA
output on your transmitter. The interaction between cutoffs sometimes produces
unexpected results.
Procedure
Verify the configuration of the cutoffs.
Troubleshooting
184 Micro Motion
®
9739 MVD Transmitters