Frequency Output Problems - Emerson Micro Motion 9739 MVD Configuration And Use Manual

Table 10-6 Milliamp output problems and recommended actions
Problem Possible causes
Consistently
incorrect mA
measurement
mA output correct
at lower current, but
incorrect at higher
current
10.7

Frequency output problems

Table 10-7 Frequency output problems and recommended actions
Problem Possible causes
No frequency output
Configuration and Use Manual
• Output not trimmed correctly
• Incorrect flow measurement unit
configured
• Incorrect process variable configured
• LRV and URV are not set correctly
• mA loop resistance may be set too
high
• Process condition below cutoff
• Fault condition if fault indicator is set
to internal zero or downscale
• Slug flow
• Flow in reverse direction from
configured flow direction parameter
• Bad frequency receiving device
• Output level not compatible with
receiving device
• Bad output circuit
• Incorrect internal/external power
configuration
• Incorrect pulse width configuration
• Output not powered
• Wiring problem
continued
Recommended actions
• Check the mA output trim. See Section
10.16 .
• Verify that the measurement units
are configured correctly for your
application.
• Verify the process variable assigned
to the mA output.
• Check the settings of Upper Range Value
and Lower Range Value. See Section
10.17 .
• Verify that the mA output load
resistance is below maximum
supported load (see the installation
manual for your transmitter).
Recommended actions
• Verify that the process conditions are
below the low-flow cutoff. Reconfigure
the low-flow cutoff if necessary.
• Check the Fault Action settings. See
Section 10.18.
• Verify that the totalizers are not stopped.
A stopped totalizer will cause the
frequency output to be locked.
• Check for slug flow. See Section 10.24.
• Check flow direction. See Section 10.22.
• Verify that the receiving device, and the
wiring between the transmitter and the
receiving device
• Verify which wiring terminals are
configured for frequency output.
• Perform a loop test.
• Verify that the power configuration for the
frequency output (internal vs. external).
• Check the pulse width. See Section
10.20 .
Troubleshooting
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