Emerson Micro Motion 2500, Configuration And Use Manual

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12.7 Frequency Output problems
Frequency Output problems and recommended actions Table 12-3:
Problem Possible causes Recommended actions
No Frequency Output • Stopped totalizer
• Process condition below cutoff
• Fault condition if Fault Action is set to Inter-
nal Zero or Downscale
• Two-phase 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 configu-
ration
• Wiring problem
• Verify that the process conditions are be-
low the low-flow cutoff. Reconfigure the
low-flow cutoff if necessary.
• Check the Fault Action settings.
• Verify that the totalizers are not stopped.
A stopped totalizer will cause the Frequen-
cy Output to be locked.
• Check for two-phase flow.
• Check flow direction.
• Verify the receiving device, and the wiring
between the transmitter and the receiving
device.
• Verify that the channel is wired and config-
ured as a Frequency Output.
• Verify the power configuration for the Fre-
quency Output (internal vs. external).
• Perform a loop test.
Consistently incorrect
frequency measure-
ment • Output not scaled correctly
• Incorrect measurement unit configured for
process variable
• Check the Frequency Output scaling.
• Verify that the measurement units are con-
figured correctly for your application.
Erratic Frequency
Output • Radio frequency interference (RFI) from
environment • Check for radio frequency interference.
Phase on Channel C
does not change with
flow direction • The Frequency Output mode is not config-
ured to show flow direction • Check the Frequency Output mode.
Cannot configure
Channel C for Fre-
quency Output opera-
tion • Invalid channel selections • FO and DO1 use the same circuitry and
cannot run simultaneously. Configure
Channel B as FO and Channel C as DO2.
12.8 Discrete output problems
Problem Possible causes Recommended actions
Cannot configure
Channel B to operate
as DO1 Invalid channel configuration FO and DO1 use the same circuitry and cannot
run simultaneously. Configure Channel B as FO
and Channel C as DO2.
Troubleshooting
176 Micro Motion Model 2500 Transmitters with Configurable Input/Outputs