10.7 Frequency Output problems
Frequency Output problems and recommended actionsTable 10-3:
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.
10.8 Using sensor simulation for troubleshooting
When sensor simulation is enabled, the transmitter reports user-specified values for basic
process variables. This allows you to reproduce various process conditions or to test the
system.
You can use sensor simulation to help distinguish between legitimate process noise and
externally caused variation. For example, consider a receiving device that reports an
unexpectedly erratic density value. If sensor simulation is enabled and the observed
density value does not match the simulated value, the source of the problem is likely to be
somewhere between the transmitter and the receiving device.
Sensor simulation requires an Enhanced Core and a communication device.
Troubleshooting
136 Micro Motion Model 1500 Transmitters with Analog Outputs
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