Use Sensor Simulation For Troubleshooting - Emerson Micro Motion 1700 Configuration And Use Manual

Troubleshooting
Table 10-7: Frequency output problems and recommended actions
Problem Possible causes
No frequency output •
•
•
•
•
•
•
•
•
•
•
•
Consistently incorrect •
frequency measure- •
ment
Erratic frequency out- •
put
10.8

Use sensor simulation for troubleshooting

When sensor simulation is enabled, the transmitter reports user-specified values for mass
flow, temperature, and density. 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 flow value. If sensor simulation is enabled and the observed flow rate
does not match the simulated value, the source of the problem is likely to be somewhere
between the transmitter and the receiving device.
Important
When sensor simulation is active, the simulated value is used in all transmitter outputs and
calculations, including totals and inventories, volume flow calculations, and concentration
calculations. Disable all automatic functions related to the transmitter outputs and place the loop in
manual operation. Do not enable simulation mode unless your application can tolerate these effects,
and be sure to disable simulation mode when you have finished testing.
186
Stopped totalizer
Process condition below cutoff
Fault condition if fault action is set to in-
ternal zero or downscale
Slug flow
Flow in reverse direction from config-
ured flow direction parameter
Bad frequency receiving device
Output level not compatible with receiv-
ing device
Bad output circuit
Incorrect internal/external power con-
figuration
Incorrect pulse width configuration
Output not powered
Wiring problem
Output not scaled correctly
Incorrect flow measurement unit config-
ured
Radio frequency interference (RFI) from
environment
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 10.19.
• Verify that the totalizers are not stopped. A
stopped totalizer will cause the frequency
output to be locked.
• Check for slug flow. See
• Check flow direction. See
• Verify that the receiving device, and the wir-
ing between the transmitter and the receiv-
ing 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).
• Check the pulse width. See
• Perform a loop test. See
• Check the frequency output scaling. See
Section 10.21.
• Verify that the measurement units are con-
figured correctly for your application.
• Check for radio frequency interference. See
Section 10.13.
®
Micro Motion Model 1700 Transmitters with Analog Outputs
Section 10.25.
Section 10.23.
Section 10.20.
Section 10.12.