Troubleshooting Fieldbus Diagnostics - Emerson AMS Trex User Manual

Fieldbus Diagnostics application
5.14

Troubleshooting Fieldbus Diagnostics

If you see a measurement labeled BAD or CHECK, tap Details to view the values for each
measurement. Press and hold a measurement value on the screen to view Help that
describes overview or troubleshooting information. You can also access the Help menu by
holding the checkmark button on the keypad when a measurement value is selected.
Note
To prevent inaccurate BAD or CHECK readings, review the measurement criteria in the Settings, and
set the minimum and maximum values to ensure they are appropriate for your installation.
Figure 5-11:
DC voltage measurement
Lower than expected
174
Help text example
Possible cause
The power supply's voltage
setting may be set too low.
An unexpected voltage drop
may be due to a damaged
cable, corrosion in the
terminals, low impedance to
ground, water in the device
terminals, or loose connections.
Action
Verify the power supply's
voltage setting is correct. If
necessary, increase the power
supply voltage.
Measure the voltage at several
points on the fieldbus segment
to determine the location of the
unexpected voltage drop. Start
at the power supply and
continue toward the original
measurement point where the
voltage was measured low.
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