Emerson 3051S Dokumentacja Strona 126

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14
Reference Manual
00809-0100-4803, Rev DA
Section 5: Troubleshooting
April 2013
Troubleshooting
Low Limited – Indicates the current variable reading has gone below the transmitter’s minimum
possible reading and is no longer representative of the actual variable measurement.
Constant – Indicates the variable reading is set to a fixed value. Example: The totalizer has been
stopped.
5.4 Engineering assistant communication
troubleshooting
Table 5-3 identifies the most common communication issues between the Engineering
Assistant software and the Rosemount 3051S MultiVariable Transmitter.
Table 5-3. Corrective action for engineering assistant communication problems
Symptom Corrective action
No Communication
between the Engineering
Assistant software and the
Rosemount 3051S
MultiVariable Transmitter
Loop Wiring (HART)
• HART protocol communication requires a loop resistance value between
250–1321 ohms, inclusive.
• Check for adequate voltage to the transmitter. See
“Load limitations”
on page 17
.
• Check for intermittent shorts, open circuits, and multiple grounds.
• Check for capacitance across the load resistor. Capacitance should be less
than 0.1 microfarad.
Engineering Assistant
• Verify correct COM port selected.
• Verify laptop computer is not in low energy mode
(certain laptops disable all COM ports in low energy mode).
• Check if HART modem is properly connected.
• Check if HART driver is loaded and installed. If using a HART USB port
modem, install drivers from CD-ROM provided with USB modem.
• Check if another HART configuration program, such as AMS, is currently
open. Only one HART configuration program may be opened at a time.
• Verify the COM port buffer setting is set to the lowest setting (1) in the
advanced COM port settings and re-boot the computer.
•Set the Device Address to search All.
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