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Reference Manual
00809-0400-4728, Rev AA
June 2011
Rosemount 644
3-16
Troubleshooting Guides
Figure 3-1. 644 troubleshooting flowchart
Table 3-2. Troubleshooting guide.
Symptom
(1)
(1) The corrective actions should be done with consultation of your system integrator.
Cause Recommended Actions
Device does not show up on segment Unknown Recycle power to device
No power to device 1. Ensure the device is connected to the segment.
2. Check voltage at terminals. There should be 9–32Vdc.
3. Check to ensure the device is drawing current. There
should be approximately 10.5 mA nominal (11 mA max.)
Segment problems
Electronics failing 1. Replace device.
Incompatible network settings Change host network parameters.
Refer to host documentation for procedure.
Device does not stay on segment
(2)
(2) Wiring and installation 31.25 kbit/s, voltage mode, wire medium application guide AG-140 available from the Fieldbus Foundation.
Incorrect signal levels.
Refer to host documentation for
procedure.
1. Check for two terminators.
2. Excess cable length.
3. Bad Power supply or conditioner
Excess noise on segment.
Refer to host documentation for
procedure.
1. Check for incorrect grounding.
2. Check for correct shielded wire.
3. Tighten wire connections.
4. Check for corrosion or moisture on terminals.
5. Check for Bad power supply.
Electronics failing 1. Replace device.
Other 1. Check for water around the transmitter.
Device does not
appear on segment.
Problem Identified?
Yes
No
Perform Recommended
Action, see Table 3-2.
Check Segment, see “Device
does not stay on segment” in
Table 3-2 for more information.
Problem Identified?
Yes
No
Perform Recommended
Action, see page 3-6.
If the problem persists
contact your local
Rosemount representative.
PROBLEMS WITH COMMUNICATIONS
Device does not
stay on segment.
1. Check wiring to device.
2. Recycle power to device.
3. Electronic failure.
Refer to “Device does not show up on
segment” in Table 3-2 for more
information.