Emerson Rosemount MultiVariable 3051SMV, Справочное руководство

Страница: 57 / 112

49
Reference Manual
00809-0100-4853, Rev AB
Troubleshooting
January 2017
Troubleshooting
5.3.1 Fill fluid
The following performance limitations may inhibit efficient or safe operation. Critical applications should
have appropriate diagnostic and backup systems in place.
Pressure transmitters contain an internal fill fluid. It is used to transmit the process pressure through the
isolating diaphragms to the pressure sensor module. In rare cases, oil loss paths in oil-filled pressure
transmitters can be created. Possible causes include: physical damage to the isolator diaphragms,
process fluid freezing, isolator corrosion due to an incompatible process fluid, etc.
A transmitter with oil fill fluid loss may continue to perform normally for a period of time. Sustained oil
loss will eventually cause one or more of the operating parameters to exceed published specifications as
the operating point output continues to drift. Symptoms of advanced oil loss and other unrelated
problems include:

Sustained drift rate in true zero and span or operating point output or both

Sluggish response to increasing or decreasing pressure or both

Limited output rate or very nonlinear output or both

Change in output process noise

Noticeable drift in operating point output

Abrupt increase in drift rate of true zero or span or both

Unstable output

Output saturated high or low
5.4 Communication troubleshooting
Note
Use this section if other devices appear on the segment, communicate, and remain on the segment. If
other devices don't appear on the segment, communicate, or stay on the segment the electrical
characteristics of the segment should be checked.
Table 5-2. Troubleshooting Guide
Symptom Recommended actions
(1)
Device does not show
up on segment
Device power
1. Cycle power to device.
2. Ensure the device is connected to the segment.
3. Check voltage at terminals. There should be 9–30 V or 17.5 V for FISCO.
4. Check to ensure the device is drawing current. There should be approximately 17 mA.
Segment
1. Remove other devices from segment to check for interfering devices.
Incompatible network settings
1. Change host network parameters. Refer to host documentation for procedure.
Electronics failing
1. Electronics board loose in housing.
2. Replace electronics.