<8. Maintenance>
8-5
IM 01W03D01-01EN
8.9 Replacing the HART Device
This subsection describes the procedure for
replacing the HART device.
Replace the HART device as follows.
One-to-one Connection
1. Remove the battery pack.
2. Disconnect the HART device from the FN310.
3. Connect the new HART device to the FN310. If
necessary, configure the HART device before
installing.
4. Remounting the battery pack.
4-20 mA Loop Connection
1. Switch off the power supplies of the 4-20 mA
loop.
2. Remove the battery pack.
3. Replace the HART device. If necessary,
configure the HART device before installing.
4. Supply power to the 4-20 mA loop.
5. Remounting the battery pack.
When replacing the HART device to different
models, configure the new HART device to the
FN310. For details about the settings, refer to
subsection 6.1 “Preparation for Starting Operation”.
8.10 Troubleshooting
If any abnormality appears in the measured values,
use the troubleshooting flow chart below to isolate
and resolve the problem. Since some problems
have complex causes, these flow charts may
not identify all. If you have difficulty isolating or
correcting a problem, contact Yokogawa service
personnel.
8.10.1 Basic Troubleshooting Flow
First determine whether the process variable
is actually abnormal or a problem exists in the
measurement system. If the problem is in the
measurement system, isolate the problem and
decide what corrective action to take.
FN310 is equipped with a self-diagnostic function
which will be useful in troubleshooting, and this
product is equipped with an integral indicator
and it will show an alarm code as a result of self-
diagnosis.
See subsection 8.10.3 “Errors and
Countermeasures” for the list of alarms.
YES
NO
F0811.ai
Abnormalities appear in
measurement
Is process variable
itself abnormal?
Isolate problem in
measurement system
Check/correct
operating conditions
Check transmitter
Check/correct
environmental conditions
Environmental condition
Operation conditions
Error in measurement
system
Transmitter itself
Inspect the
process system
: Areas where self-diagnostic
offers support
Measurement
system problem
Figure 8.5
Basic Troubleshooting Flow