<8. Maintenance>
8-5
IM 01W03D02-01EN
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 “Errors and Countermeasures” in the section 9
“Device Connection Type” for the list of alarms.
YES
NO
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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
8.10.3 Errors and Countermeasures
For errors and countermeasures, refer to section 9
“Device Connection Type”.
8.10.2 Example of Troubleshooting Flow
The following shows an example of the flow for
troubleshooting.
Refer to this example and Table 8.3. Locate
the problem and take the corresponding
countermeasure.
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YES
NO
The following phenomena indicate that this
instrument may be out of operation.
[Example]
•
No output signal is delivered.
•
Process variable changes but the output
signal remains unchanged.
•
The assessed value of the process variable
and the output are not coincident.
Refer to our service personnel for details.
•
If a built-in indicator is attached, check the
display of the error code.
•
Connect the device configuration tool and
check self-diagnosis.
Refer to the error
message list and
check for recovery
measures.
Is
the Modbus Device
correctly connected?
Check the HART
Device connection
and correct it.
NO
YES
YES
Is
the wireless device
connection correct?
Connect the
wireless devices
again.
NO
Did self-diagnosis
find an error?
Figure 8.6
Example of Troubleshooting Flow
Table 8.3
Cause and Countermeasure
Observed Problems
Possible Cause
Countermeasure
Related Parameter
Outputs fixed current.
The simulation function is
set to On
Set the simulation function
to Off.
• Simulate Switch
Parameters cannot be changed.
This product is in write
protect status.
Release write protect.
• UAP Option
• Hardware Write Protect
