Yokogawa AXFA14G/C - Manual (Page 80)

IM 01E20C02-01E 8-4
8. OPERATION VIA HART COMMUNICATOR
8.4.3 Self-diagnostic
The self-diagnostic function of the AXFA14 is ex-
plained in Section 6.5 “Alarm Functions.”
The HART configuration tool can be used to run
self-diagnostics on a device and check for incorrect
data settings.
(1) Using DD
The Self test and Status commands are available for
self-diagnostics. When Self test is run, the display unit
shows an error code and alarm message if the device
detects any illegal parameter settings or functional
faults.
• Procedure to call up the Self test display
Device Setup
→ Diag/Service → Test → Self test
If no error is detected, “Self test OK” is displayed on
the configuration tool.
If the specific diagnostic item is known for the check,
you can directly call up the item by using the Status
command.
The status is categorized from 1 to 7.
Show an example below to confirm the status of Status
group 1.
• Procedure to call up the Status display
Device Setup → Diag/Service → Status → Status group 1
If no error is detected, “Off” is displayed on the
configuration tool.
If there is an error, “On” is displayed on the configura-
tion tool, and a countermeasure for that error is
necessary.
Example of display: Span > 10 m/s On
Span < 0.3 m/s Off
TTL > 10000 p/s Off
TTL < 0.0001 p/s Off
4-20 Lmt Err Off
The HART configuration tool diagnoses at each
communication.
When an improper operation is performed, the error
message is displayed.
(2) Using DTM
The Device Status commands are used for
self-diagnostics. When Device Status is run, the
display unit shows an error code and alarm message if
the AXFA14 detects any illegal parameter settings or
functional faults.
• Procedure to call up the Device Status display
Device Status
If no error is detected, “Status: Normal” is displayed
on the configuration tool.
If the specific diagnostic item is known for the check,
you can directly call up the item by using the Diagnos-
tic List in the Device Status display.
The Diagnostic List is categorized to Device Status,
Hardware Failure, Transducer Status, Diag Status, and
Configuration.
If no error is detected, color symbol which shows
Normal State is displayed on top of the error message.
If color symbol which shows Error State is displayed,
there is an error and a countermeasure for that error is
necessary.
The HART configuration tool diagnoses at each
communication.
When an improper operation is performed, the error
message is displayed.
8.4.4 HART Specific Functions
᭿ Trim Analog Output
This function is used to adjust the analog output at
4 mA and 20 mA with the D/A trim or Scaled D/A trim.
(1) D/A trim
Connect a calibration digital ammeter, and then
enter the read value of the ammeter for each output
of AXFA14.
• Procedure to call up the D/A trim display
DD Device Setup
→ Diagnosis/Service →
Adjustment
→ D/A trim
DTM Calibration
→ D/A trim
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(2) Scaled D/A trim
The output is adjusted by using a voltmeter or
other types of meters with 0 to 100% scale.
Example using a voltmeter:
4 mA DC
→ 1 V
20 mA DC
→ 5 V
Connect this meter, and enter the read value of the
meter for each output of AXFA14.
• Procedure to call up the Scaled D/A trim
display
DD Device Setup → Diagnosis/Service
→ Calibration
→ Analog output trim →Scaled D/A trim
DTM Calibration
→ Scaled D/A trim
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