Yokogawa EJX930A - Manual (Page 64)

<4. Diagnostics>
4-14
IM 01C25R02-01E
• Procedure to call up the display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Diag/Service → Diag
Parameters → Diag Output → Diag
Fixed Out Val →
DTM (HART 5) Diag and Service → Advanced Diag
Configurations → Diag Output → Diag
Out Option →
 Status Output for Advanced diagnostic
The output of the abnormal results are applicable
for a transistor output (open collector) of an on/off
signal according to the status of high and low alarm
limits, which are values set to Limit parameters as
shown in subsection 4.2.2.1. About the Flg temp Hi
Alert Val, or Flg temp Lo Alert Val for Heat trace
monitoring, refer to subsection 4.2.3.2.
 DO Select
If the advanced diagnostic function is installed, the
following modes can be also assigned to the status
output in addition to Pres, SP, Temp and Flow.
Mode Function
Diag Alarm The status regarding advanced diagnostic
masked by Diag Option is output.
All
All status of Press, SP, Temp, Flow and
advanced diagnostic are output.
 Alarm Display on LCD
If the ILBD algorithm detects the abnormality, the
content of the detected result is displayed with
“AL.88” or “AL.89” on the LCD. “AL.88” indicates
that condition is not applicable for the abnormality
detection and “AL.89” indicates the abnormality is
detected.
F0410.ai
Figure 4.7 Display Example of H Side Blocking
The alarm display on LCD regarding the advanced
diagnostic is described in Table 4.5.
NOTE
The alarms of “Invalid Ref xx” and “ILBD over
range” do not link to the 4-20 mA analog signal
and Status output.
4.2.2.6 Condition Check
After the EJX multivariable transmitter was
installed, it is necessary to confirm if Pres is
stable under the normal operating condition or if
fluctuation amplitude under the normal operating
condition is large enough to detect the blockage.
 Stability of Pressure Value
1) Observe the value change of Pres under the
normal operating condition for 10 minutes.
2) Confirm the value change is less than 10%.
• Procedure to call up the display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Detailed setup →
Sensors → Pres
DTM (HART 5) Configuration → Process Input → Pres
If the value change is more than 10%, the error
influences pressure fluctuation value so that the
blockage detection becomes impossible. Consider
the plant operating conditions.
 Fluctuation Value
NOTE
The blockage detection may not be carried
out correctly when pressure fluctuation
amplitude especially with the pressure and level
measurement, is small.
Confirm that each value of fDP, fSPl, fSPh, and
BlkF is more than the value specified in the below
table.
• Procedure to call up the fDP, fSPl, fSPh display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Diag/Service → Diag
Parameters → ILBD parameters →
Status → Fluct Variables → fDP/fSPl/
fSPh
DTM (HART 5) Diag and Service → Advanced Diag
Variables → fDP/fSPl/fSPh
• Procedure to call up the BlkF display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Diag/Service → Diag
Parameters → ILBD parameters →
Status → Diag Variables → BlkF
DTM (HART 5) Diag and Service → Advanced Diag
Variables → BlkF
Table 4.4 Requirements to apply ILBD
Condition
fDP 7×10 -10 or more
fSPI 1×10 -10 or more
fSPh 1×10 -10 or more
BlkF -0.5 to 0.5