YOKOGAWA DPharp EJXC40A, Руководство пользователя

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<7. HART Communication>
7-39
IM 01C25W05-01EN
7.3.2.2.5 Alert and Alarm Setup
Diagnostic results such as blockage detection and
flange temperature error (heat trace monitoring)
can be confirmed with analog alerts and alarm
indications on the LCD. To display and output these
results, configure the alarm and alert settings by
following the procedure below.
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Storage of abnormal results
(Diag Error)
Alarm masking
(Diag Option)
Outside diagnosis
range/Invalid ref xx masking
Analog alert
Device Status
More Status Available
Additional Device Status
(Status group 15,16)
Alarm LCD
display
Figure 7.3.6 Alert and Alarm Setup
■ Alarm information
Error results detected by ILBD and heat trace
monitoring are stored in the Diag Error parameter.
Detected alarm information is displayed in the Diag
Error parameter.
Recall
parameters
[Root menu] → Diag/Service → Diag
Parameters → Diag Error
Bit Assignment Group
0 Not used
1 Not used
2 A Blocking
ILBD
3 Large Fluct Pres 2
4 Large Fluct Pres 1
5 Pres 2 Side Blocking
6 Pres 1 Side Blocking
7 B Blocking
8 Invalid Ref BlkF
9 Invalid Ref Pres 1
10 Invalid Ref Pres 2
11 Invalid Ref DP
12 ILBD over Range
13 Flg Temp Low Alarm Heat trace monitoring
14 Flg Temp High Alarm
15 Not used
■ ILBD over range
1) Lim DPAvgmax
The Lim DPAvgmax parameter indicates the
upper limit of the detectable range of ILBD. The
value can be changed when ILBD is stopped
(when the Diag Mode parameter is set to Stop).
DPAvg is a ratio representation of the average
of the measured differential pressure when the
maximum measurement span of the transmitter
is assumed to be 1.
When DPAvg exceeds the upper limit threshold,
an “ILBD over Range” alarm occurs, and ILBD
detection operation is no longer possible.
2) Lim DPAvgmin
The Lim DPAvgmin parameter indicates the
lower limit of the detectable range of ILBD. The
value can be changed when ILBD is stopped
(when the Diag Mode parameter is set to Stop).
When DPAvg falls below the lower limit
threshold, an “ILBD over Range” alarm occurs,
and ILBD detection operation is no longer
possible.
<Example>
If the range that can be measured by a transmitter
whose maximum measurement span is 100 kPa is
–80 kPa to 80 kPa, the upper and lower detection
limits are set as follows.
• Lim DPAvgmax: 0.80
• Lim DPAvgmin: -0.80
1.000
0.000
0.80
-0.80
-1.000
Detectable range
DPAvg
ILBD over Range
ILBD over Range
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