Yokogawa EJX930A - Manual (Page 159)

<Appendix 8. Advanced Diagnostics>
A8-15
IM 01C25T02-01E
Relative
Index Index
Parameter Name
Factory
Default
Write
Mode
Explanation
73 2073 REF_LIM_FDPMIN 7.0E-10 AUTO Lower limit to judge whether REFERENCE_FDP is available for
ILBD operation. Writable only when Diag Mode is Stop(0).
74 2074 REF_LIM_FSPMIN 1.0E-10 AUTO Lower limit to judge whether REFERENCE_FSPL and
REFERENCE_FSPH are available for ILBD operation.
Writable only when Diag Mode is Stop(0).
75 2075 REF_LIM_BLKFMAX 0.5 AUTO Upper limit to judge whether REFERENCE_BLKF is available for
ILBD operation.
Writable only when Diag Mode is Stop(0).
76 2076 COMP_FLAG 0
(Compensation)
AUTO Whether RATIO_FDP is referred by CRATIO_FDP or NRATIO_FDP
is selected.
• Compensation(0)
• Non-Compensation(1)
77 2077 DIAG_LIM Refer to
Table A8.2
AUTO Set the ten threshold values for ILBD.
[1] Upper limit to detect “A Blocking”
[2] Lower limit to detect “B Blocking”
[3] Upper limit to detect “Large Fluctuation of Low Side”
[4] Lower limit to detect “Low Side Blocking”
[5] Upper limit to detect “Large Fluctuation of High Side”
[6] Lower limit to detect “High Side Blocking”
[7] Upper limit to detect “High Side Blocking” by using VALUE_
BLKF
[8] Lower limit to detect “Low Side Blocking” by using VALUE_BLKF
[9] Upper limit to detect “Outside Diagnosis Range”
[10] Lower limit to detect “Outside Diagnosis Range”
Writable only when DIAG_MODE is Stop(0).
78 2078 DIAG_COUNT 3 AUTO When the statistical value such as VALUE_FDP and VALUE_BLKF
exceeds consecutively the threshold by number of times preset to
this parameter, it is estimated that the impulse line is plugged.
Writable only when DIAG_MODE is Stop(0).
If the process fluctuation values are unsteady, increase this
numbers to enhance the accuracy of the blockage detection.
79 2079 REFERENCE_TIME 0x00000000 AUTO The date and time when the reference values were obtained are
automatically recorded when DIAG_MODE is set to Reference (2).
80 2080 REFERENCE_FDP 0x00, 0 AUTO The reference value of VALUE_FDP obtained at normal operating
condition is automatically recorded when DIAG_MODE is set to
Reference (2).
81 2081 REFERENCE_FSPL 0x00, 0 AUTO The reference value of VALUE_FSPL obtained at normal operating
condition is automatically recorded when DIAG_MODE is set to
Reference (2).
82 2082 REFERENCE_FSPH 0x00, 0 AUTO The reference value of VALUE_FSPH obtained at normal operating
condition is automatically recorded when DIAG_MODE is set to
Reference (2).
83 2083 REFERENCE_BLKF 0x00, 0 AUTO VALUE_BLKF obtained under normal condition.
84 2084 REFERENCE_
DPAVG
0x00, 0 AUTO The average value of differential pressure obtained at normal
operating condition is automatically recorded when DIAG_MODE is
set to Reference (2).
85 2085 VALUE_TIME — The date and time when the statistical values such as VALUE_FDP
and VALUE_BLKF were calculated are recorded.
86 2086 VALUE_FDP — Average value of the sum of squares of differential pressure/
pressure fluctuations.
87 2087 VALUE_FSPL — Average value of the sum of squares of low-pressure side static
pressure fluctuations.
88 2088 VALUE_FSPH — The average value of the sum of squares of low-pressure side static
pressure fluctuations.
89 2089 VALUE_BLKF — Blockage degree characterized in comparison of high-pressure side
and low-pressure side pressure fluctuation values.
90 2090 VALUE_DPAVG — Ratio of the average of differential pressure/pressure to the
maximum span of an EJX
91 2091 RATIO_FDP — CRATIO_FDP or NRATIO_FDP is used by COMP_FLG setting.
VALUE_FDP decreases and this parameter is used to determine
whether single or both side is plugged.