Yokogawa AXFA14G/C - Manual (Page 70)

IM 01E20F02-01E A-11
APPENDIX 2. INTEGRATOR (IT) BLOCK
A2.5 Output Process
There are the following three output parameters:
1. OUT
2. OUT_TRIP
3. OUT_PTRIP
Parameters OUT_TRIP and OUT_PTRIP are used only
when INTEG_TYPE is a value from 1 to 4.
In case of Integrator block related memory failed, the
status of OUT, OUT_TRIP, OUT_PTRIP becomes
“Bad-Device Failure”.
OUT.Value, OUT_TRIP.Status, and
OUT_PTRIP.Status are determined by the ratio of the
"Good" integrated values to all integrated values,
which is stored in PCT_INCL (0% to 100%). The user
must set the threshold value of each status to
UNCERT_LIM and GOOD_LIM.
The Integrator block determines the status of the output
using the three parameters: PCT_INCL,
UNCERT_LIM, and GOOD_LIM.
᭹ PCT_INCLмGOOD_LIM
⇒Good
᭹ UNCERT_LIMϹPCT_INCLϽGOOD_LIM
⇒Uncertain
᭹ PCT_INCLϽUNCERT_LIM
⇒Bad
If INTEG_TYPE is 5, 6, or 7, the status of the trip
output becomes "Good-NS-Constant."
0% UNCERT_LIM GOOD_LIM 100%
PCT_INCL
GOOD Uncertain Bad
PCT_INCL=100
ϫ(1 - (msp of RTotal)/(msp of ATotal))
msp of RTotal: RTotal value that is converted into a short floating-point number
msp of ATotal: ATotal value that is converted into a short floating-point number
RTotal: Integrated value of the absolute values of the increments whose status is bad
ATotal: Integrated value of the absolute values of the increments regardless of the output status
FA0204.EPS
Figure A2.4 Status of OUT, OUT_TRIP, and OUT_PTRIP Outputs
A2.5.1 Status Determination
The same criteria for determining the status of the
output of the Integrator block are used in common for
the above three parameters.