Page 271 - IRSEM_Main Book

Example of Fault
Fault Name Ref: Fault Information Momentary Confirmed
Message
23 Check for Passing of Danger a) When track 2 is DN after track 1 is DN and RECR is UP.
Signal b) The time difference between T2 DN and T3 UP is
more than 5 Sec.
c) The time difference between T2 DN and RECR UP is
more than 5 Sec.
d) T2 is not bobbing and is DN for more than 1.2 Sec.
SPAD CASES
1. Multiple signals (stop, shunt and calling on) on the
same post (When RECR is Up, SH/HECR, COECR are
Down, Corresponding Point indication and TPR1,
TPR2 are Down, TPR3 is Up and time difference
between TPR2 Down (triggering) and TPR3 Up is
more than time T1,and the time difference between
S1 Check for
TPR2 Down and RECR Up is more than the given
RDSO C Passing of Danger
time interval T1, TPR2 is continuously Down for T2.
Signal
T2 is triggering.
2. Two signals on different lines ex. starters) with first
controlling track common and point selection. Point
selection to be used for each signal apart from the
above logic.
3. Two signals on the same line reading to the same line on
different posts (home and shunt) home signal
ASR/ALSR/G(R)LR to be used in shunt signal SPAD logic.
4. Two opposite signals (ex. starter and opposite shunt
from siding) with one track circuit in between and no
approach track circuit for shunt signal -- in starter
signal SPAD logic use shunt GNR/UNR not operated
condition or Conflicting HR Down.

Chapter 11: Dataloggers and Predictive Maintenance Systems Page 230 of 535