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3.
Pressing the right arrow key calculates proper alarm limits. Low limit is normally between 3
and 10 and high limit around 400 - 1000. They can be changed also manually. Drift alarm is
calculated to be 70 % value between paper and break.
Examples
Open draw
Auto-limit&Auto-alarm values:
Break: R: 6, G: 7, B: 8
Paper on: R: 104, G: 121, B: 144
Auto-limit calculation results:
1. B (blue light gives the highest difference), 144/8=18 (paper-
to- break "Ratio" = Normal to Break Ratio), 8 (blue level on "Break"), 144 (blue level on "Paper").
KPM KB2 selects blue light for break detection and sets "Detect(ion) limit" to 76 =((144+8)/2)
KPM KB2 sets detect "Direction" to "Break < Limit" = break relay activates as soon as B-signal
drops below 76.
Alarm settings:
Observed signal:
Select signal which is used for break detection (B in this case).
Low alarm Limit:
Set for example 3.
High alarm Limit:
Set for example 1000.
Drift Alarm:
Select required action of "Drift Alr", recommended "Report Only".
Drift al(arm) limit:
103 (= 0.70*(144-8)+ 8) = 70 % of range between paper on and break.
Drift al(arm) dir(ection):
Falling signal (Break < Limit).
Paper on red wire
Auto-limit&Auto-alarm values:
Break: R: 85, G: 24, B: 26
Paper on wire: R: 94, G: 125, B: 119
Auto-limit calculation results:
1. G (green light gives the highest difference), 125/24=5.2 (paper-
to-break "Ratio"), 24 (green level on "Break"), 125 (green level on "Paper").
KPM KB2 selects green light for break detection and sets the trigger point to 74 (= (125+24) /2).
Alarm settings:
Same way as above in chapter "Open draw".
Observed signal:
Select signal which is used for break detection (G in this case).
Low alarm Limit:
Set for example 3.
High alarm Limit:
Set for example 1000.
Drift Alarm:
Select required action of "Drift Alr", recommended "Report Only".
Drift al(arm) limit:
94 (= 0.70*(125-24)+24) = 70 % of range between paper on and break.
Drift al(arm) dir(ection):
Falling signal (Break < Limit).
