IFM Electronic LK7 Bedienungsanleitung Seite 27

Applications
Storage tank
OFS
Monitoring of the acceptable range (alarm) and level control
Switching output 1 (refilling)
upper preset value reached → finish refilling
below lower preset value → start refilling
hysteresis function, normally closed (Hnc)
Switching output 2 (safety function min - max)
max. value exceeded → alarm
below min. value → alarm
window function, normally open (Fno)
L
refill
SP2
SP1
rP1
rP2
OUT1 1
Hnc
0
OUT2
1
Fno
0
If the level is below rP1, output 1 switches until liquid is refilled. If SP1
is reached again, output 1 switches back.
If the level is below rP2 or above SP2 or if there is a wire break, output
→
2 switches OFF ( alarm).
The logical operation between the outputs 1 and 2 indicates whether
there is overflow or the actual level is below the minimum level.
• Overflow: output 1 switched off and output 2 switched off.
• Below min. value: output 1 switched on and output 2 switched off.
max. monitoring
min. monitoring
t
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