The "relays/controls" menu
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5.4.3 "rake control"
(Part 1: Allocation)
"upstream water"
Specifies, which signal refers to the upstream level.
Selection:
• level 1 (default)
• level 2
"downstream water"
Specifies, which signal refers to the downstream level.
Selection:
• level 1
• level 2 (default)
"function"
Used to select the criterion for the detection of rake clogging.
Selection:
• difference (default)
Rake clogging is indicated if the difference L1 - L2 exceeds a critical value.
• ratio
Rake clogging is indicated if the ratio L2/L1 falls below a critical value.
5.4.4 "rake control"
(Part 2: Switching points)
"switch on point" and "switch off point"
Used to specify the limit values for detection of rake clogging. The meaning of these limit values
depends on the selected function.
"
Caution!
After a change of the "unit level" the switching points have to be checked an adjusted if required.
function = "difference"
In this case, the switch on and switch off points have to be specified in the level unit. The switch
on point must be larger than the switch off point.
The rake control relay is energized if the difference L1 - L2 rises above the switch on point. It is de-
energized if the difference falls below the switch off point.
⇒
rake control R1200
upstream water:
downstream water:
function:
⇒
rake control R1201
switch on point:
switch off point:
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