The "Relay/Controls" menu
91
"alternate"
Specifies if the pump should be included in the alternating pump control.
Selection
• no (default)
The pump is not included in the alternating pump control. Instead, it switches according to its
own switch points.
• yes
The pump is included in the alternating pump control.
"crust reduction"
Specifies a range of inaccuracy (percentage of the measuring range) for the switching points of the
pump. If this value is larger than "0", the switching points are not exactly constant. Instead, they
vary within the specified range of inaccuracy.
This helps to avoid crust formation, which often occurs at fixed switching points.
L00-FMU90xxx-19-00-00-yy-056
A: switch-on point; B: switch-off point; C: pump on; D: pump off; E: inaccuracy ("crust reduction")
8.3.7 "pump M/control N" (M = 1 - 6, N = 1 or 2)
(Part 2: Switching behavior for limit control)
"backlash interval" and "backlash time"
Use these parameters if, you want to empty a vessel beyond the switch-off point in regular intervals.
The "backlash interval" determines after which time this extended pumping will occur.
The "backlash time" determines how long this additional pumping lasts.
L
t
t
A
B
C
D
E
E
⇒
pumpM/controlN RN304
backl. interval:
backlash time:
error handling:
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