The "Relay/Controls" menu
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L00-FMU90xxx-19-00-00-yy-053
1: Alternating pump control; that pump is switched on (switched off), which has been switched off (switched on) the
longest time.
2: Non-alternating pump control; each switching point is allocated to a different pump.
A: switch-on point of the pump; B: switch-off point of the pump; C: pump on; D: pump off;
Limit control versus pump rate control
If several pumps are connected, you can choose between limit control (as described above) and
pump rate control.
Limit control
If limit control has been selected, the relays are switched according to the swichting points as
described above.
Pump rate control
If pump rate control has been selected, there is only one switch-on point and one switch-off point,
which are valid for all relays. Additionally, a desired pump rate has to be specified.
If the level rises above (or falls below) the switch-on point, initially only one pump is switched on.
If the desired pump rate has not been achieved after the selected hook-up interval, an additional
pump is switched on. Similarly, further pumps are switched on in intervals until the desired pump
rate has been achieved.
P1
P1
P1
P2
P2
P3
P3
P2
P3
t
L
P1 P2 P3
A
A B
A B
B
C
C
C
C
C
C
D
D
D
D
D
1
2
D
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