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7
Switching behavior
The switching levels determine when the pump(s) is (are) switched on or off. When the controller is
operated using a continuous level measuring system (level sensor or impact pressure method), then
the measured levels are directly processed and evaluated. When the controller operates with float
switches, then the switching states of the floats determine whether the pump(s) are switched.
The following conditions must be fulfilled for consistent level values:
a) The highest adjusted level must be lower than the adjusted measuring range of the level
measuring system
b) Single pump control, alternating dual pump control cut-out level of 1. pump < cut-in level of the 1.
pump < alarm level
c) Dual pump control (peak load operation): cut-out level of 1. pump < cut-out level of 2.pump < cut-
in of 1. pump < cut-in level of 2. pump < alarm level
If during operation, a higher level is measured than the alarm level, then a high water alarm is given.
The following tables show the switching behavior of a dual pump control in peak load operation, a
single pump control and a dual pump control in alternating operation under continuous level
measurement and during operation with float switches respectively.
Level
Alarm level
Cut-in level 1
Cut-out level 1
Level
Alarm level
Cut-in level 2
Cut-in level 1
Cut-out level 2
Cut-out level 1
HSK_operating_manual_English_Ver3.doc
Increasing
Pump 1
I
I
I
I
0
0
0
Increasing
Pump 1
Pump 2
I
I
I
I
I
I
I
I
I
0
I
0
0
0
0
0
0
0
0
0
0
0
Float switch state
I
0
HOMA Pump Technology
Decreasing High water
Pump 1
I
I
I
I
I
0
I
0
I
0
0
0
0
0
Switching behavior of the single pump control
Decreasing
Pump 1
Pump 2
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
0
I
0
0
0
0
0
Switching behavior of the dual pump control
Pump state 1
I
0
Switching behavior in one float switch operation
High water
I
I
0
0
0
0
0
0
0
0
0
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