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float 1
Float switch 1
0
1
1
1
All other states: sensor fault
Float switch1
0
1
1
All other states: (sensor faults)
Principally, following applies: When a cut-out signal is generated by either a change in level or by a
change in the float switch state, the pump does not switch off immediately, but only after the set run-
on time elapses.
8
Special functions
8.1
AUX inputs
Independently of the control, each pump can be switched off by an AUX input. In normal operation, the
input must be bridged. If the input is open, then the corresponding pump is stopped and an AUX1 fault
is recognized.
The function is independent of the control electronics and it affects the control circuit of
the pump directly. This function can be used in order to switch off the pump by means of a coupling
relay independently from the control or release the pump respectively.
8.2
External Off
Should the control not be operated with float switches, the controller has the possibility to stop the
control unit using the input SW1. Both pumps switch off, when the input is closed. When the input is
12
The operation with three float switches and one pump does not represent a sensible mode of
operation.
Float switch state
0
I
I
All other states: sensor fault
Switching behavior in a two float switch operation with two pumps
Float switch state
Float switch 2 Float switch 3 pump1
0
0
1
1
Switching behavior in case of three float switch operation with two pumps
Float switch state
Float switch 2 Float switch 3 Pump1
0
0
1
HOMA Pump Technology
Float 2
Pump 1
0
0
I
0
I -> 0
0
Unchanged
0
0-> I
1
1
0
Arbitrary
Arbitrary
Arbitrary
Two and three float switch operation with one pump
Pump state
Pump 2
0
0
I
0
I
0
0
0
Pump state
pump 2
0
I -> 0
Unchanged
0 -> I
0
State
I -> 0
Unchanged
0-> I
0
HSK_operating_manual_English_Ver3.doc
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