Standstill Detection For Water Pump - HAKO Hakomatic B 1100 Service Booklet

8.2 Standstill Detection For
Water Pump
Automatic standstill detection for water pump:
The electronics offer a possibility for water pump protection if delivery of pump is
blocked.
When the pump takes in water from the tank but cannot deliver it to the brushes,
a pressure builds up downstream the pump. Without protection by the electronics,
the pump would continue delivery against this pressure and could be damaged.
The electronics detects interruption of free delivery of the pump and automatically
switches off the pump for 2 seconds.
After these 2 seconds, pump is briefly switched on with simultaneous measurement
whether delivery then is free or whether water supply to brushes is still blocked.
When delivery of the pump is free, the selected stage remains ON; if counter-pressure
is still present, the pump again is switched OFF for 2 seconds. This procedure is
repeated until fault will be remedied.
Foil 54