HAKO Scrubmaster B175 R, Manual

Page: 82 / 124

8. Water pump
8.2 Water pump standstill detection
Sheet 82
If the pump cannot delivery freely because the water cannot run freely
through the hoses to the brush, so-called water pump standstill detection
comes into effect.
Automatic water pump standstill detection:
The electronics offers the option to protect the water pump if the pump can no longer
convey freely.
This means: If the pump sucks water from the tank but cannot further convey
the water to the brushes, pressure builds up behind the pump.
Without protection from the electronics, the pump will now continue to pump against
this pressure and may be damaged.
The electronics detects that the pump cannot convey freely and automatically
switches the pump OFF for 2 seconds.
After these 2 seconds have expired, the pump is briefly switched back on while
simultaneously measuring whether the pump can now convey freely again or whether
the water supply to the brushes is still blocked.
If the pump can convey freely, it remains switched on in the selected stage.
If there is, however, still counter pressure, the pump is switched off again for 2 seconds.
This is repeated until the error has been eliminated.