Pentair Jung Pumpen BASICLOGO EXM Instructions De Service page 14

ENGLISH
observing the pumping process in automatic operation.
The shut-off delay is correct if the pressure sensors have
surfaced completely from the wastewater and the pump is
switched off before it draws air. Seek the help of an expert to
remedy any deviations.
A potentially existing 9V battery pack for a mains-independent
alarm must be checked at regular intervals. For this purpose
de-energise the control unit and trigger the alarm (by trigger-
ing the motor protection switch, for example). The pitch and
volume of the buzzer must not change significantly for several
minutes - otherwise replace the battery pack. Battery packs
which are more than five years old should be replaced as a pre-
cautionary measure.
Regular inspection of the dry running
protection
Dry-running protection is an important safety device for explo-
sion protection, and its good working order must be checked
at least once a year, and in commercially used systems twice
a year:
Turn the pump on by setting the operating mode selector
switch of the control unit to the "Hand" (Manual) position. In du-
plex units, the test must be carried out with both pumps one
after the other.
Observe the water level in the pump chamber.
The device is working correctly ... if the pump switches itself
off before it starts to draw air – without emitting "snoring" nois-
es. When the pump switches itself off, the ring housing (lower
part of the pump with the impeller) must still be completely un-
derwater. "Wassermangel" (Low water level) must be displayed
in the control unit.
Finally, return the operating mode selector switch to the "Au-
tomatic" position.
The device is not working correctly ... if the pump only switch-
es itself off after it has already started to draw air or does
not switch itself off at all. In this case, the cause of the fault
must be searched for and rectified immediately by a specialist
trained in explosion protection!
14