BADU Normblock Multi Originalbetriebsanleitung Seite 90

Faults
Fault: Too low a flow rate in the pump
Possible cause
Pump is handling against
too high a discharge
head.
Pump and pipes not
completely ventilated or
filled.
Pump/pump parts
blocked due to
impurities.
Building up of air sacks
in the piping.
Suction height too
large/Unit's NPSH
(intake) too low.
Drawing in air in the
mechanical seal.
Incorrect direction of
rotation (3~).
Too low a speed.
Wear of components.
Running on two phases.
30 EN
Solution
 Set operating point again.
 Check unit for impurities.
 Ventilate pump.
 Fill pump.
 Clean.
 Modify piping or insert a
ventilation valve.
 Correct the fluid level.
 Install pump lower.
 Completely open shut-off valve
in the intake line.
 If the resistance is too large,
modify the intake line.
 Check suction basket/suction
opening.
 Observe the permitted pressure
reduction speed.
Replace mechanical seal.

 Check the electrical connection
to the motor and switching
device.
 Increase the voltage/frequency
on the frequency converter
within the permitted range.
 Replace components.
 Renew faulty fuse.
Check the electrical connections

using the operating manual.
04/2019