Fault description Cause Remedy Personnel
Incorrect parameteriza-
tion of the control unit or
frequency converter
— Correct the setting
—
Check that the frequency con-
verter is suitable (it must emit a
constant torque)
Qualified
electricians
Pressure line (side of
outlet) is closed or
blocked
— Open shut-off device
—
Clean the pressure line
Mechanics
Long-fibrous or film-like
particles have become
wrapped around the
rotors
— Remove all foreign bodies
—
Install a macerator (Multi-
crusher, Multichopper) and a
stone trap upstream, if neces-
sary
Mechanics
Sediment of the
pumped medium has
been deposited in the
pump chamber fol-
lowing a lengthy down-
time of the rotary lobe
pump
— Clean the pump chamber
—
Close the valve of the inlet line
and clean the pump chamber
before longer downtimes
Mechanics
Polymer rotors have
expanded and press too
strongly against the
casing wall
— Determine the chemical compo-
sition and temperature of the
pumped medium and use rotors
made from suitable materials
(test plates for testing the
expansion are available from
Börger GmbH)
Mechanics
Drive output too low — Install a more powerful drive Mechanics
The pump does not
generate suction
Incorrect drive direction
of rotation, therefore
incorrect flow direction
— Change the direction of drive
rotation
Mechanics
Suction line (side of
inlet) closed or blocked
— Open shut-off device
—
Clean the suction line
Mechanics
Suction connection is
leaky
— Tighten the screws on the
flange connection cross-wise
with uniform strength
—
Check the seal and replace, if
necessary
Mechanics
Operation
BA-Classic FL_en-US, 03.05.2018 www.boerger.de / www.boerger.com 97
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