Wilo FLA-Serie Einbau- Und Betriebsanleitung Seite 52

English
Fault
Switching frequency too high or flutter-
ing
Pump not stable and/or making unusual
noises
Pump not stable and/or making unusual
noises
Motor or pump become too warm
Current consumption too high
42
Cause
Intake pipe blocked or shut off
Nominal diameter of the inlet pipe too
small
Inlet pipe installed incorrectly
Check valve closed at pressure sensor
Incorrect supply pressure at diaphragm
pressure vessel
Valve at diaphragm pressure vessel
closed
Switching difference set too low
Intake pipe blocked or shut off
Nominal diameter of the inlet pipe too
small
Inlet pipe installed incorrectly
Air in the inlet
Air in the pump
Impellers blocked
Flow rate too high
Incorrect direction of rotation of the
motors
Mains voltage: a phase is missing
Pump not adequately secured to base
frame
Bearing damage
Air in the inlet
Bypass line closed or not sufficiently
open
Impellers blocked
Bearing damage
Turn-to-turn fault in the motor
Mains voltage: a phase is missing
Flow rate too high
Turn-to-turn fault in the motor
Mains voltage: a phase is missing
Remedies
Check the inlet pipe and remove the
blockage or open the check valve if
necessary.
Check the inlet pipe and increase the
cross-section of the inlet pipe if neces-
sary.
Check the inlet pipe and change the
pipe routing if necessary.
Check and open the check valve if nec-
essary.
Check the supply pressure and correct it
if necessary.
Check the valve and open it if necessary.
Check the setting and correct it if nec-
essary.
Check the inlet pipe and remove the
blockage or open the check valve if
necessary.
Check the inlet pipe and increase the
cross-section of the inlet pipe if neces-
sary.
Check the inlet pipe and change the
pipe routing if necessary.
Check and shut off the piping and vent
the pumps if necessary.
Vent the pump, check the suction line
for leakages and seal it if necessary.
Check the pump and replace it or have it
repaired if necessary.
Check the pump data and default values
and correct them if necessary.
Check direction of rotation and correct
by changing over phases if necessary
Check the fuses, cables and connec-
tions.
Check the fixation and re-tighten the
fastening screws if necessary.
Check the pump/motor and replace it or
have it repaired if necessary.
Check and shut off the piping and vent
the pumps if necessary.
Check, adjust needle-type throttle if
necessary.
Check the pump and replace it or have it
repaired if necessary.
Check the pump/motor and replace it or
have it repaired if necessary.
Check, if necessary replace motor or
have repaired.
Check the fuses, cables and connec-
tions.
Check the pump data and default values
and correct them if necessary.
Check, if necessary replace motor or
have repaired.
Check the fuses, cables and connec-
tions.
WILO SE 08/2019