Wilo Economy Notice De Montage Et De Mise En Service page 39

Fault
Pump(s) not stable and/or make unusual
noises
Motor or pump become too warm
Current consumption too high
Motor protection switch triggers
Installation and operating instructions Wilo-DEA
Cause
Inlet pressure fluctuates sharply
Inlet pipe blocked or shut off
Nominal diameter of inlet pipe too small Check the inlet pipe, increase the cross-
Inlet pipe incorrectly installed
Air in inlet
Air in the pump
Impellers blocked
Volume flow too large
Direction of motor rotation false
Mains voltage: a phase is missing
Pump not adequately secured to base
frame
Bearing damage
Air in inlet
Gate valve in system closed or not suffi-
ciently open
Impellers blocked
Non-return valve blocked
Check valve closed at pressure sensor
Switch-off point set too high
Bearing damage
Turn-to-turn fault in motor
Mains voltage: a phase is missing
Non-return valve leaking
Volume flow too large
Turn-to-turn fault in motor
Mains voltage: a phase is missing
Non-return valve defective
Volume flow too large
Contactor defective
Turn-to-turn fault in motor
Mains voltage: a phase is missing
Remedies
Check inlet pressure, if necessary take
measures to stabilise supply pressure
(e.g. pressure reducer)
Check inlet pipe, if necessary remove
blockage or open check valve
section for the inlet pipe if necessary
Check inlet pipe, if necessary change
pipe guide
Check, if necessary seal pipe. Vent
pumps
Vent pump, check suction line for leaks
and seal if necessary
Check pump, if necessary replace or have
repaired
Check pump data and default values and
correct if necessary
Check direction of rotation and correct
by changing over phases if necessary
Inspect fuses, cables and connections
Check fixation, tighten screws if neces-
sary
Check pump/motor, replace if necessary
or have repaired
Check, if necessary seal pipe. Vent
pumps
Check, open the check valve completely
if necessary
Check pump, if necessary replace or have
repaired
Check, if necessary remove blockage or
replace non-return valve
Inspect, open check valve if necessary
Check setting and correct if necessary
Check pump/motor, replace if necessary
or have repaired
Check, if necessary replace motor or
have repaired
Inspect fuses, cables and connections
Check, if necessary replace seal or
replace non-return valve
Check pump data and default values and
correct if necessary
Check, if necessary replace motor or
have repaired
Inspect fuses, cables and connections
Check, if necessary replace non-return
valve
Check pump data and default values and
correct if necessary
Check and replace if necessary
Check, if necessary replace motor or
have repaired
Inspect fuses, cables and connections
English
33