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Wilo -Atmos BST Instrucciones De Instalación Y Funcionamiento página 52

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52
Faults
Causes
Impeller damaged and
corroded
Insufficient volume
Seal ring damaged and
flow
corroded
Motor speed is lower than
required
Incorrect direction of ro-
tation
Min. inlet pressure too low
Delivery head losses
or negative suction head
too high
Impeller damaged and
corroded
Volume flow is outside
the permissible field of
application
Voltage higher than rated
Motor overheating
voltage
Voltage too low, fan
works too slowly
Motor fan damaged
Housing screws not
Leakage at the pump
tightened
Noise, bearings become
Motor bearings damaged
hot
The pump is strained
Volume flow rate is out-
side the permissible field
Pump makes noises
of application and causes
the delivery head loss
Power supply failure
Fuses have tripped or
blown
Motor protection switch
Pump does not start
has been triggered
Thermal protection has
tripped out
Motor is malfunctioning
A fuse/circuit breaker has
tripped or blown
Motor overload trips
Cable connection is loose
out immediately when
or faulty
power supply is activ-
Motor winding is defect-
ated
ive
Pump mechanically
clogged
Overload setting is too
Motor overload trips
low
out occasionally
Low voltage at peak times
Pump inlet pressure is too
low (cavitation)
Pump capacity not
Suction pipe/pump partly
constant
clogged by impurities
Pump draws in air
Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
Remedy
Replace impeller
Replace gasket
Check voltage
Change motor wiring (3 phase
motor: swap phases)
Correct liquid level, reduce
resistances in the suction line
Replace impeller
Adhere to recommended
minimum volume flow
Check voltage
Check voltage
Check motor fan
Tighten the housing screws
Have bearings replaced
Correct the pump installation
Adhere to recommended
minimum volume flow
Check power supply
Replace fuses
Reactivate the motor protec-
tion
Reactivate the thermal pro-
tection
Replace motor (contact ser-
vice)
Cut in the fuse
Fasten or replace the cable
connection
Replace motor (contact ser-
vice)
Remove clogging
Set motor protection switch
correctly
Check power supply
Check the suction conditions
Clean pump and supply line
Check the suction conditions

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