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6�1
Possible Faults
Fault
Possible cause(s)
No power supply
Pump does not
Supply line damaged
start
Impeller blocked
Impeller blocked
Voltage too low
Frequency too high (60 Hz)
Pump overheated
Motor protection
device is trig-
Rated current incorrectly set
gered
after repair
Motor defective
Overload due to excessive
solids content
Impeller worn or damaged
Conveying
capacity
Hose blocked
(quantity/rate)
too low
Inlet screen blocked
Wrong direction of rotation
Bearing failure
Increased
Pebbles/gravel in the inlet
running noises
screen
Operating Instructions for Submersible Pump Series SPT-R
Remedy
Check the power supply and restore it if necessary
Check the supply line and replace it if necessary
Check the impeller and remove blockage or clogging if
nec-essary
Check the impeller and remove blockage or clogging if
nec-essary
Check voltage supply and establish nominal voltage
Check mains frequency and establish nominal frequency. If
required, change the model
Check whether the pump delivers sufficient liquid, clean inlet
screen if necessary
Have the adjustment of the motor protection module che-
cked and adjusted by a specialist
Check the stator and replace it if necessary
Dilute medium (max. 20 % solids content)
Clean inlet screen
If the intake contains too much sediment, place the pump on
a raised concrete block
Replace impeller
Remove blockage. Lay hose straight and without kinks
Clean inlet screen, avoid sediment transport
Check rotating field and, if necessary, establish clockwise
ro-tating field using phase inverter or check connection
Replace the ball bearing
Clean inlet screen
Troubleshooting
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