Grundfos AMG Montage- Und Betriebsanleitung Seite 32

Fault Cause
Propeller blades are dirty or damaged.
Internal parts are worn.
Propeller blades are dirty or damaged.
Mixer or flowmaker
runs unevenly and is
noisy.
Damaged motor or gearbox roller bearings. Contact Grundfos.
Oscillations caused by the installation (res-
onance).
Wrong voltage supply or supply failure.
Power supply cable is damaged.
Control system is damaged.
Propeller cannot rotate freely.
High current and
power consumption.
Stator windings are damaged.
Mixer or flowmaker runs on two phases.
Internal parts are worn.
Damaged motor or gearbox roller bearings. Contact Grundfos.
32
Remedy
Clean the blades and inspect them for any
wear. In case the propeller blades are worn
or damaged, contact Grundfos.
Contact Grundfos.
Clean the blades and inspect them for any
wear. In case the propeller blades are worn
or damaged, contact Grundfos.
Check the installation design.
• Re-establish the correct voltage supply.
• Contact an authorised service work-
shop.
Contact an authorised service workshop.
Contact an authorised service workshop.
Clean the propeller blades and make sure
that the propeller can rotate freely.
Contact Grundfos.
• Check the electrical connections.
• Replace damaged fuses.
• Call an electrician.
Contact Grundfos.