instrucţiune de funcţionare (2.0 MB)

english14. Summary of faults Before removing the terminal box coverand before any dismantling of the pump, itis imperative to switch the supply voltageoff completely.FaultCause1. Motor does not start up a) No supply of current to the motorb) Fuses blownc) Motor protection switch triggeredd) Switching contacts or the coil of the switchingdevice are defectivee) Control fuse defectivef) Motor defective2. Motor protection switch triggers immediately a) A fuse is blownwhen switched onb) Motor protection switch contacts defectivec) Cable link loose or defectived) Motor winding defectivee) Pump blocked mechanicallyf) Motor protection switch set too lowor has wrong range3. Motor protection switch triggers sometimes a) Motor protection switch set too lowb) Mains voltage to the pump is too low or too highc) Differential pressure across the pump is too lowor motor is overloaded4. Motor protection switch has not triggered a) Check items 1a), b), d), e) and f)but pump does not run5. Pump output unstable a) Suction line too narrow or bent inlet(e.g. curve at suction intake)b) Suction line/pump dirtyc) Pump sucks in air6. Pump runs but does not pump water a) Suction line/pump blocked by impuritiesb) Base or nonreturn valve blocked in closed positionc) Suction line leakingd) Air in the suction line or in the pumpe) Motor running in wrong direction of rotation7. Pump rotates in the reverse direction a) Suction line leakingafter being switched offb) Base or nonreturn valve defectivec) Base or nonreturn valve blocked in the openor partially open position8. Leakage in the shaft seal a) Wrong fitting of the shaft sealb) Shaft seal defectivec) Abrasive additivesd) Air in the mechanical shaft seal space/air in the system pressure9. Noises a) Cavitation in the pumpb) Frequency converter operation:– See Section 8.– Resonance in the systemc) Foreign body in the pump/ impellerd) Insufficiently vented25