A B C D E F G H I J K L M Possible causes
Remedy
22)
✘ - - ✘ ✘ - - - - - - ✘ - Motor is running on 2 phases only. ▪ Replace defective fuses.
▪ Check electrical connections.
▪ Check switchgear.
- - - - - - - ✘ - ✘ ✘ - - Rotor out of balance ▪ Clean the rotor.
▪ Check run-out; re-align, if
necessary.
▪ Re-balance the rotor.
- - - - - - - ✘ - ✘ ✘ - - Defective bearing(s) ▪ Replace.
- - - - - - - ✘ ✘ - - - - Flow rate is too low. ▪ Re-adjust to duty point.
▪ Fully open shut-off element in
suction/inlet line.
▪ Fully open shut-off element in
discharge line.
▪ Re-calculate or measure
hydraulic losses H
V
.
✘ - - ✘ - - - - - - - - - In star-delta operation, motor
stuck at star stage
▪ Check electrical connections.
▪ Check switchgear.
✘ - - ✘ - - - ✘ - - - - - Impermissible air or gas content in
fluid handled
▪ Vent.
▪ Check suction line for leakage,
seal if necessary.
✘ - - ✘ - ✘ ✘ ✘ - - - - - Air intake at pump inlet ▪ Correct suction conditions.
▪ Reduce flow velocity at suction
line inlet.
▪ Increase suction head.
▪ Check suction line for leakage,
seal if necessary.
▪ Replace defective pipes.
- - - - - - - ✘ - - - - - Cavitation (rattling noise) ▪ Correct suction conditions.
▪ Check operating mode.
▪ Increase suction head.
▪ Install pump at a lower level.
- - - - - - - ✘ - ✘ - - - Foundation not rigid enough ▪ Check.
▪ Adjust.
✘ - - ✘ - ✘ ✘ ✘ - - - - - Impermissible parallel operation ▪ Re-adjust to duty point.
▪ Adjust pump characteristic H.
- - - - - - - ✘ - - ✘ - - Shaft is out of true. ▪ Replace.
- - - - ✘ - - ✘ ✘ ✘ - - - Impeller rubs against casing
components.
▪ Check rotor.
▪ Check impeller position.
▪ Verify that piping has been
connected without
transmitting any stresses or
strains.
22)
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
8 Trouble-shooting
72 of 94
Omega / Omega V
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