8 Trouble-shooting
51 of 64
KWP-Bloc
A B C D E F G H Possible cause Remedy
17)
✘ - - - - - - - Speed too low
- Operation with frequency inverter
- Operation without frequency inverter
- Increase voltage/frequency at the frequency
inverter in the permissible range.
- Check voltage.
- - - ✘ - ✘ ✘ - Defective bearing(s) Replace.
- - - ✘ - - ✘ ✘ Flow rate is too low. Increase the minimum flow rate.
✘ - - - - - ✘ - Wear of internal components Replace worn components by new ones.
- - - - - - ✘ - Pump back pressure lower than specified
in the purchase order
Re-adjust to duty point.
- ✘ - - - - - - Density or viscosity of fluid handled
higher than stated in purchase order
Contact the manufacturer.
- - - - - ✘ - - Use of unsuitable materials Change the material combination.
- ✘ ✘ - - - - - Speed too high Reduce speed.
18)
- - - - ✘ - - - Tie bolts/sealing element defective Fit new sealing element between volute
casing and discharge cover.
Re-tighten the bolts.
- - - - - ✘ - - Worn shaft seal Fit new shaft seal.
✘ - - - - ✘ - - Score marks or roughness on shaft
protecting sleeve / shaft sleeve
Replace shaft protecting sleeve/shaft sleeve.
Replace shaft seal.
Check balancing line.
Check throttling bush/throttling sleeve
clearances.
- - - - - ✘ - - Lack of cooling liquid or dirty cooling
chamber
Increase cooling liquid quantity.
Clean out cooling chamber.
Purify/clean cooling liquid.
- ✘ - - - - ✘ - Pump back pressure lower than specified
in the purchase order
Re-adjust to duty point.
- - - - - ✘ - - Vibrations during pump operation Correct the suction conditions.
Re-align the pump set.
Re-balance the impeller.
Increase pressure at the pump suction nozzle.
- - - ✘ - ✘ ✘ - The pump set is misaligned. Re-align the pump set.
- - - ✘ - - - - Insufficient or excessive quantity of
lubricant or unsuitable lubricant.
Top up, reduce or change lubricant.
- ✘ - - - - - - Operating voltage too low Increase the voltage.
Check voltage drop in the power cable.
- - - - - - ✘ - Rotor out of balance Clean rotor.
Re-balance rotor.
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