Trouble-Shooting - KSB Etanorm FXV Installation & Operating Manual

Table 19: Trouble-shooting
A B C D E F G H Possible cause
✘ - - - - - - - Pump delivers against an excessively
✘ - - - - - ✘ ✘ Pump or piping are not completely
✘ - - - - - - - Supply line or impeller clogged
✘ - - - - - - - Formation of air pockets in the piping
✘ - - - - - ✘ ✘ Suction lift is too high/NPSHavailable
✘ - - - - - - - Air intake at the shaft seal
- - - - - - - Wrong direction of rotation
✘
✘ - - - - - - - Speed is too low.
✘ - - - - - ✘ - Wear of internal components
- - - - - - Pump back pressure is lower than
✘ ✘
9
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
10 Contact the manufacturer.

8 Trouble-shooting

8 Trouble-shooting
WARNING
Improper work to remedy faults
Risk of injury!
▷ For any work performed to remedy faults, observe the relevant information
given in this operating manual and/or in the product literature provided by the
accessories manufacturer.
If problems occur that are not described in the following table, consultation with the
KSB service is required.
A Pump delivers insufficient flow rate
B Motor is overloaded
C Excessive discharge pressure
D Increased bearing temperature
E Leakage at the pump
F Excessive leakage at the shaft seal
G Vibrations during pump operation
H Impermissible temperature increase in the pump
high pressure.
vented or primed.
(positive suction head) is too low.
- Operation with frequency inverter
- Operation without frequency inverter
specified in the purchase order.
Etanorm FXV
9)
Remedy
Re-adjust to duty point.
Check system for impurities.
10)
Fit a larger impeller.
Increase the speed (turbine, I.C. engine).
Vent and/or prime.
Remove deposits in the pump and/or piping.
Alter piping layout.
Fit vent valve.
Check/alter fluid level.
Install pump at a lower level.
Fully open the shut-off element in the suction
line.
Change suction line, if the friction losses in
the suction line are too high.
Check any strainers installed/suction opening.
Observe permissible speed of pressure fall.
Supply external barrier fluid, if necessary, or
increase barrier fluid pressure.
Replace shaft seal.
Check the electrical connection of the motor
and the control system, if any.
- Increase voltage/frequency at the frequency
inverter in the permissible range.
- Check voltage.
Replace worn components by new ones.
Re-adjust to duty point.
In the case of persistent overloading, turn
10)
down impeller.
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