KSB Etachrom L, Installation & Operating Manual

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8 Trouble-shooting
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Etachrom L
1212.8/19-EN
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
Table 22: Trouble-shooting
A B C D E F G H Possible cause Remedy
13)
✘ - - - - - - - Pump delivers against an excessively
high pressure.
Re-adjust to duty point.
Check system for impurities.
Fit a larger impeller.
14)
Increase the speed (turbine, I.C. engine).
✘ - - - - - ✘ ✘ Pump or piping are not completely
vented or primed. Vent or prime.
✘ - - - - - - - Supply line or impeller clogged Remove deposits in the pump and/or piping.
✘ - - - - - - - Formation of air pockets in the piping Alter piping layout.
Fit vent valve.
✘ - - - - - ✘ ✘ Suction lift is too high/NPSH
available
(positive suction head) is too low.
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 loss in the
suction line is too high.
Check any strainers installed/suction opening.
Observe permissible speed of pressure fall.
✘
- - - - - - - Air intake at the shaft seal Fit new shaft seal.
✘
- - - - - - - Wrong direction of rotation Check the electrical connection of the motor
and the control system, if any.
✘ - - - - - - - Speed is too low.
14)
- Operation with frequency inverter
- Operation without frequency inverter
- Increase voltage/frequency at the frequency
inverter in the permissible range.
- Check voltage.
✘ - - - - - ✘ - Wear of internal components Replace worn components by new ones.
- ✘ - - - - ✘ - Pump back pressure is lower than
specified in the purchase order.
Re-adjust to duty point.
In the case of persistent overloading, turn
down impeller.
14)
-
✘
- - - - - - Density or viscosity of fluid handled
higher than stated in purchase order
Contact KSB.
13 Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
14 Contact KSB.