KSB EtaLine Pro, Installation And Operating Manual

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9 Trouble-shooting
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EtaLine Pro
1168.87/01-EN
9 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 Tripping due to excessive motor temperature
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
I Pump set does not start up.
Table 35: Trouble-shooting
A B C D E F G H I Possible cause Remedy
6)
✘
- - - - - - - - Pump delivers against an excessively high
pressure.
▪
Re-adjust to duty point.
▪ Check system for impurities.
▪ Fit larger impeller.
6)
Increase the speed
(frequency inverter).
✘ - - - - - ✘ ✘ - Pump and/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 a vent valve.
✘
- - - - -
✘ ✘
- Suction lift is too high/NPSH
Anlage
(positive
suction head) is too low.
▪
Check/alter liquid level (open system).
▪ Increase system pressure (closed
system).
▪ Install pump set at a lower level.
▪ Fully open the shut-off element in the
inlet line.
▪ Change suction/inlet line, if the
friction losses in the suction/inlet line
are too high.
Check any strainers installed/suction
opening.
Observe permissible speed of pressure
fall.
✘ - - - - - - - - Speed too low (operation on a frequency
inverter)
Increase voltage/frequency at the
frequency inverter in the permissible
range.
✘
- - - - -
✘
- - Wear of internal components Replace worn parts by new ones.
6 Release pump pressure before attempting to remedy faults on parts which are subjected to pressure.