8 Trouble-shooting
45 of 52
Etaline-R
8 Trouble-shooting
WARNING
Improper remedial work on the pump (set)
Risk of injury!
▷
For any work performed in order to remedy faults on the pump (set) observe
the relevant information given in this operating manual or the product
literature provided by the accessories manufacturers.
If problems occur that are not described in the following table, consultation with
KSB’s customer service is required.
A
Pump delivers insufficient flow rate
B
Motor is overloaded
C
Motor protection switch / thermistor trip device trips the unit
D
Increased bearing temperature
E
Leakage at the pump
F
Excessive leakage at the shaft seal
G
Vibrations during pump operation
H
Impermissible rise of temperature inside the pump
Table 19:
Trouble-shooting
A B C D E F G H Possible cause
Remedy
10)
✘
Pump delivers against an excessively
high pressure.
Re-adjust to duty point.
Check system for impurities.
Fit a larger impeller.
10)
Increase the speed (frequency inverter).
✘
✘ ✘
Pump and/or piping are not completely
vented or primed.
Vent and/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 liquid level (open system).
Increase system pressure (closed system).
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.
✘
Air intake at the shaft seal.
Clean barrier fluid duct or increase barrier
fluid pressure.
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.
- 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.
Adjust duty point accurately.
In the case of persistent overloading, turn
down impeller.
10)
10)
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
