8
Trouble-shooting
Pump is running but does not deliver
Pump delivers insufficient flow rate
Motor is overloaded
Excessive current consumption
Excessive power consumption
Leakage at the pump
Vibrations during pump operation
Impermissible rise of temperature inside the pump
Rubbing noises
A B C D E F G H I
Possible cause
Remedy
15)
X
Pump delivers against an excessively high
discharge pressure.
Open the shut-off elements further to re-
adjust to duty point.
X
Excessive back pressure
Check system for impurities. Fit larger
impeller.
16)
X
X X
Pump or piping are not completely
vented or primed.
Vent and/or prime.
X
Supply line or impeller clogged.
Remove deposits in the pump and/or
piping.
X
Formation of air pockets in the piping
Alter piping layout, fit vent valve.
X
X X
NPSH
available
(positive suction head) is too
low
Check/alter fluid 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.
X
Suction lift is too high.
Clean suction strainer and suction lines.
Correct/alter liquid level.
Change suction line.
X X
Wrong direction of rotation
Interchange two of the phases of the
power cable.
X
Speed is too low
15) 16)
- Operation with frequency inverter
- Operation without frequency inverter
- Increase voltage/frequency at the FI in
the permissible range.
- Check voltage.
X X X X
X
Wear of internal parts
Replace worn parts by new ones.
X
Pump back pressure is lower than
specified in purchase order.
Adjust duty point accurately.
In the case of persistent overloading, turn
down impeller.
16)
X
Density or viscosity of the fluid handled is
higher than stated in the purchase order.
16)
X X
Supply voltage is too low.
Increase voltage; check voltage drop in
the power cable.
X X X X
Motor is running on two phases only.
Replace the defective fuse.
Check the electric cable connections.
X
Connection bolts have worked loose.
Re-tighten bolts.
Fit new sealing elements.
X
Rotor is out of balance.
Clean impeller.
Re-balance the impeller.
X X
X
X Defective bearing(s)
Fit new bearing(s).
A
B
C
D
E
F
G
H
I
15)
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
16)
Contact KSB.
8 Trouble-shooting
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Etaseco/Etaseco I
Содержание Etaseco C
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