8 Trouble-shooting
Pump is running but does not deliver
Pump delivers insufficient flow rate
Insufficient discharge head
Vibrations and noise during pump operation
Unit tripped by overcurrent relay
Fuses have blown
Pump set cannot be started up
Pump set cannot be switched off
Table 21: Trouble-shooting
A B C D E F G H Cause
Remedy
17)
✘
Pump delivers against an excessively
high discharge pressure.
Open the shut-off valve to re-adjust to
duty point.
✘
Pump delivers against an excessively
low discharge pressure.
Close the shut-off valve to re-adjust to
duty point.
✘ ✘
Deposits in the impellers Remove deposits.
Contact KSB.
✘ ✘
Wrong direction of rotation (in case of
3 ~)
Interchange two of the phases of the
power supply cable.
✘ ✘
Wear of internal components Replace worn parts by new ones.
Contact KSB.
✘
✘
Motor is running on two phases only. Replace defective fuse.
Check cable connections.
✘
✘
No power supply Check electrical installation,
contact electric utility company.
✘
✘
Pump clogged by sand Clean suction casing, impellers, stage
casings and check valve.
Contact KSB.
✘
✘ ✘ ✘
Motor winding or electric cable are
defective.
Contact KSB.
✘ ✘ ✘
Defective or clogged riser (pipe and
sealing elements).
Replace affected pipes.
Replace sealing elements.
✘
Water level lowered too much during
operation.
Contact KSB.
✘
✘ ✘
Impermissible air or gas content in the
fluid handled
Contact KSB.
✘
Mechanical defect on pump or motor Contact KSB.
✘
System-induced vibrations Contact KSB.
✘
✘
NPSH available (positive suction head)
is too low.
Submerge pump deeper.
✘ ✘
Speed is too low. Check voltage and increase, if necessary.
Contact KSB.
✘
Wrong fuse size Fit correct fuse size.
✘
✘ ✘ Defective overcurrent relay Check and replace, if necessary.
✘
Motor winding not suitable for
operating voltage available
Replace the pump set.
Contact KSB.
A
B
C
D
E
F
G
H
17)
Pump set pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
8 Trouble-shooting
UPA, UPZ, BSX
53 of 64
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