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A
B
C
D
G
H
Table 9: Trouble-shooting
A
B
C
D E
F
G
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✘
✘
✘
✘
✘
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✘
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✘
✘
✘
✘
✘
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✘
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✘
✘
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✘
✘
Pump set pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
8)
34 of 42
8 Trouble-shooting
8 Trouble-shooting
Pump is running but does not deliver
Pump delivers insufficient flow rate
Insufficient discharge head
Vibrations and noise during pump operation
E
Unit tripped by overcurrent relay
F
Fuses have blown
Pump set cannot be started up
Pump set cannot be switched off
H
Cause
Pump delivers against an excessively
high discharge pressure.
Pump delivers against an excessively
low discharge pressure.
Deposits in the impellers
Wrong direction of rotation (in case of
3 ~)
Wear of internal components
Motor is running on two phases only.
No power supply
Pump clogged by sand
Motor winding or electric cable are
defective.
Defective or clogged riser (pipe and
sealing elements).
Water level lowered too much during
operation.
Impermissible air or gas content in the
fluid handled
Mechanical defect on pump or motor
System-induced vibrations
NPSH available (positive suction head)
is too low.
Speed is too low.
Wrong fuse size
✘ Defective overcurrent relay
Motor winding not suitable for
operating voltage available
S 100D; UPA 100C
Remedy
8)
Open the shut-off valve to re-adjust to
duty point.
Close the shut-off valve to re-adjust to
duty point.
Remove deposits.
Contact KSB.
Interchange two of the phases of the
power supply cable.
Replace worn parts by new ones.
Contact KSB.
Replace defective fuse.
Check cable connections.
Check electrical installation,
contact electric utility company.
Clean suction casing, impellers, stage
casings and check valve.
Contact KSB.
Contact KSB.
Replace affected pipes.
Replace sealing elements.
Contact KSB.
Contact KSB.
Contact KSB.
Contact KSB.
Submerge pump deeper.
Check voltage and increase, if necessary.
Contact KSB.
Fit correct fuse size.
Check and replace, if necessary.
Replace the pump set.
Contact KSB.
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