8 Trouble-shooting
Pump is running but does not deliver
Pump delivers insufficient flow rate
Excessive current/power consumption
Insufficient discharge head
Vibrations and noise during pump operation
Table 20: Trouble-shooting
A B C D E Possible cause
Remedy
Release the pump pressure before
attempting to remedy faults on pressure-
retaining parts. Disconnect the pump set
from the power supply!
✘
✘
Water level lowered too much during
operation
Check supply and capacity of system (sump
floor area).
Check level control equipment.
✘ ✘
✘
Total pressure corresponding to NPSH
pump
too
high
Total pressure corresponding to NPSH
system
too
low
Increase fluid level on the suction side.
Clean screening equipment, if required.
✘ ✘ ✘
✘
Penetration of air into the pump due to
formation of an air pocket
- Suction-side water level too low
Increase the suction-side water level. If this is
not possible or unsuccessful, please contact
KSB.
✘ ✘ ✘
✘
Unfavorable flow to the pump inlet
Improve the flow to the intake chamber
(contact KSB).
✘ ✘
✘
Pump running in off-design conditions
- low flow/overload
Check the pump's operating data.
✘ ✘
✘ ✘
Pump clogged by deposits
Clean intake and pump components.
✘ ✘ ✘ ✘
Wear
Replace worn parts by new ones.
✘
✘ ✘
Impermissible air or gas content in the fluid
handled
Contact KSB.
✘
System-induced vibrations
Contact KSB.
✘
✘
Wrong direction of rotation
Check the connection of the motor and
control system, if any.
✘
No voltage
Check the electrical installation.
Contact the energy supplier.
✘
Motor winding or electrical cable defective
Replace with original KSB cable or contact
KSB.
✘
✘
Worn or defective rolling element bearings
Contact KSB.
✘
The thermistor tripping unit with manual
reset for temperature limiter has tripped the
pump as a result of the permissible winding
temperature being exceeded.
Have cause determined and eliminated by
qualified and trained personnel.
✘
Motor has been tripped by leakage monitor.
Have cause determined and eliminated by
qualified and trained personnel.
✘
Mechanical seal monitor has tripped.
Have cause determined and eliminated by
qualified and trained personnel.
✘
Bearing temperature monitor has tripped.
Have cause determined and eliminated by
qualified and trained personnel.
A
B
C
D
E
8 Trouble-shooting
54 of 68
Amacan P
