8 Trouble-shooting
58 of 82
Amarex
2573.820/02-EN
8 Trouble-shooting
WARNING
Improper work to remedy faults
Risk of injury!
▷ For any work performed to remedy faults, observe the relevant information
given in this operating manual and/or in the product literature provided by the
accessories manufacturer.
If problems occur that are not described in the following table, consultation with the
KSB service is required.
A Pump is running, but does not deliver
B Pump delivers insufficient flow rate
C Excessive current/power input
D Insufficient discharge head
E Vibrations and noise during pump operation
Table29: Trouble-shooting
A B C D E Possible cause Remedy
- ✘ - - - Pump delivers against an excessively high
pressure.
Re-adjust to duty point.
- ✘ - - - Gate valve in the discharge line is not fully
open.
Fully open the gate valve.
- - ✘ - ✘ Pump running in off-design conditions (part
load/ overload)
Check the pump's operating data.
✘ - - - - Pump and/or piping not completely vented Vent by lifting the pump off the duckfoot bend
and lowering it again.
✘ - - - - Pump intake clogged by deposits Clean the intake, pump components and lift
check valve.
- ✘ - ✘ ✘ Inlet line or impeller clogged Remove deposits in the pump and/or piping.
- - ✘ - ✘ Dirt/fibres in the clearance between the casing
wall and impeller; sluggish pump rotor.
Check whether the impeller can be easily
rotated.
Clean the impeller if required.
- ✘ ✘ ✘ ✘ Wear of internal parts Replace worn parts by new ones.
✘ ✘ - ✘ - Defective riser (pipe and sealing element) Replace defective riser pipes,
replace sealing elements.
- ✘ - ✘ ✘ Impermissible air or gas content in the fluid
handled
Contact the manufacturer.
- - - - ✘ System-induced vibrations Contact the manufacturer.
- ✘ ✘ ✘ ✘ Wrong direction of rotation Check the electrical connection of motor and
control system (if any).
- - ✘ - - Wrong supply voltage Check the power cable.
Check the cable connections.
Check the voltage in the control cabinet.
✘ - - - - Motor is not running because of lack of voltage. Check the electrical installation.
Contact the energy supplier.
✘ - ✘ - - Motor winding or power cable are defective. Replace by new original KSB parts or contact the
manufacturer.
- - - - ✘ Defective rolling element bearing Contact the manufacturer.
- ✘ - - - Water level lowered too much during operation Check level control equipment.
✘ - - - - Temperature control device monitoring the
winding has tripped the pump as a result of
excessive winding temperatures.
The motor will restart automatically once it has
cooled down (version US).
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