Amarex
N
26
8
Trouble-shooting
Fault / malfunction
Cause
Remedy
Pump does not deliver
Motor is not running because of lack of voltage. Check the electrical installation.
p
Motor is running on two phases only.
Replace the defective fuse. Check the electric
cable connections.
Motor winding or electric cable are defective.
Replace stator and/or electric cable by original
spare parts.
The temperature switch monitoring the winding
has tripped the pump because of excessive
temperature rise in the winding.
The motor will restart automatically once the
unit has cooled down.
Tripping unit with manual reset for temperature
limiter (explosion protection, YL model) has
tripped the pump as a result of the permissible
winding temperature being exceeded.
Pump needs to be inspected.
Moisture sensor has tripped the pump due to
moisture in the motor.
Pump needs to be inspected.
Gate valve in discharge pipe closed or blocked,
swing check valve blocked.
Check gate valve, open and/or clean, if necess-
ary. Clean the swing check valve.
Pump intake clogged by deposits.
Clean the intake, pump components and check
valve.
Pump or piping are not completely vented.
Vent by lifting the pump off the duckfoot bend
and lowering it again.
Pump delivers insufficient
flow rate
Wrong direction of rotation.
Interchange two of the phases of the power sup-
ply cable.
Motor is running on two phases only.
Replace the defective fuse. Check the electric
cable connections.
Gate valve in the discharge line is not fully open. Fully open the gate valve.
Clogged impeller
Remove deposits in the pump.
Wear of internal pump parts.
Replace worn components by new ones.
Gate valve in discharge pipe closed or blocked,
swing check valve blocked.
Check gate valve, open and/or clean, if necess-
ary. Clean the swing check valve.
Impermissible air or gas content in the liquid.
Contact KSB.
Water level lowered too much during operation. Verify system data and sizing /
Check switching levels of the pump.
Excessive power con-
sumption
Wrong direction of rotation.
Interchange two of the phases of the power sup-
ply cable.
p
Operating voltage is too low.
Check mains voltage and cable connections.
Pump is running in the off-design range
Check the pump’s operating data.
Impeller does not turn easily.
Clean the hydraulic system.
Wear of internal pump parts.
Replace worn components by new ones.
Defective ball bearing in the motor
Contact KSB.
Vibrations and noise dur-
ing pump operation
Wrong direction of rotation.
Interchange two of the phases of the power sup-
ply cable.
g p
p p
Pump is running in the off-design range
Check the pump’s operating data.
Clogged impeller
Remove deposits in the pump.
Impeller does not turn easily.
Check whether the impeller can be easily ro-
tated; clean the hydraulic system, if required.
Wear of internal pump parts.
Replace worn components by new ones.
Impermissible air or gas content in the liquid.
Contact KSB.
System-induced vibrations
Contact KSB.
Defective ball bearing in the motor
Contact KSB.
Please note:
Please contact us before carrying out any work on the pump’s internal parts during the warranty period.
Q-Pulse Id: VM41
10/05/2011
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