8
Trouble-shooting
Submersible mixer does not generate flow
Insufficient flow
Excessive current/power consumption
Vibrations and noise during mixer operation
A B C D Possible cause
Remedy
X
Unfavourable installation of submersible
mixer
Check installation – Check the flow area for obstacles
and remove.
X X Propeller covered in solids; density of fluid
handled is too high
Clean the propeller, check power data and direction
of rotation.
X
X Propeller damaged
Replace the propeller.
X X X Wrong direction of rotation.
If the mixer is running in the wrong direction of
rotation, check the electrical connection of the mixer
and the control system, if necessary.
X
Wrong supply voltage
Check mains voltage; check electrical cable
connections.
X
Motor is not running due to lack of power
supply.
Check electrical installation, inform electric utility
company.
X
Motor winding or power cable are defective. Replace with original KSB parts or contact KSB.
X Defective rolling element bearing
Contact KSB.
X X
In case of star-delta configuration:
Motor running in star configuration only.
Check star-delta contactor.
X
X Liquid level in the tank is too low.
Check level control equipment.
X
The temperature switch monitoring the
winding has tripped because of excessive
temperature rise in the winding.
Have cause determined and eliminated by trained
personnel.
X
Motor has been tripped by leakage monitor.
Have cause determined and eliminated by trained
personnel.
X
Mechanical seal monitor has tripped.
Have cause determined and eliminated by trained
personnel.
A
B
C
D
8 Trouble-shooting
44 of 60
Amaprop®
Goodnal STP ST041 Biological Treatment (KSB Amaprop Installation and Operating Manual) Vendor Manual
Q-Pulse Id VM386
Active 29/10/2013
Page 44 of 60
