Troubleshooting
During troubleshooting, follow the instructions in this manual. A correct installation
is crucial to proper operation.
Before repair or service of the GMP Mixer, personnel must study and understand
the user guide.
Before performing maintenance on the GMP Mixer, make sure that the vessel is:
cooled down to below 25 °C (77 °F)•
emptied of liquid and hazardous gas•
free from traces of harmful products•
It is the customer’s responsibility to check the safety of the GMP Mixer used in a
new application according to:
External load•
Reaction forces and torque•
Corrosion, erosion, and fatigue•
Decomposing of unstable liquids•
Problem Possible Causes Solutions
Motor/mixing
head does not
rotate
No power Inspect power supply
Overload protection tripped Check the setting amp
value and the ambient tem-
perature
Heavy load of particles stuck
to the magnets
Clean the unit
High amp value Ambient temperatre too high Chill the environment
Motor mechanically over-
loaded
Check all transmissions
Mixing head
scratches against
tank plate
Male bearing worn out Replace male bearing
Female bearing holder is
damaged
Repair mixing head
Loose male bearing Remove male bearing.
Inspect male bearing and
tank plate for damage. If it
is undamaged, reinstall the
bearing and check rotation
direction of the mixing
head.
Particles stuck to the magnets Remove particles.
Deformation after welding Review instructions for
welding the tank plate and
verify tolerances using ap-
propriate gauges.
36 www.millipore.com
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