GB 03411 - Edition 04 - November 12
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A 210
The pump operating principle
The back-up ball
bearings
They are dry-lubricated ceramic ball bearings.
They are never used in normal operation, since the rotor is not in
contact with the ball bearings.
The back-up ball bearings are only used to protect the pump in
accidental air in-rushes, accidental shocks or power failure.
No maintenance
By design, the pump doesn’t include parts liable to wear and doesn’t
need preventive maintenance. However, the back-up ball bearings
used in case of accidental shut-downs have to be changed when
the controller indicates it: the percentage of landing time to be
deducted depends on the number of incidents. The maximum life
time of the rotor is described in
D 150
.
Battery free
In case of a power failure, the motor acts like a generator, supplying
enough power for the magnetic bearings.
When the rotation speed is too low, the pump shuts down and lands
on the back-up ball bearings.
Variation of the pump
rotational speed
The ATHM pump rotation speed can be selected and set between
a minimum speed and the maximum speed. This makes it possible
to optimize pumping characteristics according to each customer
application (for example, high pressure pumping).
A distinction is made between the following speeds:
-
reduced speed (STANDBY speed)
which can be set between the
low speed value and the nominal speed.
-
nominal speed
preselected at factory.
adixen Vacuum Products - Operating instructions - ATH 2300 M/MT
