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A 210
The pump operating principle
GB 02918 - Edition 03 - 03/2013
The back-up ball
bearings
No maintenance
Battery free
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.
By design, the pump doesn’t include parts liable to wear and
doesn’t need preventive maintenance. However, the back-up
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 (
D 150
).
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.
The ATPM 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
: maximum speed preselected at factory.
Variation of the pump
rotational speed
adixen Vacuum Products - Operating Instructions - ATP 2300 M
