GB 03361 - Edition 02 - June 09
3/3
A 210
The pump operating principle
The back-up ball
bearings
They are dry-lubricated ball bearings.
They are never used in normal operation
, since the rotor is not in
contact with the ball bearings.
The back-up 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. For maximum life
time of the rotors, see
(
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 400
).
A distinction is made between the following speeds:
-
reduced speed (STANDBY speed)
which can be set between the
low speed value and the maximum speed.
-
nominal speed
preselected at factory.
adixen Vacuum Products - Operating instructions - ATH 500 M-MT
adixen Vacuum Products - Operating instructions - ATH 500 M-MT
