Agilent Technologies TV 301 Mode D'emploi page 224

17 Technical Information
Description of the TV 301 Navigator
Proceeding from the high vacuum to the forevacuum region, the
turbine stages sequence is:





The Macrotorr stages are in the form of four discs.
The turbine rotor is supported by permanently lu-bricated high
precision ceramic ball bearings in-stalled on the forevacuum side of
the pump.
The static blades of the stator are made of stain-less steel. These are
supported and accurately po-sitioned by spacer rings.
The Macrotorr stators are in the form of self-positioning machined
discs with pumping channels and an opening restricted by the
corresponding rotor discs. These are made of aluminium alloy.
During normal operation, the motor is fed with a voltage of 54 Vac
three-phase at 933 Hz. To re-duce losses during start-up to a
minimum, the fre-quency increases according to a ramp with a higher
initial voltage/frequency ratio.
The pump can be water cooled or air cooled: in the first case the
customer can use the dedicated channels on the pump body, in the
second case an external optional fan is available.
A thermistor sensor is mounted near the upper bearing to prevent
the pump from overheating.
The pump is balanced after assembly with a resid-ual vibration
amplitude less than 0.01 µm.
The pump can operate in any position and can be supported on the
high vacuum flange. The connection of the forevacuum on the side of
the pump is a KF 16 NW flange (KF25 – optional).
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1st stage with a blade angle of 42°,
2nd stage with a blade angle of 28°,
3rd stage with a blade angle of 24°,
4th and 5th stages with a blade angle of 20°,
6th, 7th and 8th stages with a blade angle of 10°.
TV 301 Navigator User Manual / 87-900-946-01 (N)