Tabla de contenido
Publicidad
Pump Description
The pump consists of a high frequency motor driv-
ing a turbine fitted with 8 bladed stages and 4
Macrotorr stages. The turbine rotates in an anti-
clockwise direction when viewed from the high
vacuum flange end.
The turbine is made of high-strength aluminium al-
loy, machined from a single block.
Proceeding from the high vacuum to the for vac-
uum region, the turbine stages sequence is:
•
1st stage with a blade angle of 40°,
•
2nd stage with a blade angle of 34°,
•
3rd stage with a blade angle of 28°,
•
4th and 5th stages with a blade angle of 24°,
•
6th stage with a blade angle of 20°,
•
7th and 8th stages with a blade angle of 16°.
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
stainless steel. These are supported and accu-
rately positioned 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 ro-
tor discs. These are made of aluminium alloy.
During normal operation, the motor is fed with a
voltage of 54 Vac three-phase at 715 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 connec-
tion of the forevacuum on the side of the pump is a
KF 25 NW flange.
Controller Description
The dedicated controller is a solid-state frequency
converter which is driven by a single chip micro-
computer and is composed of two PCBs which in-
clude power supply and 3-phase output, analog
and input/output section, microprocessor and digi-
tal section.
The power supply, together with the 3-phase out-
put, converts the single phase AC mains supply
into a 3-phase, low voltage, medium frequency
output which is required to power the pump.
The controller can be operated by a remote host
computer via the serial connection. A Windows-
based software is available (optional).
26
TECHNICAL INFORMATION
87-900-934-01(B)
Publicidad
Tabla de contenido
