B800-00-880 Issue A
Page 2 © Edwards Limited 2009. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
1.2 General description
Do not attempt to separate the Controller from the pump since this will cause damage to the electrical
connections.
The nEXT pumps consist of the turbomolecular pump with a permanently attached controller containing drive
electronics.
The controller controls the electrical supply to the pump with the exception of standby speed control. It has no
manual controls and can only be operated through the logic interface. To operate the nEXT pump you must connect
it to your own control equipment and power supply or alternatively use the Edwards TIC Turbo Instrument Controller
or TIC Turbo Controller.
The controller drives the brush-less d.c. motor in the pump.
There are three main variants of the nEXT pump,
The “S” or “Simplex” variant contains only turbomolecular blades.
The “D” or “Duplex” variant contains turbomolecular blades and a Siegbahn drag mechanism allowing
operation at higher backing pressures than pure turbomolecular pumps.
The “T” or “Triplex” variant contains turbomolecular blades, a Siegbahn drag mechanism and a regenerative
mechanism. The regenerative stage offers the option to utilise “boost” mode.
Also available is an “iD” or “iT” interstage variant, which provides an interstage port between the turbomolecular
blades and Siegbahn drag mechanism.
nEXT pumps are supplied with an inlet-screen fitted into the centering O-ring for ISO version pumps and into envelope
for CF version pumps. nEXT pumps with an NW25 interstage port are supplied with an inlet-strainer that fits into the
interstage-port. The inletscreen and inlet-strainer protect the pump against damage that would be caused by debris
entering the pump.
The nEXT pumps have a vent-port for venting the pump and vacuum system to atmospheric pressure. The pump is
supplied with a manual vent-valve fitted; this can be replaced with a TAV5 or TAV6 solenoid-operated vent-valve
(available as accessories – see Section 7). The TAV valve can be directly controlled by the on-board controller.
The nEXT pumps have a purge-port: an inert purge gas can be introduced to protect the bearing and motor from
corrosion. An optional vent-port adapter and purge restrictor can be fitted to the purge-port to control the flow rate
of the purge gas and to filter the gas supply. (Refer to Section 7).
Air-coolers and a water-cooling block are available as optional accessories to cool the nEXTpumps. (Refer to
Section 7).
Improper use of the equipment could cause damage to it or injury to people. The user is
responsible for the safe operation, installation and monitoring of the system.
The Drive contains electrolytic capacitors and, under certain fault conditions, may emit dangerous
fumes. Ensure that the Drive is operated in a well-ventilated area.
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