© Edwards Limited 2009. All rights reserved. Page iii
Edwards and the Edwards logo are trademarks of Edwards Limited.
Contents
B800-00-880 Issue A
5.4 Clean the external surfaces of the pump ...........................................................................60
5.5 Fault finding .............................................................................................................60
5.5.1 Flashing Service Codes .................................................................................................63
5.5.2 Flashing error codes ....................................................................................................63
5.5.3 Decoding system status words ........................................................................................64
5.5.4 Useful service information ............................................................................................66
6 Storage and disposal ........................................................................... 67
6.1 Storage ...................................................................................................................67
6.2 Disposal ...................................................................................................................67
7 Service, spares and accessories .............................................................. 69
7.1 Introduction .............................................................................................................69
7.2 Service ....................................................................................................................69
7.2.1 Returning a pump for service .........................................................................................69
7.2.2 Bearing and oil cartridge on-site maintenance ....................................................................69
7.3 Spares .....................................................................................................................70
7.3.1 ISX inlet-screen ......................................................................................................... 70
7.3.2 Inlet-strainer ............................................................................................................70
7.3.3 Inlet-flange seals and integrated inlet screens ....................................................................70
7.4 Accessories ...............................................................................................................70
7.4.1 Installation ...............................................................................................................70
7.4.2 ACX air-cooler ........................................................................................................... 70
7.4.3 WCX water-cooler ......................................................................................................71
7.4.4 BX bakeout band ........................................................................................................71
7.4.5 TAV vent-valve and vent-port adaptor ..............................................................................71
7.4.6 VRX vent-restrictor .....................................................................................................71
7.4.7 Vent-port adaptor ......................................................................................................72
7.4.8 PRX purge-restrictor ....................................................................................................72
Index .............................................................................................. 75
For return of equipment, complete the HS Forms at the end of this manual.
Illustrations
Figure Page
1 nEXT240 Performance Curve ..........................................................................................12
2 nEXT300 Performacne Curve ..........................................................................................12
3 nEXT 240D dimensions (mm) ..........................................................................................14
4 nEXT 300D dimensions (mm) ..........................................................................................15
5 nEXT 400D dimensions (mm) .........................................................................................16
6 Maximum allowed rate of pressure rise during venting: pressure against time (with pump initially at full
rotational speed) 17
7 Controller Connector showing pin numbers ........................................................................21
8 Interface circuits for nEXT turbo pump controllers ...............................................................22
9 Typical pumping system with a nEXT pump ........................................................................26
10 Logic interface connections - parallel mode .......................................................................31
11 Controller status information .........................................................................................33
16 Schematic diagram of the logic interface connections ...........................................................39
17 Maximum relative humidity to avoid condensation with water cooling ........................................43
18 nEXT exploded accessories view ..................................................................................... 73
19 nEXT exploded accessories view ..................................................................................... 74
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