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The nEXT pump is supplied with an inlet screen. The inlet screen is installed in the
centering O-ring for ISO version pumps and in the envelope for CF version pumps. The
nEXT pumps with an NW25 interstage port are supplied with an inlet strainer. The inlet
strainer is installed in the interstage port. The inlet screen and inlet strainer prevent the
damage to the pump caused by debris entering the pump.
The nEXT pump has a vent port for venting the pump and vacuum system to the
atmospheric pressure. The pump has a manual vent valve which can be replaced with a
TAV5 or TAV6 solenoid‑operated vent valve (available as an accessory, refer to
Accessories
The nEXT pump has a purge port through which an inert purge gas can be introduced to
protect the bearing and motor from corrosion. You can install an optional vent port
adapter and purge restrictor to the purge port to control the flow rate of the purge gas
and to filter the gas supply. Refer to
Air coolers and a water‑cooling block are available as an optional accessory to cool the
nEXT pumps. Refer to
2.2 Pump model description
Figure 1 Pump model description
NEXT240
Pump
type
SERIAL : YYXXXXXXX
Year of manufacture
2.3 Pump controller
The pump controller has the drive electronics that control the pump operation and the
TAV vent valve. The connector socket is given at the side of the controller where the
TAV vent valve can be plugged in. Refer to
The controller has three indicator LED's which signal the general status, operation and
the service status of the pump. The LEDs can be used for fault finding if a problem
occurs. Refer to
The drive electronics system has a number of built‑in safety features to prevent
the pump from damage during sustained high pressure or temperature.
▪
The electronics constantly monitors the temperature in the controller and the
temperature of the motor in the pump. If the controller or the motor gets too hot,
B80000880_G
B80000880_G - Introduction
on page 99). The on‑board motor controller can control the TAV valve.
Accessories
I
DL
ISO100
Interstage
Mechanism
Variant
type
Indicator LED's
on page 35.
Accessories
on page 99.
on page 99.
NW25/25
Envelope
Backing port /
type
interstage port
type
Controller connector socket
Page 12
105
FPS1
Default
Customer
power
variant
setting
on page 34.
04/2022 - ©Edwards Limited
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