Edwards nEXT 55, Instruction Manual

Page: 11 / 116

adapter and purge restrictor to the purge port to control the flow rate of the purge gas
and to filter the gas supply. This can be used to optimise the performance of the pump,
for example with low molecular mass gases. Refer to Accessories on page 105.
A forced air-cooling kit and a water
‑
cooling block are available as optional accessories to
cool the nEXT pump. Refer to Accessories on page 105.
Note:
The units used throughout this manual conform to the SI international system of units of
measurement. Also throughout this manual, wherever flow rates are specified, the
abbreviation 'sccm' is used to mean standard cm
3
min
-1
: this is a flow of 1 cm
3
min
-1
at an
ambient temperature of 0 °C and a pressure of 1013 mbar (1.013 x 10
5
Pa).
2.2 Pump model description
Figure 1 Pump model description
2.3 Motor controller
The motor controller has the drive electronics that control the pump operation, the TAV
vent valve and the air cooler.
An auxiliary connector socket is given at the side of the motor controller where you can
plug in the TAV vent valve and the air cooler. Refer to Motor controller auxiliary
connector socket on page 29.
A USB port ( Figure: Motor controller status information , item 9) is given which is a
service port to use with our nST PC software using a standard micro
‑
USB cable. This
enables the pump to be configured, monitored and upgraded without disconnecting
from the 24
‑
48 V d.c. supply. This software is available for download from our Upgrade
website: www.upgrades.edwardsvacuum.com
07/2021 - ©Edwards Limited Page 11 B8G000880_E
B8G000880_E - Introduction