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When planning to pump hazardous substances with this pump, read the related chapters

in the Sa

fety Booklet and in these Operang Instrucons rst.

Further details can be obtained by contacng us.

2.3 Descripon

The nXDS pump is shown in Figure: nXDS scroll pump on page 11.

The nXDS pump is a dry vacuum pump as all the bearings, with their hydrocarbon

lubricant, are isolated from the vacuum space. The pump is suitable for use on vapour

handling processes and may be used for some pumping applicaons involving corrosive

substances. For informaon on pumping ammable gases, contact us.

The body of the pump includes a xed scroll and an orbing scroll. The orbing scroll is

controlled by an electric motor through an eccentric cam on the motor drive sha. The

movement of the orbing scroll, meshed with the xed scroll, forms successive crescent

shaped volumes in the pump. Gas that enters the pump through the inlet is compressed

by the movement of the orbing scroll and swept towards the centre of the xed scroll.

The compressed gas enters the exhaust port near the centre of the xed scroll and is

exhausted from the pump through the outlet.

Refer to Operang and storage condions on page 15 for details of operang condions.

2.4 Pump controller

The integral pump controller manages the supply of current to a three‑phase electric

motor in accordance with operang condions. The controller monitors power and

temperature and will protect the pump in the event of operaon under sustained high

load or under fault condions.

The controller provides the user interface (refer to Figure: nXDS scroll pump on page 11).

The pump may be operated in these modes:

▪ Manually, using the buons on the in

terface panel. Refer to Figure: Quick start

guide (manual control mode) on page 12 and Figure: User interface panel on page

▪ Remotely via serial communicaons or digital and analogue process control

(parallel), via the 15‑way D‑type logic interface connector. Refer to Logic interface

on page 11.

Page 10

A73501880_G - Introducon

Edwards nXDS15i User Manual

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