© Edwards Limited 2018. All rights reserved. Page 3
Introduction
A732-01-880 Issue D
Figure 1 - XDS100B scroll booster
1.3 Description
The XDS100B Scroll Booster is shown in Figure 1. Refer to Figure 1 for item numbers in brackets in the following
descriptions.
The XDS pump is a compact, reliable vacuum pump which is suitable for use on vapour handling processes. The
XDS100B is a scroll booster, with a pumping mechanism designed specifically for high pumping speed. It cannot
exhaust directly to atmosphere, and must be backed by a primary pump; it is intended for use in conjunction with
Edwards XDS35i or XDS46i scroll pumps.
The body of the pump includes a fixed scroll and an orbiting scroll. The orbiting scroll is controlled by the electric
motor through an eccentric cam on the motor drive shaft. The movement of the orbiting scroll, meshed with the
fixed scroll, forms successive crescent shaped volumes in the pump. Gas that enters the pump through the inlet is
compressed by the movement of the orbiting scroll and swept towards the centre of the fixed scroll. The compressed
gas enters the exhaust port near the centre of the stationary scroll and is exhausted from the pump through the
outlet, which must be connected to a primary pump.
The XDS is a truly dry vacuum pump, as all the bearings, with hydrocarbon lubricant, are isolated from the vacuum
space.
The pump mechanism is driven directly by a three phase electric motor. The motor is controlled by an inverter,
which manages the supply of current to the motor in accordance with operating conditions, and allows the pump
to be connected to a single phase supply. The voltage changeover switch, beneath the voltage changeover switch
cover, (7) must be set to the correct position in accordance with the power supply being used, refer to Section 3.5.2.
1. NW40 inlet port
2. Cooling fan
3. NW40 exhaust port
4. Fan connector
5. Rubber feet
6. Electrical connector
7. Voltage changeover switch cover
8. Run/Standby switch
9. 15-way connector
10. Hour counter
11. Lifting eye
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