Edwards iF1800 User Manual

© Edwards Limited 2009. All rights reserved. Page 3
Edwards and the Edwards logo are trademarks of Edwards Limited.
INTRODUCTION
A533-23-880 Issue C
Both the FDP and HMB pumps have enclosed, water-cooled motors. The iF system is therefore suitable for
applications in clean environments where fan cooling of motors is unacceptable.
The iF system has a gas system which introduces purge gas into the FDP pump.
You can manually control the iF system through the Pump Display Terminal: refer to Section 1.11. Alternatively, you
can use your process tool or other control equipment to control the operation of the iF system through an Interface
Module accessory (refer to Section 8.5.2), or through an iF Communications Module accessory (refer to Section 8.5.1),
or you can use the iF Single Pumpset Monitor accessory to control the operation of the iF system (refer to Section
8.5.3). The remainder of this manual describes the use of the Pump Display Terminal to operate the iF system: for
use of another accessory to operate the iF system, refer to the instruction manual supplied with the accessory.
The components of the iF system are described in the following sections.
1.3 Safety
All of the components of the iF system are fitted inside an enclosure. Panels of the enclosure should only be removed
for access during maintenance and should at no time be removed by the operator. Potential hazards on the iF system
include electricity, hot surfaces, process chemicals, Fomblin oil and nitrogen and water under pressure. Detailed
safety information is given in Section 3.1 (Installation), Section 6.1 (maintenance) and Edwards publication number
P300-20-000 ‘Vacuum pump and vacuum system safety’.
1.4 The FDP dry pump
The FDP pump is a positive displacement rotary pump in which a pair of matched screw rotors forms, with the casing,
a transference space for gas. These rotors, which rotate without metal-to-metal contact are held in correct phase
relation by a pair of timing gears. These timing gears and the adjacent bearings are oil lubricated. The bearings at
the other end of the shaft are PFPE grease lubricated.
1.5 The FDP gas system
The gas system can be preset to operate in one of two configurations, low gas and high gas. As supplied, the gas
system is preset to high gas configuration. To change the gas system configuration, refer to Section 5.2.
The gas system has supply pipelines and components (such as valves), a Gas Module with a distribution manifold, gas
purge controls and sensors, and pipelines which deliver purge nitrogen to the purge points on the FDP pump.
The gas system provides the following purge flows to the FDP pump:
 Shaft-seals purge: this purge flow is on whenever the FDP pump is on.
 Cooling purge: this purge flow is on whenever the FDP pump is on.
 Dilution purge: this purge flow is on whenever the FDP pump is on.
 Exhaust-purge: this purge flow is only used in high gas configuration. The purge flow is on whenever the FDP
pump is on.
 Inlet-purge: this purge flow is only used in high gas configuration. The purge flow can be switched on or off
by use of the Pump Display Terminal or by your own control equipment.
Refer to Figure 2 which shows a schematic diagram of the FDP gas system.
The purge flow pressure is controlled by a pressure regulator (24). A mass flow transducer (23) measures the total
flow of purge gas to the pump purge points. A check-valve (27) prevents the flow of process gases back into your
nitrogen supply pipeline.
The dilution purge flow is switched on and off by the solenoid-valve (15). The inlet-purge, shaft-seals purge and
exhaust-purge flows are switched on and off by the solenoid-valves (20, 17 and 22). The dilution / cooling purge
solenoid-valve (19) operates in conjunction with the dilution and inlet purge solenoid-valves (15 and 20), to control

Edwards iF1800 Specifications

General

Brand	Edwards
Model	iF1800
Category	Water Pump
Language	English