B722-40-880 Issue F
Page 24 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
3.4 Purge gas connection
3.4.1 Connect the purge gas
To supply a purge gas to the pump, remove the plug fitted in the purge port, fit a vent port adaptor (refer to
Section 7.4) and connect the purge gas supply to the vent port adaptor. The purge gas must comply with the
specification given in Section 2.4.
3.4.2 Recommended purge gas flow
The recommended purge gas flow for typical applications is 25 sccm (0.42 mbar l s
-1
, 42 Pa l s
-1
). This flow will protect
the pump when pumping oxygen in concentrations above 20% by volume.
The flow rate of the purge gas must be limited to the allowed range specified in Section 2.4. To limit the flow rate,
use a flow controller or a pressure regulator and calibrated flow restrictor. The PRX10 purge restrictor accessory
(refer to Section 7.4) is suitable for this purpose. Adjust the PRX10 as described in the instruction manual supplied
with the accessory.
3.5 Electrical installation
3.5.1 Introduction
The electrical installation must be carried out by a qualified person. Always make the electrical connections to the
DX pump after the pump has been installed on the vacuum system.
Earth the pump using the connection provided and refer to Section 3.5.2.
The DX pump can be operated using the Edwards TIC Turbo Instrument Controller or TIC Turbo Controller (refer to
Section 3.5.3). The DX pump can also be controlled using the customer system. Refer to Section 3.5.4 for information
about control and to Section 3.5.5 for instructions on how to connect the electrical supply.
3.5.2 Earth (ground) connections
Edwards recommends fitting a separate earth (ground) conductor to earth the DX pump. Use an uninsulated braid or
a separate insulated green/yellow conductor, and the M5 x 10 screw and shake proof washer supplied (fitted to the
earth hole on the pump), to secure the earth conductor to the pump. The impedance between the pump body and
the earth connection point must be < 0.1 .
3.5.3 Connect the logic interface to the TIC
If an Edwards TIC Turbo Instrument Controller or TIC Turbo Controller is used to power and control the pump, the DX
pump logic interface cable connects directly into the back of the TIC. Refer to the TIC Instruction Manual for further
information.
3.5.4 Connect the logic interface to the customer control equipment
If operating the DX pump using the customer control system, use a suitable connector mating half (not supplied), to
connect the control equipment to the connector on the logic interface cable (refer to Table 9). When making the
electrical connections to the DX pump described in the following sections, refer to Table 10 for full details of the
logic interface connector pins.
Ensure that the pump is electrically bonded to earth. If it is not, the system could become
hazardous live in the event of a live conductor touching a metallic surface.
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