Edwards XDS46i

3. Switch on the electrical supply to the pump, using the Run/Standby switch Figure:
General view on page 9, item 9.
4. With manual operaon always use the Run/Standby switch to start/stop the pump.
If remote operaon is used to control the pump, refer to Remote operaon using
15-way D connector on page 23.
5. Open the vacuum system isolaon valve (if ed).
5.3 To achieve ulmate vacuum (if gas ballast ed)
In order to achieve the best possible vacuum, the pump should be operated with the gas
ballast control on posion '0'. However, if the pump, or elements of the vacuum system
it is aached to, are new or have been newly ed, some atmospheric moisture may be
present. If atmospheric moisture is present, run the pump with the gas ballast control in
posion 'I' or 'II' for 20 minutes before switching to posion '0'. If moisture is allowed to
remain, the performance of the pump will be impaired.
5.4 To pump condensable vapours (if gas ballast ed)
Select a suitable gas ballast seng (gas ballast control in posion 'I' or 'II') when there is
a high proporon of condensable vapours in the process gases. This will assist the
vapours to pass through the pump without condensing and keep the pump performance
from degrading.
5.5 Implicaon of ATEX direcve
5.5.1 Flammable/pyrophoric materials
When ammable or pyrophoric materials are present within the equipment:
▪
Do not allow air to enter the equipment.
▪
Ensure the system is leak ght.
▪ Dilute any ammable gases or vapours by using an inert purge, for example
nitrogen, to the pump inlet and gas ballast (if ed) to reduce the concentraon of
ammable gases or vapours in the pump and exhaust line to less than one quarter
of the published Lower Explosive Limits (LEL).
▪ Prevent the condensaon of ammable vapours within the pump mechanism and
exhaust line by using an inert gas purge to the pump gas ballast connecon.
5.5.2 Gas purges
WARNING:
If nitrogen purges are used to dilute dangerous gases to safe levels, ensure that the
system shuts down if the nitrogen supply to the pump fails.
The following acons must be taken to ensure that the gas being pumped stays out of
the ammable range:
▪
The inert gas purge should be switched on to remove air from the pump and
exhaust before the process starts. The purge ow can be switched o at the end of
Page 22
A73101880_F - Operaon