Edwards xds35i, Instruction Manual, Page: 23 / 40

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A730-01-880 Issue E
If liquids that produce flammable vapours could be present in the pump foreline then the inert gas purge to the
XDS35i should be left on all the time this liquid is present. Flammable liquids could be present in the foreline as a
result of condensation or may be carried over from the process.
When calculating the flow rate of inert gas required for dilution, consider the maximum flow rate for the flammable
gases/vapours that could occur. For example, if a mass flow controller is being used to supply flammable gases to
the process, you should assume a flow rate for flammable gases that could arise if the mass flow controller is fully
open. The inert gas purge flow rate should be continually measured and if the flow rate falls below that required,
then the flow of flammable gases or vapours to the pump must be stopped.
We recommend you obtain and read Vacuum Pump and Vacuum System Safety publication no P300-20-000
available from Edwards or your supplier.
4.6 Remote operation using 15 way D connector
It is possible to operate the pump remotely using the 15 way D type connector fitted on the panel at the side of the
pump. (Refer to
Figure 1 ).
The 15 way D connector is insulated to ensure that it remains protected in the event of a single fault condition.
The controls available are as follows:
z
On/Off
z
Boost (Run pump at 116%)
z
Idle (Run pump at 67%)
z
Run (Runs pump at standard speed 100%)
z
OK Signal
Figure 4 shows which connections to make to enable these functions.
The power On/Off switch ( Figure 1 , item 9) should be in the Off position for remote operation.
To completely remove electrical power from the pump, the plug should be removed from the electrical connector
(
Figure 1 , item 7).
4.7 Shut down
Use the procedure below to shut down the pump:
1. If shutting the pump down prior to a period of storage, remove any process gases by running on high flow gas-
ballast for at least one hour.
2. Close any vacuum system isolation valve to prevent suckback into the vacuum system (where fitted).
3. Switch off the pump. When the pump is switched off the fan will continue to run for 1 minute.
4. Vent the XDS35i by the gas ballast control or valve on the inlet.
WARNING
If you use the nitrogen purges to dilute dangerous gases to a safe level, ensure that the system
shuts down if the nitrogen supply to the XDS35i fails.