CAUTION: ELECTRICAL SHOCK
Contact with live parts may lead to electrical shock.
The electrical connection may only be carried out by a trained person. Observe the
national regulations in the user country, e.g. for Europe EN 50110 - 1. Prior to
servicing, disconnect the vacuum pump from the power supply.
Electrical shock due to interruption of the protective conductor system. In the event
of a fault, life-threatening voltages may be present on electrically conductive
components.
Before commissioning, check the resistance of the earthing cable and the suitability
of the assigned overcurrent protection device.
Use suitable vacuum tubing and connectors to connect the flange of the backing port to
the backing pump. If necessary, use flexible pipe or bellows to reduce the transmission
of vibration from the backing pump to the pump.
5.3 Purge gas connection
5.3.1 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
).
The flow rate of the purge gas must be limited to the allowed range. To limit the flow
rate, use a flow controller or a pressure regulator and calibrated flow restrictor. The
PRX10 purge restrictor accessory (refer to Accessories on page 123) is suitable for this
purpose.
5.3.2 Connect the purge gas
Connect a purge gas supply to protect the pump.
1. To supply a purge gas to the pump, remove the plug fitted in the purge port.
2. To fit a vent port adaptor (refer to Accessories on page 123).
3. Connect the purge gas supply to the vent port adaptor.
5.4 Electrical installation
Always make the electrical connections to the pump after the pump has been installed
on the vacuum system.
Do not remove the motor controller from the pump. There are no user-serviceable
parts.
NOTICE:
Do not use the pump with a backing pressure below 5 x 10
-4
mbar (5 x 10
-2
Pa).
Lower backing pressures will increase the evaporation rate of the lubrication reducing
the bearing life.
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