The fan requires a 48 VDC external power supply.
The 48 VDC power supply proposed by the manufacturer supplies the pump and the fan.
► Tighten the 2 screws onto the fan holder.
► Wire up the fan in accordance with the marking of terminals and wires (see chapter “Connection
to external supply”).
5.6 Nitrogen circuit connection
Depending on the application, the inert gas purge can consist of:
● Injecting ambient air, or
● Injecting an inert gas into the pump.
In this manual, the inert gas will be called 'nitrogen', as it is the most commonly used gas. For more
information on the type of purge gas, contact our service center.
DANGER
Danger of death by explosion when pumping gases containing pyrophoric/flammable materi-
als
There is a risk of explosion if pyrophoric materials above the LEL are sent to the pump.
► Ensure there is a sufficient flow of nitrogen to lower the concentration below the LEL.
► Provide an interlock to ensure that gas flow towards the pump is stopped if the nitrogen flow is
interrupted.
WARNING
Risk of injury in case of contact with pressurized nitrogen
The product uses pressurized nitrogen as a flushing gas. Non-compliant installations or installations
not done to professional standards may endanger the user’s life.
► Install a manual valve on the circuit at a distance of 3 m from the product, so that the nitrogen
supply can be locked out.
► Observe the recommended supply pressure.
► Always lock out and disconnect the nitrogen circuit before working on the product.
► When carrying out maintenance, secure the installation properly by locating and locking out the
pressurized nitrogen circuit to prevent it from being re-engaged by accident (LO/TO Lock
Out/Tag Out procedure).
► Regularly check the condition of the pipework and supply circuit connections.
A filtered dry nitrogen supply with the given characteristics is required for optimum perform-
ance
(see chapter "Nitrogen characteristics").
5.6.1 Inert gas purge
NOTICE
Inert gas purge function
When the inert gas purge is stopped, the pumped gases can pass from the fore vacuum side to the
high vacuum side and damage the bearing housings.
► Maintain the inert gas purge flow as long as the rotor is running to prolong the flushing.
► The purge maximum pressure must not exceed 1 · 10
3
to 1.5 · 10
3
hPa (absolute).
Installation
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