Edwards EXT250 Series, Инструкция по эксплуатации, Страница: 23 / 42

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Installation
B722-01-880 Issue K
3.3 Connect to the vacuum system
3.3.1 Inlet-screen
Do not remove the inlet-screen unless you can be sure that there is no danger that debris can fall into the pump. In
order to avoid the danger of injury from the rotor blades, do not remove the inlet-screen until you are ready to mount
the pump onto your system. If the screen is removed, the pumping speed will increase by approximately 10%. It is
not possible to remove the inlet-screen from a pump with an NW inlet-flange.
To remove the inlet-screen from pumps with ISO or CF flanges, carefully extract it from the inlet-flange using a bent
wire hook. To replace a screen which has been removed, install it as shown in
Figure 7 , with the Edwards logo
uppermost. Ensure that the dimples on the rim of the screen engage in the groove in the pump flange. If necessary,
gently bend the tags of the screen outwards to ensure a tight fit.
Figure 7 - Correct installation of the inlet-screen
3.3.2 Mechanical fixing
There are two ways in which the EXT pump can be securely fixed. Ideally, the EXT pump should be securely fixed by
its inlet-flange to a rigid, firmly fixed vacuum system: see
Section 3.3.4 . If this is not possible because of the nature
of the vacuum system, the base of the EXT pump must be securely fixed to a firm support: see Section 3.3.3 .
WARNING
Install the pump in the vacuum system before you connect the EXC Controller. This will ensure that
the pump cannot operate and injure people during installation.
WARNING
Do not operate the EXT pump until it is securely fixed. If the pump seizes, the stored energy of the
rotor can cause rapid movement of the pump, which may cause damage and injury to people.
1. EXT inlet-flange
2. Inlet-screen