A735-01-880 Issue C
Page 18 © Edwards Limited 2017. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
Take note of the following information when connecting the pump to the vacuum system:
To minimise noise and exhaust emissions, it is recommended that the pump is connected to an exhaust line
or a silencer (refer to Section 7).
For optimum pumping speeds, ensure that the pipeline connected to the pump inlet is as short as possible
and has a suitable internal diameter.
Support the vacuum pipeline to prevent loading of the coupling joints.
A pressure of 3 barg may be generated in the exhaust pipework if the pump is operated with the exhaust line
blocked. Connect the pump using appropriate pipework and fittings.
If necessary, incorporate flexible bellows in the system pipelines to reduce the transmission of vibration and
to prevent loading of the coupling joints. If using flexible bellows, ensure that bellows have a maximum
pressure rating which is greater than the highest pressure that can be generated in the system. Edwards
bellows are recommended.
Incorporate an inlet isolation valve in the pipeline from the vacuum system to the pump to isolate the
vacuum system from the pump when it is switched off and prevent suck-back of process gases and debris into
the vacuum system.
Ensure that the sealing surfaces are clean and scratch-free.
Edwards recommends using an exhaust extraction system suitable for use with all process gases that will be pumped.
Ensure that the exhaust extraction system cannot become blocked or obstructed when the pump is operating.
A small amount of tip seal wear product may collect in the exhaust duct of the pump. The dust may be blown out
with the initial burst of air after the pump has been vented. This is quite common and the amount of dust seen will
reduce over time.
Leak test the system and seal any leaks found after pump installation.
3.6 Electrical installation
3.6.1 Fuses and circuit breakers
Ensure that access to the pump electrical supply cable is not obstructed when locating the pump.
If an overload circuit breaker is used, ensure that is a time lag type.
If using an earth leakage device, for example, a Residual Current Device (RCD), use a 30 mA (minimum) rated
unit to avoid trip during start up.
The live conductor is fused inside the pump controller whilst the neutral conductor is not. An external RCD
should be installed to guard against damage in the event of a short circuit between neutral and earth.
For recommended fuse ratings, refer to Table 9 in Section 2.4.
Ensure that the electrical installation of the pump conforms to local and national safety
requirements. The pump must be connected to a suitably fused and protected electrical supply
with a suitable earth point.
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