© Edwards Limited 2007. All rights reserved.
Page 17
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Installation
A344-02-880 Issue J
3.7.2
Check the direction of rotation
CAUTION
Ensure that the pump-motor rotates in the correct direction. If it does not, the pump and your vacuum system
can become pressurised.
1. Watch the motor cooling-fan through the motor fan-cover.
2. Switch-on the electrical supply to the motor for a few seconds and switch off.
3. Check that the motor cooling-fan rotates in the direction shown by the arrow on the motor mounting-plate. If
the direction of rotation is incorrect:
z
Isolate the pump from the electrical supply
z
Remove the terminal-box cover and swap wires L1 and L3 (see Figures
).
z
Refit the cover to the terminal-box
z
Connect the pump to the electrical supply
z
Check the direction of rotation again.
3.8
Connect the pump inlet to your system
3.8.1
General information
Take note of the following information when you connect the pump to your vacuum system Refer to
for
details of the accessories mentioned below.
z
For optimum pumping speeds, ensure that the pipeline connected to the inlet-port is as short as possible and
has an internal diameter not less than the inlet-port diameter.
z
Support the vacuum pipelines to prevent loading of the coupling-joints.
z
If necessary, incorporate flexible bellows in your system pipelines to reduce the transmission of vibration and
to prevent loading of coupling-joints. If you use flexible bellows, you must ensure that you use bellows which
have a maximum pressure rating which is greater than the highest pressure that can be generated in your
system. You must use flexible bellows if your pump is mounted on vibration isolators. We recommend that
you use Edwards flexible bellows.
z
Use a suitable valve to isolate the pump from your vacuum system if you need to pump condensable vapours
or maintain vacuum when the pump is switched off.
z
Use a suitable inlet catchpot if you pump condensable vapours or if you use the pump for very dusty
applications.
z
Ensure that sealing surfaces are clean and scratch-free.
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