Check The Direction Of Rotation; Inlet And Outlet Connections - Edwards RV3 Instruction Manual

A652–01–880 Issue S
3.8.3

Check the direction of rotation

Ensure that the pump-motor rotates in the correct direction. If it does not, the pump and your vacuum system
can become pressurised.
1. Refer to Figure 1. Watch the motor cooling-fan through the motor fan-cover (13).
2. Switch-on the electrical supply to the motor for a few seconds.
3. Check that the motor cooling-fan rotates in the correct direction shown by the arrow on the motor mounting
plate. If the direction of rotation is incorrect:
Switch off the electrical supply immediately.
Isolate the pump from the electrical supply.
Remove the terminal-box cover and swap wires L1 and L3: see Figures
Refit the cover to the terminal-box.
3.9

Inlet and outlet connections

Connect the exhaust to a suitable treatment plant to prevent the discharge of dangerous gases and
vapours to the surrounding atmosphere. Use a catchpot to prevent the drainage of contaminated
condensate back into the pump.
Before you connect the pump to your vacuum system, fit the centring-ring and inlet-filter (supplied with the pump)
to the pump inlet-port (see
Take note of the following information when you connect the pump to your vacuum system. Refer to
details of the accessories mentioned below. Use standard NW25 fittings (not supplied) when you connect the pump.
For optimum pumping speeds, ensure that the pipeline connected to the pump-inlet is as short as possible
and has an internal diameter of 25 mm or larger.
Support the vacuum pipelines to prevent loading of the coupling-joints.
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. We recommend that you use Edwards flexible bellows.
Use a suitable inlet trap if you pump condensable vapours or if you use the pump for very dusty applications.
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.
Ensure that sealing surfaces are clean and scratch-free.
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CAUTION
WARNING
Figure 5).
Edwards and the Edwards logo are trade marks of Edwards Limited.
5 and 6.
© Edwards Limited 2007. All rights reserved.
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