A352-03-880 Issue B
Page 14 © Edwards Limited 2015. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
4. The cable gland is supplied with the motor. After the supply cable is fitted, the cable gland must be a protective
seal to the standard of IP55 in IEC 529 or better.
5. Pass the motor electrical supply cable through the cable gland.
6. Connect the cable to the terminals as shown in the wiring diagram supplied in the motor terminal box.
3.6.2 Check the direction of rotation
Ensure that the pump motor rotates in the correct direction. If it does not, the pump and the 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 fan cowl. If
the direction of rotation is incorrect:
Isolate the pump from the electrical supply.
Remove the terminal box cover and swap wires L1 and L3. Refer to the wiring diagram supplied in the motor
terminal box.
Refit the cover to the terminal box.
Connect the pump to the electrical supply.
Check the direction of rotation again.
3.7 Connect the pump inlet to the vacuum system
Connect the vacuum system to the inlet port (Figures 1, 2, and 3, item 4). Use standard fittings when connecting the
pump.
Take note of the following information when connecting the pump to the vacuum system. Refer to Section 7.4 for
details of the accessories mentioned below.
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.
Support the vacuum pipelines to prevent loading of the coupling joints.
If necessary, incorporate flexible bellows in the system pipelines to reduce the transmission of vibration and
to prevent loading of coupling joints. If using flexible bellows, ensure that the bellows have a maximum
pressure rating that is greater than the highest pressure that can be generated in the system. Flexible
bellows must be used if the pump is mounted on vibration isolators. Edwards recommends the use of Edwards
flexible bellows.
Use a suitable inlet catchpot if pumping condensable vapours or for very dusty applications.
Ensure that sealing surfaces are clean and scratch free.
Customer should leak check assembly before use.
Although the pump has a spring-activated inlet valve, if the process needs to be protected, a separate inlet
valve should be fitted.
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