A726-01-880 Issue M
Page 18 © Edwards Limited 2010. All rights reserved.
Edwards and Edwards logo are trademarks of Edwards Limited.
Installation
Note: The following instructions refer to connecting a cable to the terminal block within the terminal box. If the
unit is already fitted with a cable, please ignore these instructions but retain them in the event the cable
ever needs replacement. It is still necessary to check the direction of rotation.
The diameter of the electrical supply cable should be in the range 7 to 11 mm. The cable must conform in size and
colour coding with your local and national electrical installation regulations.
1. Pass the electrical supply cable through the cable-gland and out of the access hole.
2. Use insulated crimped connectors to connect the wires in the cable to the terminals U1, V1, W1 and earth in the
terminal-box as shown in Figures 6 and 7. Ensure connections are made using plain washer, spring washer and
nut, in that order.
3. Refit the access plate.
4. Tighten the strain-relief nut on the cable-gland.
3.7.3 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. Unscrew the 3 retaining screws and remove the plastic cover in the centre of the motor back plate.
2. Switch on the electrical supply to the motor for a few seconds.
3. Check that the screw on the back of the motor rotates in the correct direction, shown by the arrow on the
motor.
4. If the direction of rotation is incorrect, switch off the electrical supply and isolate the pump from the electrical
supply. Disassemble the plug and switch the positions of the black wires.
3.8 Inlet and outlet connections
Before you connect the pump to your vacuum system, fit the centring ring and inlet strainer (supplied with the pump)
to the pump inlet port. Ensure that debris does not get into your pump when you install it.
Take note of the following information when you connect the pump to your vacuum system. Refer to Section 7 for
details of the accessories mentioned below. Use standard DN25NW fittings (not supplied) when you connect the
pump.
For maximum 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 pipeline to prevent loading of the coupling joints.
If necessary, incorporate flexible pipeline in your system to reduce the transmission of vibration and to
prevent loading of the 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.
Connect the exhaust to a suitable treatment plant to prevent the discharge of dangerous gases and
vapours to the surrounding atmosphere.
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